Workshop Department of Physics, University of Ulsan … · Workshop Department of Physics, University of ... Interdisciplinary Research at Strasbourg Institute of Physics and Chemistry

Workshop

Department of Physics, University of

Ulsan– IPCMS

October 9th 2017

000

LIA Franco-Coréen Functional nanostructures : morphology, nanoelectronics and ultrafast optics

PROGRAM

Monday, October 9th

9h00-9h30

S. Haacke

Welcome and general presentation of IPCMS

9h30-10h00

S.C. Hong

Accomplishment for the last 8 years at Energy Harvest-Storage Research Center of University of

Ulsan

10h00-10h30

A. Dinia

Functionalized this films oxides for photon conversion and photovoltaic solar cells

10h30-11h00 Break

11h00-11h30

Y.H. Shin

Computational evaluations of energy-harvesting and energy-storing nanocomposite materials

11h30-12h00

M. Boero

Simple but efficient method for inhibiting sintering of catalytic Pt nano-clusters on metal-oxide

support

12h00-13h30 Lunch

13h30-14h00

L. Limot

Molecular spin coupling at the tip of a STM

14h00-14h30

J. Kim

STM study on the layered chalcogenide materials

14h30-15h00

B. Donnio

Ligand-Directed Self-Assembly Of Nanoparticles

15h00-15h30

S.L. Cho

2D SnSe single crystal for thermoelectric applications

15h30-16h00 Break

16h00-16h30

F. Banhart

In-situ electron microscopy at high spatial and temporal resolution

16h30-17h00

Y.S. Kim

Monolayer transition metal dichalcogenides growth and its applications

17h00-17h30

S. Berciaud

Optical spectroscopy of heterostructures made from graphene

and related two-dimensional materials

October 10th

2017

Visit of IPCMS

October 11th

2017

9h00-12h00

Discussions

Prof. Stefan Haacke

University of Strasbourg

Institut de Physique et Chimie des Matériaux de Strasbourg, UMR 7504,

67000 Strasbourg, France

E-mail: [email protected]

Homepage: http://www.ipcms.unistra.fr/?page_id=6777&lang=en

Telephone: +33-3-88-10-71-71

Experience

2013.01- 2017.12 Director, IPCMS

2004.09 - present Professor, University of Strasbourg

1999.09-2004.08 Assistant Professor, University & Swiss Fed. Inst. of Technology

Lausanne

1994.02 – 1999.08 Research Assistant, Swiss Fed. Inst. of Technology Lausanne

Education

1990.09-1994.01 Ph.D., J. Fourier University Grenoble (France)

1988.09-1990.07 M.S., Physics; Technical University Berlin

1986.09-1988.07 B.S., J. Fourier University Grenoble (France)

Research Topics

1. Instrumentation for ultrafast spectroscopy

2. Primary photochemical processes in retinal proteins and biomimetic systems

3. Ultrafast photophysics of molecles and nanostructures for energy conversion

Selected Publications

1. Full account on http://www.researcherid.com/rid/B-5554-2013

2. "Simultaneously enhancing dissociation and suppressing recombination in perovskite solar

cells", P.-Y. Lin, T. Wu, M. Ahmadi, Li Liu, S. Haacke, T.-F. Guo, Bin Hu, Nano Energy (2017),

36, 95-101.

3. "A new record excited state 3MLCT lifetime for metalorganic Fe(II) complexes", L. Liu, T.

Duchanois, T. Etienne, A. Monari, M. Beley, X. Assfeld, S. Haacke, P.C. Gros, Phys. Chem.

Chem. Phys., 18, 12550 (2016)

4. "Controlling Charge Separation and Recombination by Chemical Design in Donor-Acceptor

Dyads", L. Liu, P. Eisenbrandt, T. Roland, M. Polkehn, P.-O. Schwartz, A. Ruff, S. Ludwigs, N.

Leclerc, E. Zaborova, J. Léonard, S. Méry, I. Burghardt, S. Haacke, Phys. Chem. Chem. Phys.,

18, 18536 - 18548 (2016);

5. "2 MHz tunable non collinear optical parametric amplifiers with pulse durations down to 6 fs",

J. Nillon, O. Crégut, C. Bressler and S. Haacke, Optics Express, 22, 14964-14974 (2014).

6. “Probing the Ultrafast Charge Translocation of Photoexcited Retinal in Bacteriorhodopsin”, S.

Schenkl, F.van Mourik, G. van der Zwan, S. Haacke, M. Chergui, Science, 2005, 309, 917-921.

Interdisciplinary Research at Strasbourg Institute of Physics and Chemistry of

Materials

Stefan Haacke

Director Strasbourg Institute of Physics and Chemistry of Materials (IPCMS)


The Strasbourg Institute of Physics and Chemistry of Materials (IPCMS, [1]) is an

interdisciplinary research centre, with a total staff of 230 people, jointly run by the CNRS and the

University of Strasbourg. IPCMS brings together physicists and chemists, whose core of research

is on the design of molecules, inorganic solids, nanostructures and thin films, and the

investigation of these materials from the nano- to the macroscale, with particular attention to their

functional properties and/or new fundamental science they may exhibit.

The scientific priorities and international recognition of IPCMS lie in the areas of i) the

controlled design of molecular edifices & nanostructures including their self-organisation, ii)

nano-magnetism & magneto-electric coupling, iii) spintronics and nano-electronics, iv) ultrafast

processes in condensed matter, v) electron and scanning tunnneling microscopy, and vi) new

nanomaterials for health & energy conversion applications. Strongly interlaced with notorious

national and international partners from academia and industry, our strategy over the last years

was to strengthen our position as an internationnally renowned institute for interdisciplinay

nanoscience covering fundamental and applicative research for innovations in communication

technologies, health and energy.

The recent French excellence initiative PIA has brought three new priority programs to IPCMS,

since the institute is in charge of the excellence cluster Labex NIE, and is laureate of the two

Equipex projects UNION (in coll. with ISIS) and UTEM.

[1] http://www.ipcms.unistra.fr/?lang=en

http://www.ipcms.unistra.fr/?lang=en

Prof. Soon Cheol Hong

Computational Physics Laboratory

Department of Physics, University of Ulsan

93 Daehak-ro, Nam-gu, Ulsan 44610, Republic of Korea


Telephone: +82-52-259-23231

Experience

2017.01-present Editor-in-Chief, Physics & High Technology (published by the Korean

Physical Society)

2009.09-present Director, Energy Harvest-Storage Research Center, University of Ulsan

1982.03-present Professor, University of Ulsan

1979.03-1982.02 Researcher, Korea Institute of Machinery and Metals

2015.01-2016.12 Editor-in-Chief, Journal of Magnetics (published by the Korean

Magnetic Society

Education

1988. 08 Ph.D., Northwestern University

1979. 02 M.S., KAIST

1977.02 B.S., Pusan National University

Research Topics

Surface magnetism, magnetostriction, and magnetocrystalline anisotropy using first principle

calculation


1. S. W. Han, Y. H. Hwang, S.-H. Kim, W. S. Yun, J. D. Lee, M. G. Park, S. Ryu, J. S. Park,

D.-H. Yoo, S.-P. Yoon, S. C. Hong, K. S. Kim, and Y. S. Park, "Controlling Ferromagnetic

Easy Axis in a Layered MoS2 Single Crystal", Phys. Rev. Lett. 110, 247201 (2013). Cited 53

times.

2. W. S. Yun, S. W. Han, S. C. Hong, I. G. Kim, and J. D. Lee, "Thickness and strain effects on

electronic structures of transition metal dichalcogenides: 2H-MX2 semiconductors (M = Mo,

W; X = S, Se, Te) ", Phys. Rev. B 85, 033305 (2012). Cited 498 times

3. S. C. Hong, A. J. Freeman, and C. L. Fu, "Structural, electronic, and magnetic properties of

clean and Ag-covered Fe monolayers on W (110)", Phys. Rev. B 38, 12156 (1988). Cited

105 times.

4. S. C. Hong, J. I. Lee, and R. Wu, "Ferromagnetism in Pd thin films induced by quantum well

states", Phys. Rev. B 75, 172402(2007). Cited 40 times

Awards

2001 The Year Professor of University of Ulsan

2007 Research Excellency Award given by Korean Magnetic Society

2015 Changsung Award given by Korean Magnetic Society

Accomplishment for the last 8 years at Energy Harvest-Storage Research

Center of University of Ulsan

Soon Cheol Hong

Energy Harvest-Storage Research Center and Department of Physics, University of Ulsan

In this presentation I will introduce Energy Harvest-Storage Research Center, focusing on what we have

accomplished for the last 8 years. The center has been supported since 2009 by Ministry of Education of

Korea. Our main research interests are search for desirable renewable energy materials of solar cell,

thermoelectricity, piezoelectricity, and magnetostriction.

Prof. Aziz Dinia

Institut de Chimie et Physique des Matériaux de Strasbourg

University of Strasbourg and CNRS UMR 7504, 23 Rue du Loess,

F-67034 Strasbourg, France


Homepage: http://www.ipcms.unistra.fr/?page_id=11090

Telephone: +33-3-88107067

Experience

2004-present

1999.09-present

Head of Materials Sciences Master at the University of Strasbourg

Professor, ECPM, University of Strasbourg

1989.09-1999.08 Assistant Professor, University of Strasbourg

1988.11-1989.08 Postdoc, University of Rennes

Education

1984.09-1987.07 Ph.D., University of Grenoble

1983.09-1984.08 M.S. University of Grenoble

Research Topics

1. Thin films oxides for photon conversion and photovoltaic applications

2. Thin films and low dimensional systems for spintronic

Selected Publications 1. Structural, Optical and Electrical properties of Nd-doped SnO2 thin films for solar cell devices;

Solar Energy Materials and Solar Cells.145, 134–141R (2016).

2. Efficient energy transfer from ZnO to Nd3+

ions in Nd-doped ZnO films. J. Mater. Chem. C 43,

9182 (2014).).

3. Insight into photon conversion of Nd3+ doped low temperature grown p and n type tin oxide thin

films, RSC Advances, 6, 67157 (2016).

Functionalized this films oxides for photon conversion and photovoltaic solar

cells

M. Balestrieria, K. Bouras

b, K. Yassaroglu

a, G. Schmerber

a, Gérald Ferblantier

b, Silviu Colis

a, J.

L. Rehspringera, Thomas Fix

b, Abdelilah Slaoui

b and Aziz Dinia

a,

a University of Strasbourg, Institut de Physique et Chimie des Matériaux de Strasbourg

(IPCMS),CNRS UMR 7504, 23 rue du Loess, F-67034 Strasbourg, France b University of Strasbourg, ICube, CNRS UMR 7357, 23 rue du Loess, BP 20 CR, 67037

Strasbourg Cedex 2, France

The synthesis of functional high-quality oxide thin films is a major current research challenge

given their potential applications in electronic (flat panel displays, flexible electronics) and

optoelectronic (LEDs, photovoltaic) sectors. In particular, transparent conducting oxides (TCOs)

are of great interest for solar cells.

Herein, we first report on fabrication and characterization of rare earth (RE) doped TCOs such as

ZnO, SnOx or CeOx. The structural, optical and electrical properties of such functionalized

oxides will be thoroughly presented. An efficient energy transfer from the RE ions to the host

matrix will be presented. The down shifting process will be demonstrated through the conversion

of UV photons to infrared ones, which is favorable for reducing the thermalization losses in solar

cells.

In a second part, we will quickly report on some alternative materials for solar cells. First the

synthesis of a new class of ferroelectric oxide films that has high photons absorption and a

moderate bandgap, making them very suitable for photovoltaic applications. Second on halide

perovskite, CH3NH3PbI3, that emerged as a light harvester. The power-conversion efficiency of

halide perovskite solar cells has soared up to 22.1%[1]

earlier this year.

Prof. Young-Han Shin

Multiscale Materials Modeling Lab.




Homepage: http://may.ulsan.ac.kr/M3L

Telephone: +82-52-259-1027

Experience


2006.09-2009.08 Research Professor, POSTECH

2001.09-2006.08 Postdoc, University of Pennsylvania, Sejong Univ.

Education

1996.03-2001.08 Ph.D., KAIST

1994.03-1996.02 M.S., KAIST

1990.03-1994.02 B.S., Yonsei University

Research Topics

1. Theoretical modeling of materials with functional properties such as ferroelecrics,

piezoelectrics, thermoelectrics, etc.

2. Multiscale computational approaches


1. bdus Samad, Young-Han Shin, Mo2@VS2 nanocomposite as a superior hybrid anode material.

ACS Applied Materials & Interfaces 9, 29942-29949 (2017).

2. Aamir Shafique, Abdus Samad, Young-Han Shin, Ultra low lattice thermal conductivities and

carrier mobilities of single SnX2 (X=Se,S): a first principles study. Physical Chemistry Chemical

Physics 19, 20677-20683 (2017).

3. Abdus Samad, Aamir Shafique, Hye Jung Kim,and Young-Han Shin, Superionic and electronic

conductivity in monolayer W2C: ab initio predictions. Journal of Materials Chemistry A 5,

11094-11099 (2017).

4. Abdus Samad, Aamir Shafique, and Young-Han Shin, Adsorption and diffusion of mono, di, and

trivalent ions on two-dimensional TiS2. Nanotechnology 28, 175401 (2017).

5. Aamir Shafique and Young-Han Shin, Thermoelectric and phonon transport properties of two-

dimensional IV-VI compounds. Scientific Reports 7, 506 (2017).

6. Abdus Samad, Mohammad Noor-A-Alam, Young-Han Shin, First principles study of

SnS2/graphene heterostructure: a promising anode material for rechargeable Na ion batteries.

Journal of Materials Chemistry A 4, 14316-14323 (2016).

7. Mohammad Noor-A-Alam, Young-Han Shin, Switchable polarization in an unzipped graphene

oxide monolayer. Physical Chemistry Chemical Physics 18, 20443-20449 (2016).

8. Mohammad Noor-A-Alam, Hye Jung Kim, Young-Han Shin, Hydrogen and fluorine co-

decorated silicene: A first principles study of piezoelectric properties. Journal of Applied

Physics 117, 224304 (2015).

Computational evaluations of energy-harvesting and energy-storing

nanocomposite materials

Young-Han Shin

Department of Physics, University of Ulsan, Ulsan 44610, Korea

Nowadays people easily bring several electronic devices while traveling in a short or long

distance. To make them self-powered, external energy sources such as light, wind, heat might be

considered to store their energy in secondary batteries. Depending on the external stimuli, the

best responding physical properties can be chosen to find corresponding materials.

Computational evaluations of these physical properties can help develop future energy materials.

In addition to the energy-harvesting materials, the development of materials is also required for

storing energy. In this presentation, I am going to show a series of researches in my research

group on the piezoelectric, thermoelectric properties of low-dimensional materials as well as the

ionic transport on top of the surface of the materials. Especially we focus on the two-dimensional

materials such as graphene, h-BN, silicene, SnSe, SnS, GeSe, GeS, SnS2, TiS2, MoS2, VS2. For

using as solid electrolyte, the structural properties of antiperovskite Na3OCl will be also

mentioned. Most results were obtained from first-principles calculations.

Two physical properties (piezoelectricity and thermoelectricity) for energy harvest that are obtained from

total energy calculations. (a) Piezoelectricity of chair hydrogenated or fluorinated h-BN, (b) lattice thermal

conductivity of monolayer SnSe2

Mauro Boero

Institut de Chimie et Physique des Matériaux de Strasbourg

University of Strasbourg and CNRS UMR 7504, 23 Rue du Loess,

F-67034 Strasbourg, France



Telephone: +33-3-88107142

Experience

2008.12-present Research Director, IPCMS University of Strasbourg-CNRS, France

Scientific director of the HPC Mesocenter Equip@Meso, Strasbourg

Visiting Full Professor, The University of Tokyo, Japan

2001.09-2008.11 Associate Professor, University of Tsukuba, Japan

1998.05-2001.08 Research Fellow, AIST Tsukuba, Japan

1996.07-1998.04 Postdoc, Max-Planck Institut für Festkörperforschung, Stuttgatr, Germany

1995.07-1996.06 Postdoc, IBM Research Laboratory, Zurich, Switzerland

1994.09-1995.06 Postdoc, Swiss Federal Institute of Technology in Lausanne (EPFL),

Switzerland

Education

1991.09-1994.08 Ph.D., University of Torino (Italy) and EPFL Lausanne (Switzerland)

1989 “Laurea cum laude.” in physics, University of Turin (Italiy),

Research Topics

1. Molecular modeling in materials sciences and biosciences

2. Computational approaches and massively parallel computing

Recent Selected Publications

1. A. Amokrane, S, Klyatskaya M. Boero, M. Ruben, J-P. Bucher, ACS Nano (accepted).

2. K. Koizumi, K. Nobusada M. Boero, Phys. Chem. Chem. Phys. 19, 3498 (2017) – cover issue

3. K. Koizumi, K. Nobusada M. Boero , Chemistry Eur. J. 23, 1531 (2017) – frontispiece

4. K. Koizumi, K. Nobusada M. Boero, Chemistry Eur. J. 22, 5181 (2016) – cover issue

Simple but efficient method for inhibiting sintering of catalytic Pt nano-

clusters on metal-oxide support

Kenichi Koizumi1,2*

, Katsuyuki Nobusada1,2

, and Mauro Boero3,41,*

1 Department of Theoretical and Computational Molecular Science, Institute for Molecular

Science, Myodaiji, Okazaki 444-8585, Japan 2 Elements Strategy Initiative for Catalysts and Batteries (ESICB), Kyoto University, Katsura,

Kyoto 615-8520, Japan 3 University of Strasbourg, Institut de Physique et Chimie des Matériaux de Strasbourg

(IPCMS),CNRS UMR 7504, 23 rue du Loess, F-67034 Strasbourg, France 4Computational Materials Science Initiative (CMSI) Post-K Project, Dept. of Applied Physics,

University of Tokyo, Hongo, Tokyo (Japan)

*Corresponding author: [email protected]

The sintering is a major source of concern in precious metals nano-catalysts since it induces the

formation of large nanoparticles and particles with negative consequences on the accessible

active surface of the catalyst. We propose a simple and efficient method to inhibit aggregation

and sintering of Pt clusters supported on metal-oxide. Our proposed workaround allows to solve

this problem and preserves the accessible catalytic surface even at relatively high temperatures

(~700 K), as the ones expected to experience by this class of catalytic systems. The key idea is

the inclusion of transition metal atoms, such as Ni, into the Pt clusters. Ni atoms, in turn, realize

an anchoring via the formation of strong chemical bonds with oxygen atoms present in the typical

metal–oxide support. To elucidate the efficiency of the method, we use first-principles molecular

dynamics enhanced with free-energy sampling methods. To this aim, we introduce a specific

reaction coordinate to control the average coordination number of each cluster insensitive to

periodic boundary conditions routinely adopted in this type of simulations. This allows for a

precise description of the sintering processes and for an accurate estimation of the related free-

energy barriers for aggregations. These virtual experiments show how doped Ni atoms, having a

stronger affinity to O than Pt, anchor tightly the Pt nanocluster to the metal-oxide supports and

inhibit the tendency of these clusters to aggregate on the support.

Dr. Laurent Limot

Institut de Physique et Chimie des Matériaux de Strasbourg

Université de Strasbourg, CNRS, IPCMS, UMR 7504, F-67000

Strasbourg, France


http://www-ipcms.u-strasbg.fr/stmipcms/

Telephone: +33-388-10-70-22

Experience

2006.10-present CNRS Researcher

2006.03-2006.09 Postdoc, Université de Strasbourg, CNRS

2001.01-2006.02 Postdoc, Kiel University

Education

1997.10-2000.12 Ph.D., Laboratoire de Physique des Solides, Université Parsi-Sud

1995.10-1997.07 M.S., Université Parsi-Sud

1992.10-1995.07 B.S., Université Parsi-Sud

Research Topics

1. Electronic and spin-polarized transport across single atoms and molecules, molecular

magnetism, surface magnetism

2. Techniques: Scanning Tunneling Microscopy (STM) and Spectroscopy (STS), Inelastic Electron

Tunneling Spectroscopy (IETS), Spin-Polarized STM (SP-STM)


1. Controlled spin switch in a metallocene molecular junction, Nature Commun. (accepted)

2. Efficient spin-flip excitation of a nickelocene molecule, Nano Lett. 17, 1877 (2017)

3. Kondo resonance of a Co atom exchange coupled to a ferromagnetic tip, Nano Lett. 16, 6298

(2016)

Molecular spin coupling at the tip of a STM

M. Ormaza

1, P. Abufager

2, B. Verlhac

1, N. Bachellier

1, M.-L. Bocquet

3, N. Lorente

4, and Laurent Limot

1,*

1Université de Strasbourg, CNRS, IPCMS, UMR 7504, F-67000 Strasbourg, France

2Instituto de Física de Rosario, CONICET, Universidad Nacional de Rosario, Argentina

3Ecole Normale Supérieure, UPMC Univ. Paris 06, CNRS, 75005 Paris, France

4CFM/MPC and DIPC, 20018 Donostia-San Sebastián, Spain

Recent advances in addressing and controlling the spin states of a surface-supported object (atom

or molecule) have further accredited the prospect of quantum computing and of an ultimate data-

storage capacity [1]. Information encoding requires that the object must possess stable magnetic

states, in particular magnetic anisotropy to yield distinct spin-dependent states in the absence of a

magnetic field together with long magnetic relaxation times. Scanning probe techniques have

shown that inelastic electron tunneling spectroscopy (IETS) within the junction of a scanning

tunneling microscope (STM) is a good starting point to study the stability of these spin states [2].

STM-IETS allows for an all-electrical characterization of these states by promoting and detecting

spin-flip excitations within the object of interest. It can also provide an electrical control over

them, simplifying the information readout process. As spin excitations need however to be

preserved from scattering events with itinerant electrons, single objects are usually placed on

non-metallic surfaces such as thin-insulating layers or superconductors.

In this sense, new approaches to improve the detection of spin-flip excitations are desirable. With

this purpose we present here a novel strategy based on the molecular functionalization of a STM

tip. We study the surface magnetism of a simple double-decker molecule, nickelocene

[Ni(C5H5)2], which is adsorbed directly on a copper surface. By means of X-ray magnetic circular

dichroism and density functional theory calculations, we show that nickelocene on the surface is

magnetic (Spin = 1) and possesses a uniaxial magnetic anisotropy, while IETS reveals an

exceptionally efficient spin-flip excitation occurring in the molecule [3]. Interestingly,

nickelocene preserves its magnetic moment and magnetic anisotropy not only on the surface, but

also in different metallic environments. Taking advantage of this robustness, we are able to

functionalize the STM tip with a nickelocene, which can then be employed as a portable source

of inelastic excitations. As we will show during the talk, IETS can then be used to probe the

interaction between a surface-supported object and the nickelocene tip, including a magnetic

interaction.

References

[1] T. Choi et al., Nat. Nanotech. 6 (2017)

[2] C.F. Hirjibehedin et al., Science 312, 1021 (2006)

[3] M. Ormaza et al., Nano Lett. 17, 1877 (2017)

Graphical Abstract (1 Figure)

The center panel sketches the STM setups employed. With a metal tip, IETS reveals an

exceptionally efficient spin-flip excitation for nickelocene adsorbed on a copper surface. Intense

stepped-like features symmetric relative to zero-bias are in fact detected at ±3.2 meV in the

tunneling spectrum (left panel). This energy corresponds to the uniaxial magnetic anisotropy of

nickelocene, in other words below 3.2 meV the magnetic moment of the molecule is parallel to

the aromatic rings, while above 3.2 meV the magnetic moment is along the principal molecular

axis. Interestingly, the molecule preserves its magnetic moment and magnetic anisotropy in

different metallic environments. By taking advantage of this property, we are able to

functionalize the STM tip with a nickelocene molecule. Such a tip can then be employed as a

portable source of inelastic excitations and used to produce, for example, a double spin-flip

excitation (right panel).

Prof. Jungdae Kim

Nanoscale Surface Science Laboratory




Homepage: https://sites.google.com/site/nsslab6789/home

Telephone: +82-52-259-2324

Experience

2016.09-present Associate Professor, University of Ulsan

2012.09-2016.08 Assistant Professor, University of Ulsan

2011.05-2012.08 Postdoc, Brookhaven National Lab

2010.09-2011.04 Postdoc, University of Texas at Austin

Education

2004.09-2010.08 Ph.D., University of Texas at Austin

2001.03-2003.02 M.S., Seoul National University

1994.03-2000.08 B.S., Pusan National University

Research Topics

1. Surface science using home-built scanning tunneling microscope (STM)

2. 2D layered chalcogenide materials


1. Revealing the origin of p-type characteristics in a SnSe single crystal. Appl. Phys. Lett.

(accepted).

2. Achieving ZT=2.2 with Bi-doped n-type SnSe single crystals. Nat. Commun. 7, 13713 (2016).

3. A microscopic study investigating the structure of SnSe surfaces. Surf. Sci. 651, 5 (2016).

https://sites.google.com/site/nsslab6789/home

STM study on the layered chalcogenide materials

Ganbat Duvjir1, Trinh Thi Ly

1, Sunglae Cho

1, Young Jun Chang

2, Jaekwang Lee

3, and Jungdae Kim

1,*

1Department of Physics, BRL, and EHSRC, University of Ulsan, Ulsan 44610, Korea

2Department of Physics, University of Seoul, Seoul 02504, Korea

3Department of Physics, Pusan National University, Busan 46241, Korea


Layered chalcogenide materials (LCMs) have been intensively studied due to their versatile

physical properties when prepared in a few monolayer thicknesses. Weak van der Waals coupling

between layers allows simple mechanical exfoliation to fabricate two-dimensional LCMs.

Scanning tunneling microscopy/spectroscopy (STM/S) is an ideal probe to investigate the

microscopic nature of materials at the atomic scale. In this presentation, recent STM studies on

SnSe, SnSe1-xSx will be discussed. SnSe is a IV-VI semiconductor with a band gap of ~1.0 eV.

Recently, Zhao et al. [Nature 508, 373 (2014)] reported the ultra-high thermoelectric performance

of SnSe single crystal with a maximum ZT = S2σT/κ (figure of merit) value of 2.6 at 923 K,

where S is the Seebeck coefficient, σ is the electrical conductivity, κ it the thermal conductivity,

and T is the absolute temperature. Although this high ZT value has attracted considerable

attention, the microscopic origin of p-type character of SnSe has yet to be clearly understood.

Here, we directly observed and identified intrinsic point defects existing on the SnSe via home-

built STM, and investigated the role of defects on the electronic properties using density

functional theory (DFT) calculations. In addition, we investigate the structural evolution of

crystalline SnSe1-xSx on the atomic scale by combining STM measurement with DFT

calculations. If time is allowed, interesting structural changes on monolayer VSe2 will be

discussed at the end of presentation.

Pictures of home-built low temperature scanning tunneling microscope (STM) system in Nanoscale

Surface Science Lab (Prof. Jungdae Kim).

Dr Bertrand DONNIO

Institut de Physique et Chimie des Matériaux de Strasbourg

UMR7504 CNRS-University of Strasbourg



Telephone: +33 (0)688107156

Experience

2015.09-present DR CNRS, CNRS-University of Strasbourg

2013.01-2015.08 DR CNRS, COMPASS-SOLVAY-UPENN

2010.10-2012.12 DR CNRS, CNRS-University of Strasbourg

1999.10-2010.10 CR CNRS, CNRS-University of Strasbourg

1996.03-1999.10 PDF (U. Neuchâtel-CH, U. Exeter-UK, U. Freiburg-D)

Education

2009.02 HDR., University of Strasbourg, F

1992.09-1996.02 PhD, University of Sheffield, UK

1992.09-1996.09 MS, University of Rennes, F

Research Topics

1. Supramolecular chemistry, liquid crystal self-assembly

2. Synthesis (oligomeric molecules, dendrons & dendrimers, coordination metal complexes, ..)

3. Functionalization and self-assembly of nanoparticles


[1] D. Jishkariani, et al. J. Am. Chem. Soc. 2015 137 10728−10734.

[2] B. T. Diroll, et al. J. Am. Chem. Soc. 2016 138 10508-10515.

[3] B. T. Diroll, et al. Nano Lett. 2015 15 8008−8012

[4] S. Fleutot, et al. Nanoscale 2013 5 1507−1516.

[5] B. Donnio, et al. Adv. Mater. 2007 19 3534−3539.

[6] L. Malassis, et al. Nanoscale 2016 8 13192-13198.

Ligand-Directed Self-Assembly Of Nanoparticles

E. Terazzi,† G. Nealon,† S. Buathong,† R. Gréget,† A. Graviluta,† T. Selvam,† C. Dominguez,† D.

Jishkariani,‡ Katherine C. Elbert, ‡ B. T. Diroll,‡ M. Cargnello,‡ L. Malassis,‡ C. B. Murray,‡ J.L.

Gallani,† B. Donnio†,*

U PENN-SOLVAY (USA)‡ & IPCMS (France)†


Self-assembly of nanoparticles (NPs) into periodic superlattices is of relevance for engineering

materials with new, tunable and reconfigurable functions, and are therefore much sought after for

the emergence of innovative applications. The collective physical properties of NPs (especially

optical and magnetic) and their interactions with the environment (sound, EM waves) are

strongly modified when organized into such superlattices, and are essentially controlled by the

symmetry, the nature (single or multicomponent systems) and the interparticular separations.

Various strategies for NPs self-assembly have been developed so far with more or less success.

We are currently developing a bottom-up chemical route for the fabrication of NP superlattices,

whose self-assembly is directed by the surface functionalization (ligand shell) of the NPs.

Illustrated by some examples, we will show how the ligand shell affects both self-assemblies and

certain other physical properties.

i) Dendritic ligands of several generations tethered to the surface of NPs allow the control of their

assemblies into 2/3D superlattices, whereas the change in the dendritic generation allows for a

precise and stepwise control of NP separation. This offers potential for optimizing collective

responses for applications including optical and magnetic. Dual mixing of dendronized species

further produces unprecedented binary superlattices, whose properties are intrinsically modulated

at the nm-scale. Multifunctionality in dendrons is readily achieved and leads to unique and

original patchy NPs, with modulable surface and self-assembly properties.

ii) Hydrophobic colloidal NPs are mainly synthesized and manipulated with commercially

available ligands. These remain invaluable but surface functionalization is typically limited to a

small number of molecules. We have recently proposed a robust method using polycatenar

ligands for the direct synthesis of a wide variety of monodisperse NPs. Self-assembly into single

and binary NP superlattices demonstrates the excellent monodispersity of the so-produced NPs.

In addition, some NPs self-assemble into bcc lattices that deviate from conventional close-packed

structures (fcc or hcp) formed by the same NPs coated with commercial ligands. These

polycatenar ligands impose interparticle spacings and specific attractions, engineering self-

assembly, which is tunable from hard sphere to soft sphere behaviour.

Polycatenar and dendritic molecules therefore offer versatile and modular platforms for the

development of ligands with targeted properties, bringing organic functionality to inorganic NCs.

This subsequently controls aspects such as solubility, wettability, interparticle spacings, self-

assembly, liquid crystalline behaviour, biological and physical properties. It is expected that

structural complexities and practical utilities be achieved through a thoughtful exploitation of

organic chemistry and expanded to various inorganic systems.

Prof. Sunglae Cho

Spintronic Materials Lab.




Telephone: +82-52-259-2322

Experience


1998.10-2000.02 Post-doc, Northwestern University

Education

1991.09-1997.12 Ph.D., Northwestern University

1987.03-1989. 02 M.S., Pusan National University

1983.03-1987.02 B.S., Pusan National University

Research Topics

1. Thin film & superlattice thermoelectric materials

2. Magnetic thin film and artificial layers

3. Oxide thin film growth using atomic oxygen source


1. Achieving ZT=2.2 with Bi-doped n-type SnSe single crystals. Nature Communications 7, 13713

(2016).

2. Synthetic hybrid Co2FeGe/Ge(Mn) superlattice for spintronics applications. Applied Physics

Letters 109, 172401 (2016).

2D SnSe single crystal for thermoelectric applications

Anh Tuan Duong1, Van Quang Nguyen

1, Ganbat Duvjir

1, Van Thiet Duong

1, Suyong Kwon

2, Jae Yong

Song2, Jae Ki Lee

3, Ji Eun Lee

3, Su-Dong Park

3, Taewon Min

4, Jaekwang Lee

4, Jungdae Kim

1, and

Sunglae Cho1,*

1 Department of Physics and Energy Harvest-Storage Research Center, University of Ulsan, Ulsan 680-

749, Republic of Kore 2 Division of Industrial Metrology, Korea Research Institute of Standards and Science (KRISS), Daejeon

305-340, Republic of Korea 3 Thermoelectric Conversion Research Center, Creative and Fundamental Research Division, Korea

Electrotechnology Research Institute (KERI), Changwon 51543, Republic of Korea 4 Department of Physics, Pusan National University, Busan 605-735, Republic of Korea


SnSe is a semiconductor with an indirect band gap energy of Eg =0.829 eV at 300 K with

orthorhombic Pnma phase, while it shows direct band gap of Eg = 0.464 eV with Cmcm structure

phase at high temperature. It exhibits two dimensional (2D) layered structure with strong Sn-Se

bonding along b-c plane and weaker bonding along a axis direction, resulting in a strong

anisotropic transport properties. Recently, Zhao et al. reported that high thermoelectric power

factor and low thermal conductivity at high temperature make SnSe as a very good p-type

thermoelectric material; ZT values along b and c axes are up to 2.6 and 2.3 at 923 K, respectively.

They attributed the remarkably high ZT value along the b axis to the intrinsically low lattice

thermal conductivity in SnSe. More recently, two first-principles calculations predicted good

thermoelectric performances in both n- and p-type SnSe’s and better n-type thermoelectric

properties than p-type SnSe and J. Yang et al. predicted ZT~3.1 in n-type SnSe. Here we report

that n-type SnSe single crystals were successfully synthesized by doping for the first time and

also n-type carrier concentration can be controlled by doping content. In this talk we will discuss

on dopant type and thermoelectric properties of SnSe single crystals in detail.

Prof. Florian Banhart

IPCMS


Strasbourg, France



Telephone: +33-388-107103

Experience

since 2007 Professor of Physics, University of Strasbourg

2003 – 2007 Professor of Physical Chemistry, University of Mainz, Germany

1999 – 2003 Staff Scientist, University of Ulm, Germany

1989 – 1999 Scientist, Max-Planck Institute of Metals Research, Stuttgart, Germany

Education

1988 PhD, University of Stuttgart, Germany

1985 Master in Physics, University of Stuttgart, Germany

Research Topics

1. Low-dimensional nanomaterials

2. Electron microscopy


1. O. Cretu, A.V. Krasheninnikov, J.A. Rodríguez-Manzo, R. Nieminen and F. Banhart, Migration and localization of metal atoms on graphene, Phys. Rev. Lett. 105, 196102 (2010)

2. A. La Torre, A. Botello-Mendez, W. Baaziz, J.-C. Charlier, F. Banhart, Strain-induced metal-semiconductor transition observed in atomic carbon chains, Nature Comm. 6, 6636 (2015)

3. K. Bücker, M. Picher, O. Crégut, T. LaGrange, B. W. Reed, S. T. Park, D. J. Masiel, F. Banhart, The electron dynamics in an ultrafast transmission electron microscope with Wehnelt electrode, Ultramicroscopy, 171, 8 (2016)

In-situ electron microscopy at high spatial and temporal resolution

Kerstin Bücker, Matthieu Picher, Ferdaous Ben Romdhane, and Florian Banhart*

Institut de Physique et Chimie des Matériaux de Strasbourg, CNRS, Université de Strasbourg

*[email protected]

In-situ transmission electron microscopy carries out experiments on small objects while they are

under observation in the microscope. Dynamic phenomena in nanoobjects can thus be observed

in real time and at atomic spatial resolution. Examples of our recent work in in-situ

experimentation will be shown where the integration of an STM tip into the TEM specimen stage

allowed the electrical characterization of nanomaterials. In such an arrangement, the electrical

properties of chains of carbon atoms in the sp1 hybridization have been studied. Among many

other previously unknown features, a metal-semiconductor transition upon straining the atomic

chains has been found (Nat. Comm. 6, 6636 (2015)).

While the spatial resolution of conventional in-situ TEM has reached the ultimate limits, the

temporal resolution remained moderate. Now, with pulsed electron beams, the timescale down to

the picosecond becomes accessible. A new ultrafast TEM has been installed at the IPCMS in the

past years in the framework of a national excellence initiative. The microscope is able to operate

in the stroboscopic as well as in the single-shot mode to study reversible as well as irreversible

phenomena in nanomaterials with pico- to nanosecond time resolution. The potentials of this new

technique will be presented on the basis of the first results obtained with this microscope

(Ultramicr. 171, 8 (2016)).

Prof. Yong Soo Kim

Semiconductor Device Research Lab




Homepage: http://semidevreslab.wixsite.com/srdl

Telephone: +82-52-259-2326

Experience

2016.01-present Chair, Department of Physics, University of Ulsan

2016.01-present Director, BK21+ program

2014.08-2016.07 Vice president, Natural Science College, University of Ulsan

2014.10-present Associate Professor, University of Ulsan

2013.08-2014.02 Visiting Scholar, State University of New York, Binghamton

2008.09-2014.09 Assistant Professor, University of Ulsan

1998.10-2008.08 Principle, Senior, and Junior Researcher, Memory R&D Division, SK-

Hynix Semiconductor Inc.

Education

1993.03-1998.08 Ph.D., Seoul National University

1991.03-1993.02 M.S., Seoul National University

1987.03-1991.02 B.S., University of Ulsan

Research Topics

1. TMDC (Transitional metal dichalcogenides; MX2) growth and electrical/optical

characterization, especially nonlinear optical properties

2. Valleytronics & Bose-Einstein condensation with half matter-half photon, Polariton

3. Thin film solar cell with abundant materials, such as Cu2ZnSnS(Se)4 and organic material.


1. Growth and Simultaneous Valleys Manipulation of Two-Dimensional MoSe2-WSe2 Lateral

Heterostructure, ACS Nano (2017) DOI: 10.1021/acsnano.7b02914.

2. Impact of Selenium Doping on Resonant Second-Harmonic Generation of Monolayer MoS2.

ACS Photonics 4, 38-44 (2017).

3. Pulsed laser deposition assisted grown continuous monolayer MoSe2, CrystEngComm 18, 6992

(2016).

4. Enhancement of recombination process using silver and graphene quantum dot embedded

Intermediate Layer for Efficient Organic Tandem Cells. Scientific Reports 7, 30327 (2016).

5. Strong optical nonlinearity of CVD-grown MoS2 monolayer as probed by wavelength-

dependent second. Physical Review B 90, 121409(R) (2014); 92, 159901(E) (2015).

6. Direct vapor phase growth process and robust optical properties of large area MoS2

layer, Nano Research 7, 1759 (2014).

http://semidevreslab.wixsite.com/srdl

Monolayer transition metal dichalcogenides growth and its applications

Chinh Tam Le,1 Farman Ullah,

1 Joon. I. Jang,

2 and Yong Soo Kim

1,*

1Department of Physics, University of Ulsan, Ulsan 44610, Republic of Korea

2Department of Physics, Sogang University, Seoul 04107, South Korea


Graphene, a single atomic layer of carbon atoms, has attracted grated attention because of its

novel physical properties and potential for electro-optical technology. Recently this interest has

expanded to the wide class of two-dimensional materials that occur naturally as 2D layers of van-

der-Waals crystals. While preserving graphene’s flexibility and tenability by external

perturbations, atomically thin layers of this broader set of materials provide access to more varied

electronic and optical properties, including semiconductor and insulating behavior.

In this presentation, we will discuss some distinctive properties and large area continuous growth

of atomically thin 2D semiconductor, especially transition metal dichalcogenide (MX2 where

M=Mo, W and X = Se, S). [1,2] We also demonstrated monolayer Mo(S,Se)2 is next generation

nonlinear optical material for its strong optical nonlinear properties with second harmonic

generation characteristics. [3-5] Furthermore we will demonstrate the covalently bonded in-plane

heterostructure (HS) of monolayer transition metal dichalcogenides (TMDCs) possesses huge

potential for high-speed electronic devices in terms of the new exciting field of valleytronics.

References

[1] V. Senthilkumar, C. T. Le , J. I. Jang, Y. S. Kim et al., Nano Res. 7, 1759 (2014).

[2] F. Ullah, T. K. Nguyen, C. T. Le and Y. S. Kim, CrystEngComm 18, 6992 (2016).

[3] D. J. Clark, V. Senthilkumar, C. T. Le, Y. S. Kim, J. I. Jang et al., Phys. Rev. B 90, 121409(R) (2014);

Phys. Rev. B 92, 159901(E) (2015).

[3] D. J. Clark, C. T. Le, V. Senthilkumar, F. Ullah, Y. S. Kim, J. I. Jang et al., Appl. Phys. Lett. 107,

131113 (2015).

[4] C. T. Le, D. J. Clark, F. Ullah, V. Senthilkuma, J. I. Jang, Y. S. Kim et al., Ann. Phy. 528, 551 (2016).

[5] C. T. Le, D. J. Clark, F. Ullah, V. Senthilkuma J. I. Jang, Y. S. Kim, et al., ACS Photon. 4, 38 (2017).

[6] F. Ullah, Y. S. Kim et al., ACS Nano (2017) DOI: 10.1021/acsnano.7b02914.

Prof. Stéphane BERCIAUD

Institut de Physique et Chimie des Matériaux de Strasbourg (IPCMS)

Université de Strasbourg & CNRS, UMR 7504

23 Rue du Loess F-67034 BP 43 Strasbourg Cedex 2



Telephone: +33 (0) 3-8810-7256

Experience

2016-present Professor, Université de Strasbourg

Junior member of Institut Universitaire de France (IUF)

2010-2016 Assistant Professor, Université de Strasbourg

2007-2010 Postdoctoral research scientist at Columbia University (New York, USA)

2007 Postdoctoral research scientist at Université Bordeaux 1 (France)

Education

2006 PhD in Physics at Université Bordeaux 1 (France)

1999-2003 Ecole Normale Supérieure de Cachan (France)

Research Topics

・Graphene, transition metal dichalcogenides and low-dimensional heterostructures

・Nanophotonics, optical spectroscopy

・Nanodevices, optoelectronics, optoelectromechanics


1. D. Metten, G. Froehlicher, and S. Berciaud, 2D Materials 4, 014004 (2017)

2. E. Lorchat, G. Froehlicher, and S. Berciaud, ACS Nano 10, 2752 (2016)

3. G. Froehlicher et al., Nano Letters 15, 6481 (2015)

4. G. Froehlicher and S. Berciaud, Phys. Rev. B 91, 205413 (2015)

5. C. Faugeras, S. Berciaud, et al, Phys. Rev. Lett. 114, 126804 (2015)

6. F. Federspiel et al., Nano Letters 15, 1252 (2015)

7. D. Metten, F. Federspiel, M. Romeo, and S. Berciaud, Phys. Rev. Applied 2, 054008 (2014)

8. S. Berciaud, M. Potemski, and C. Faugeras, Nano Letters 14, 4548 (2014)

mailto:[email protected]

Optical spectroscopy of heterostructures made from graphene

and related two-dimensional materials

Guillaume FROEHLICHER, Etienne LORCHAT, Stéphane BERCIAUD

Institut de Physique et Chimie des Matériaux de Strasbourg (IPCMS)

Université de Strasbourg & CNRS, UMR 7504

23 Rue du Loess F-67034 BP 43 Strasbourg Cedex 2

email: [email protected]

The recent rise of a vast family of two-dimensional materials (such as graphene, boron nitride and transition

metal dichalcogenides) with unique electronic and optical properties has opened exciting perspectives for the design

and study of van der Waals heterostructures [1]. At the same time, a variety of low-dimensional semiconductor

nanostructures with size- and shape-tunable optical properties can be routinely synthesized using colloidal chemistry

methods and combined with two-dimensional materials to form hybrid heterostructures [2-4]. The behavior of

photoexcited carriers and excitons in both types of heterostructures is strongly affected by near-field coupling. In

particular, photoinduced charge transfer [2] and/or Förster-type energy transfer [3,4] at a heterointerface may

drastically alter the photophysical and optoelectronic properties. Unravelling the efficiency of these phenomena and

their dependence upon the incoming photon flux or an externally applied field is of utmost importance for

optoelectronic and energy-related applications.

In this presentation, we will introduce some unique physical properties of two-dimensional materials and

review recent optical studies of charge and energy transfer in hybrid and van der Waals and heterostructures [4,5].

Figure 1: (a) Optical image of a MoSe2/graphene (SLG) van der Waals heterostructure fabricated at

IPCMS. Photoinduced charge and energy transfer from a two-level system to graphene are illustrated in

(b). The map of the graphene Raman G-mode frequency (c) and of the MoSe2 photoluminescence intensity

(d) of this sample reveals clear signatures of interlayer coupling on the heterostructure (dashed contour in

a, c, d). In particular, the significant stiffening of the Raman G-mode observed on the heterostructure (c) is

assigned to photoinduced electron transfer from MoSe2 to graphene (from [5]).

1 A.K. Geim and I. V. Grigorieva, Nature 499, 419 (2013)

2 G. Konstantatos et al. Nature Nanotechnology 7, 363 (2012)

3 Z. Chen, S. Berciaud, C. Nuckolls, T.F Heinz & L.E. Brus ACS Nano 4, 2964 (2010)

4 F. Federspiel, G. Froehlicher, M. Nasilowski, S. Pedetti, A. Mahmood, B. Doudin, S. Park, J-O Lee, D. Halley, B.

Dubertret, P. Gilliot, & S. Berciaud Nano Letters 15, 1252 (2015) 5 G. Froehlicher, E. Lorchat, S. Berciaud Arxiv 1703.05396

Mo

Se2

PL

Inte

nsi

ty(a

rb. u

.)

MoSe2

SLG

5 µm

SLG onMoSe2

0

1

Charge Transfer Energy Transfer

G-m

od

e fr

equ

ency

(cm

-1)

1582 cm-1

1589 cm-1

1590

1585

1580

a b

c d

mailto:[email protected]

Workshop Department of Physics, University of Ulsan … · Workshop Department of Physics, University of ... Interdisciplinary Research at Strasbourg Institute of Physics and Chemistry

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