الفهرس | Only 14 pages are availabe for public view |
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. |