الفهرس 
Chapter I: IntroductionOnly 14 pages are availabe for public view
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Abstract
The silicon based electronics becomes no longer “Almost” in line with
our time needs of extremely small scale, which push us to search for
replacements for silicon based electronics, which emphasis in the use of
extremely small electronic devices based on organic molecules as a
functional unit in the next generation of nanoscale electronic devices. For
this we payed our attention toward thiophene as a base of molecular
electronic devices. Therefore this study investigates the electrical
conductivity of diblock molecular junction consisting of donor part of
dithiophene rings and acceptor part of dicyclopentadiene with different
hetero atoms incorporate with in the ring.
This thesis consists of three main chapters:
CHAPTER I: Introduction
This chapter gives a literature survey about molecular electronics. In this
context, a brief history about the begin of molecular electronics era were
presented, starting from the out of box thoughts of Richard Feynman to
Moore’s law and the tools that make these ideas come true. Then we
presented the true beginning of molecular electronic era and the needs that
make us turn to molecular electronics instead of traditional one. In addition,
some examples of organic molecular components such as molecular
rectifiers, switches, transistors, and molecular wires have been discussed.
The most common experimental methods used in forming and studying
molecular junctions such as mechanically controllable break-junctions
(MCBJ) and scanning tunneling microscope (STM) have been reported.
Also some chemical properties that could be observed with in molecular
electronic system such as negative differential resistance (NDR) and
Molecular rectification with its probable mechanism were discussed.