main molecular electronics.pdf
DESCRIPTION
This seminar is on molecular electronics. In this seminar i just try to clear a basic idea on this old but newly advance branch of electronic field.TRANSCRIPT
MOLELECTRONICSBy Krunal Mhatre
Guided By V.R.Chitte
MOORE'S LAW
The number of transistor that can be place on a single integrated circuit double about every two year.
Gordon E. Moore (1965)
logicElement = 2(year/1.5)
cm2
First computer Latest computer
What is molecule?
Molecule is small particle of chemical element or compound
That has the chemical properties of that element
Molecule made up of atom that are held together
EXAMPLE
MOLELECTRONICS
Molelectronics is abbreviations for MOLECULAR ELECTRONICS. It is branch of electronics in which individual molecules perform in same function as microelectronics devise such as diode.
HISTORYIn 1940 Robert Muliken and Albert Szent-Gyorgy advances the concept of
charge transfer using molecule.
In 1974 paper from Ari Aviram and Mark Ratner illustrate a theoritcal molecular rectifier.
In 1988 Aviram described a single molecule Field effect transistor.
further concept were propose by the Forrest carter which include single molecule logic gate in same year.
PRACTICALLY IMPLEMENTED
C. Joachim and J.K.Gimzewsky first experimented the conductance of single molecule on c60 molecule in IBM
In 1997 Mark Reed and co-worker add few hundred molecules
Molecular Devices
• Molecular Wire
• Molecular Diode
• Molecular Transistor
MOLECULAR WIRE
The structure of a Mo6S9-xIx
Mo atoms are blue, iodine atoms are red and sulphur atoms are green
• Rectifying diodeMOLECULAR DIODE
Forward biased condition
Reverse biased condition
rectifying diode
•Tunnelling diode
Structure of molecular resonant tunnelling diode
showing the ‘OFF’ state
showing the ‘ON’ state
MOLECULAR TRANSISTOR
ADVANTAGES Tiny
Low power consumption
Able to integrate large circuit
Re-configurable
DISADVANTAGES
Controlled fabrication within specified tolerances.
Hard experimental verification.
APPLICATION
Sensors
Displays, Energy transduction devices
Smart Material, Molecular scale transistors
Molecular Motors, Logic and memory devices
CONCLUSIONMolecular electronics clearly has the advantage of size.
Molecular systems, or systems based on small organic molecules, possess interesting and useful electronic properties.
Molecular electronics is reaching a stage of trustable and reproducible experiments.
The potential application of molecular electronics has already attracted the interest of some large corporate
THANK YOU