BSc Thesis Jochen Wolf

Technische Universität München

Realizing flexibility and artificial structures for organic solar cells

Advisor: Claudia M. Palumbiny

Supervisor: Peter Müller-Buschbaum

Technische Universität München, Physik-Department,

Lehrstuhl für Funktionelle Materialien, James-Franck-Str.1, 85748 Garching

Bachelor Thesis by Jochen Wolf


05/08/2013 Jochen Wolf 2

0. Outline

1.1 Motivation

1.2 Working principle of organic solar cells

1.3 Device architectures

1.4 Sample preparation

2.1 Current-voltage measurements

2.2 UV\Vis measurements

2.3 Scanning electron microscope

3. Structuring on PET

4. Conclusion and acknowledgements



1.1 Motivation

plusplasticelectronics.com

konarka.com

popsci.com

- transparent

- potentially cheap production

- flexible & light

after globalwarmingart.com

Sun spectrum



1.2 Working principle of organic solar cells

Equivalent circuit of solar cells

V

P3HT PCBM

Palumbiny MSc thesis

Meier MSc thesis Meier MSc thesis



1.3 Device architectures

archite

cture A architecture B

substrates:glass and PET

archite

cture C architecture D

Aluminium

Active Layer

PEDOT:PSS

ITO

substrate

Highly conductive PEDOT:PSS



1.4 Sample preparation

Meier MSc thesis



2.1 Current-voltage measurements

𝜂=𝑉 𝑀𝑃𝑃 𝐼𝑀𝑃𝑃

𝐴𝑃 𝑖𝑛

Efficiency

𝑉𝑀𝑃𝑃

𝐼𝑆𝐶

𝑉 𝑂𝐶

𝐼𝑀𝑃𝑃𝑀𝑃𝑃

ITO-freeContains ITO




Transmittance Reflectance

After DOI: 10.5772/52741

Perkin Elmer Perkin Elmer




Col

our

Dev

ice

arch

itect

ure

Ele

ctro

de

Ele

trcon

blo

ckin

g la

yer

Act

ive

laye

r

── A ITO PEDOT:PSS ── A ITO PEDOT:PSS P3HT:PCBM ── B ITO H-PEDOT:PSS ── B ITO H-PEDOT:PSS P3HT:PCBM ── C H-PEDOT:PSS ── C H-PEDOT:PSS P3HT:PCBM ── D H-PEDOT:PSS PEDOT:PSS ── D H-PEDOT:PSS PEDOT:PSS P3HT:PCBM

glass substrate PET substrate

300 400 500 600 700 8000

20

40

60

80

100

abso

rptio

n [%

]

wavelength [nm]

300 400 500 600 700 8000

20

40

60

80

100

abso

rptio

n [%

]

wavelength [nm]

with active layer

without active layer

with active layer




2.3 Scanning electron microscope

H-PEDOT:PSS spin coated on PET H-PEDOT:PSS spin coated on glass

Edge of PET foil ITO-PET foil


Lang Bachelor thesis



Imprint of a CD structure in PEDOT:PSS on PET

PET substrate

300 400 500 600 700 800

0

20

40

60

80

100

abso

rptio

n [%

]

wavelength [nm]

with active layer









4. Conclusion and acknowledgements

I would like to express my thanks the following people:

My supervisor: Peter Müller-Buschbaum

My advisor: Claudia M. Palumbiny

And all the rest of the E13 staff that made this thesis a great experience!

300 400 500 600 700 8000

20

40

60

80

100

abso

rptio

n [%

]

wavelength [nm]

- ITO-free organic solar cells feasible

- Layer thicknesses similar on PET and glass

- Need for a new supplier of PET

- Structured PEDOT:PSS on PET possible




Worldwide radiation average



Solar cycle and maximum efficiency



Efficiencies



Layers of the ITO-PET foil



molecular orbitals



Molecular structures

PEDOT PSS P3HTPCBM

PDMS



atomic force microscope (AFM)



solar simulator



H-PEDOT:PSS on PET



PET transmittance and reflectance



PET reflectance and transmittance



Transmittance to active layer



Current-voltage measurement on glass



Current-voltage measurement on glass



PDMS stamp



Solar cell



Flextrode

http://www.plasticphotovoltaics.org/flextrode.html

Flextrode by DTU



structuring

black silicon

PDMS stamp

PEDOT:PSS

BSc Thesis Jochen Wolf

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