What could be the Highest Hopping Mobility in Organic Thin-Film Transistors?
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What could be the Highest Hopping Mobility in Organic Thin-Film Transistors? Varsha Rani, Akanksha Sharma and Subhasis Ghosh MRS Advances / FirstView Article / July 2016, pp 1 - 6 DOI: 10.1557/adv.2016.477, Published online: 20 June 2016
Link to this article: http://journals.cambridge.org/abstract_S2059852116004771 How to cite this article: Varsha Rani, Akanksha Sharma and Subhasis Ghosh What could be the Highest Hopping Mobility in Organic Thin-Film Transistors?. MRS Advances, Available on CJO 2016 doi:10.1557/adv.2016.477 Request Permissions : Click here
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MRS Advances © 2016 Materials Research Society DOI: 10.1557/adv.2016.477
What could be the Highest Hopping Mobility in Organic Thin-Film Transistors? Varsha Rani1, Akanksha Sharma1 and Subhasis Ghosh1 1 School of Physical Sciences, Jawaharlal Nehru University, New Delhi-110067, INDIA ABSTRACT Charge transport properties of pentacene have been investigated by a joint experimental and theoretical study. The growth of pentacene on the substrates shows mainly two different polymorphic phases, a bulk phase and a thin-film phase. The thin-film phase is crucial for the charge transport in two-terminal and three-terminal devices such as organic Schottky diodes and organic thin film transistors, respectively. Experimentally, mobility in two-terminal devices is less by five orders of magnitude than that in three-terminal devices. We show here that this difference can be explained on the basis of strong electronic coupling between molecular dimers located in the ab-plane and relatively weak coupling between the planes (along the c-axis). INTRODUCTION In recent years, organic semiconductors have shown their potential as a new class of electronic materials for mainly low cost, flexibility and large area coverage [1]. One of the most important parameters to define the efficiency of these materials is the charge carrier mobility which determines the performance of organic thin-film-based devices. Mobility is found to depend on a number of parameters [2-3] including the orientation of the molecules on the substrate, relative orientation of the molecules, degree of ordering, charge carrier traps due to grain boundaries etc. Hence both the surface morphology and crystalline quality of active organic layers play a decisive role on the performance of organic semiconductor-based devices. However in many cases charge transport properties of organic thin films cannot be fully understood on the basis of only crystalline quality and surface morphology due to the complex microstructure that exists in organic thin films. Intermolecular disorder present in thin-films also limits the charge transport in two-terminal and three-terminal devices. Hence, in order to achieve a deeper understanding of the charge transport properties and electrical performance of organic semiconducto
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