MOLETRONICS Under the guidance of Dr .Y. SYAMALA Associate Professor Department of ECE Gudlavalleru Engineering College. By B N V A SURENDRA BABU 13481D5505 M.Tech -Embedded Systems.
Welcome message from author
This document is posted to help you gain knowledge. Please leave a comment to let me know what you think about it! Share it to your friends and learn new things together.
Transcript
MOLETRONICS
Under the guidance of
Dr .Y. SYAMALAAssociate Professor
Department of ECE
Gudlavalleru Engineering College.
By
B N V A SURENDRA BABU
13481D5505
M.Tech -Embedded Systems.
Introduction
Substrates used in moletronics
Typical resistivity
Molecular wires
Molecular electronic components
Realization of basic circuits
Molecular electronic memory cell
Advantages of molecular electronics
Conclusion
References
01-05-2015 1
o Molecular electronics, also called moletronics, is an
interdisciplinary subject that spans chemistry, physics
and materials science.
o The feature of molecular electronics is the use of
molecular building blocks to fabricate electronic
components, both active (e.g. transistors) and passive
(e.g. resistive wires).
01-05-2015 3
o Polymers are flexible, versatile and easy to process.
o These are behave like a conventional inorganic
semiconductor.
o Does not possess reasonable charge carrier mobility.
Mobility obtained in polymers is low.
o In organic polymers existence of controllable band
gap is present in the order of 0.75 to 2 ev.
01-05-2015 4
01-05-2015 5
o Polyphenylene based chains are used as molecular
wires and switches.
o A second type of molecule that can be used as
molecular wires is the carbon nanotube or “bucky
tube”.
o Carbon nanotubes have conductive properties
ranging from excellent conduction to good
insulation.
01-05-2015 6
The current that passes through the molecular wires
is about 30 A, or about 30 nA per molecule.
Alkyldithiol
Oligo (p-phenylene)-dithiol
(p-phenylene ethynylene)-dithiol
01-05-2015 7
o Carbon nanotubes have conductive properties
ranging from excellent conduction to good
insulation.
01-05-2015 8
Molecular Transistors
Molecular Rectifier
Molecular Switch
01-05-2015 9
In molecular transistor two arms
are connected to electrodes, the
dot acts as a tunneling barrier.
The barrier can be modulated by
applying a potential to the third
terminal, which behaves as a
“gate".
In molecular transistor a
switching frequency upto
10THz can be reached.
01-05-2015 10
The molecular rectifier consisted of D--A system: An
electronic donating moiety(D) with low ionization
potential, tetrathiafulvalene, connected to an accepting
group(A) with high electron affinity, tetracyano
quinodimethane, by an “insulating" bonded spacer.
01-05-2015 11
Molecular diode
structure
Schematic molecular
model
01-05-2015 12
A molecular switch is the photochromic switch
consisting of a ithienylethene molecule. This
switch behavior is actived by photons in this case.
The molecule is illuminated by UV light, thienyl
rings assume a closed shape, closing the bridge,
the molecule can then be switched back to its
open form by irradiation with visible light.
01-05-2015 13
Molecular logic OR gate
Molecular logic AND gate
Molecular logic XOR gate
01-05-2015 14
Circuit diagram Schematic diagram
01-05-2015 15
Circuit diagram Schematic diagram
01-05-2015 16
Circuit diagram Schematic diagram
01-05-2015 17
The developments in molecular electronic devices
with the solid-state TSRAM design to propose
molecular electronic implementations of TSRAM.
01-05-2015 18
01-05-2015 19
Size
Power
Assembly
Manufacturing Cost
Low Temperature Manufacturing
Synthetic flexibility
01-05-2015 20
In molecular electronics, or moletronics,
single molecules serve as switches, "quantum
wires" a few atoms thick serve as wiring.
The hardware is synthesized chemically from
the bottom up approch which is used to reduce
the power consumption.
01-05-2015 21
1) Lorente N. and Joachim C. “Architecture and Design of
Molecule Logic Gate and Atom Circuit", 2013.
2) Gubin S. Petal. “Molecular clusters as building blocks for
nanoelectronics: the first demonstration of a cluster
single-electron tunnelling transistor at room
temperature“, Nanotechnology, 2002.
3) Prasongkit and Jariyanne. “Molecular Electronics - Insight
from An-Initio Transport Simulation", 2011.
4) Heat James R. and Ratner Mark A. “Molecular
Electronics". Physics Today, pp.43 - 49, 2003.
5) Chen J., Lee T., Su J., Wang W., Ratner Mark A and Reed
“Molecular Electronic Devices", pp. 672-687, 2011.
01-05-2015 22
6) Mantooth B.A. and Weiss P.S. “Fabrication, Assembly,
and Characterization of Molecular Electronic
Components". In Proceedings of the IEEE, vol 91, 2003.
7) Wang W., Lee T., and Reed M.A.R. “Electronic Transport
in Molecular Self-Assembled Monolayer Devices". In
Proceedings of the IEEE, volume 93, 2005.
8) Cuniberti G. and Fagas G. Richter K. “Introducing
Molecular Electronics”, vol 680 of Lect. Notes Phys.
Springer, 2005.
9) Reed M. A. “Molecular Electronics - Current Status and
Future Prospects". FED Journal, 2000.
10) Winpenny R.E.P. “Strecht for a moment“, Nature
nanotechnology, 2013.
01-05-2015 23
01-05-2015 24
Related Documents
