Seminars Archive

Towards molecular electronics:structural, morphological, electronic and transport properties of organic semiconductors.

Abstract
The investigation and the understanding of the structural, electronic and transport properties of organic molecules is of great interest for their potential application in nano and microelectronics research. The possibility to obtain low cost, flexible, nano-sized devices is the main goal of the large field of molecular electronics and many molecules and applications have been proposed and studied with experimental and theoretical efforts in recent years. However, a thorough understanding is still far to come and there are many issues to address both from the technological and the fundamental point of view. Motivated by the various properties that organic semiconductors reveal, we report in this talk the analysis of some different factors that influence the transport properties of these materials, choosing as case systems Pentacene, and Pentacene-Quinone. First, we will dedicate our attention to the investigation of the thin film phase of Pentacene. We\'ll show how the transport and electronic properties can be strongly affected by the molecular crystallographic arrangement and by external doping. Then, we\'ll move our attention to the typical chemical impurity of Pentacene, namely 6,13 Pentacenequinone, exploring its structural, morphological, optical and electronic properties. Owed to its dielectric and optical properties 6,13 Pentacenequinone has recently attracted the attention of researchers and we will here explore some potential applications of this molecule. Finally, we will report on the effects related to the metal/organic interface at the electrodes. In order to exploit this issue we studied the contact resistance in rubrene and pentacene single crystal Field Effect Transistors by means of scaling experiments, rationalizing the results in the framework of a classical Schottky model.