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High mobility soluble polyacene–dielectric polymer formulations - a facile approach to large area printed electronics

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OTF Ts have become increasingly more attractive for various electronic applications mainly due to potentially low cost solution processability, and potential for migration to flexible substrates. However OTF Ts cannot achieve the high switching frequency of single crystalline silicon because of the inherently lower mobility and structural disorder of organic compounds in the solid state. 6, 13 substituted pentacene’s have been the subject of intensive recent investigation attempting to combine good low cost solution processability with high performance [1]. Here we present the result of influence of film processing condition as well as formulation on thinf film transistor characeristics when a new pentacene derivative (1,4,8,11 methyl substituted 6,13 triethylsilylethynylpentacene (TMTES-Pentacene)) is used. This new molecule. shows extended pi-pi overlap when deposited from solution yielding organic thin film transistors with high and reproducible hole mobility in excess of 2 cm2/Vs with Ion/off > 107 and negligible hysteresis. It is found that OTFT performance of the organic semiconductor is retained when blended with both amorphous and crystalline side chain aromatic dielectric polymers even at volume fractions < 0.1 offering the potential for the formulation of cost effective semiconducting inks.

This talk is part of the Optoelectronics Group series.

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