TITLE OF TALK: Organic Semiconductor Devices: Potential and Challenges.
Abstract of the talk: The advent of conducting polymers opened up new avenues for exploration of novel organic materials for fabrication of a variety of electronic and optoelectronic devices. Organic semiconductors constitute a new class of materials consisting of small molecules and polymers with semiconducting properties [1]. Over the past two decades, organic semiconducting polymers like polyaniline, polythiophene, polyacetylene, polypyrrole, polyindole, polycarbazole etc. have been gaining increasing interest in the fabrication of different electronic, optoelectronic and energy storage devices. Low-cost manufacturing, easy fabrication methods compared to inorganic devices, light weight and compatibility with flexible substrates are some of the exciting features of organic semiconductor devices. Organic semiconducting polymer films can be obtained by employing chemical and electrochemical techniques. The electrochemical method is generally preferred because one can modify properties of the organic semiconducting film by changing conditions like oxidation potential, solvent concentration, deposition time, electrolyte type and deposition techniques (chronoamperometry or cyclic voltammetry). These materials have been extensively used for development of organic Schottky diodes (OSDs), organic photodiodes (OPDs), organic light-emitting diodes (OLEDs), organic field-effect-transistors (OFETs) or organic thin-film transistors (OTFTs), organic solar cells, organic quantum dots (OQDs) and memory devices. As organic semiconductors can be grown on flexible substrates these devices are quite attractive for development of flexible displays and flexible electronic circuits. It has been envisaged that OLEDs and flexible photovoltaic devices, in particular shall have a major share of global market by the end of this decade. However, there are several challenges including reliability, stability and interface issues that need to be addressed for successful deployment of these materials for the desired applications. This article reviews the state-of-the-art of electronic and optoelectronic devices based on organic semiconductors. It also focuses on various issues and challenges pertaining to these materials vis-à-vis their inorganic counterparts. Finally, the article also presents a few novel thin-film organic semiconductor devices developed in our laboratory.
References
[1] H. Shirakawa and S. Ikeda, “Infrared Spectra of Poly(acetylene),” Polymer Journal, vol. 2, pp. 231-244, 1971
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