Moletronics 140201085944-phpapp02

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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.

Transcript of Moletronics 140201085944-phpapp02

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

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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).

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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.

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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.

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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

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o Carbon nanotubes have conductive properties

ranging from excellent conduction to good

insulation.

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Molecular Transistors

Molecular Rectifier

Molecular Switch

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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.

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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.

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Molecular diode

structure

Schematic molecular

model

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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.

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Molecular logic OR gate

Molecular logic AND gate

Molecular logic XOR gate

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Circuit diagram Schematic diagram

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Circuit diagram Schematic diagram

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Circuit diagram Schematic diagram

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The developments in molecular electronic devices

with the solid-state TSRAM design to propose

molecular electronic implementations of TSRAM.

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Size

Power

Assembly

Manufacturing Cost

Low Temperature Manufacturing

Synthetic flexibility

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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.

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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.

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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.

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