Journal
APPLIED PHYSICS LETTERS
Volume 91, Issue 24, Pages -Publisher
AMER INST PHYSICS
DOI: 10.1063/1.2824845
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We report on charge transport in organic field-effect transistors based on poly(2,5-bis(3-tetradecylthiophen-2-yl)thieno[3,2-b]thiophene) as the active polymer layer with saturation field-effect mobilities as large as 1 cm(2) V-1 s(-1). This is achieved by employing Pt instead of the commonly used Au as the contacting electrode and allows for a significant reduction in the metal/polymer contact resistance. The mobility increases as a function of decreasing channel length, consistent with a Poole-Frenkel model of charge transport, and reaches record mobilities of 1 cm(2) V-1 s(-1) or more at channel lengths on the order of few microns in an undoped solution-processed polymer cast on an oxide gate dielectric. (c) 2007 American Institute of Physics.
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