Journal
APPLIED PHYSICS LETTERS
Volume 88, Issue 20, Pages -Publisher
AMER INST PHYSICS
DOI: 10.1063/1.2204846
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High charge carrier densities have been realized in organic field-effect transistors based on single crystals of the organic semiconductors rubrene and tetracene using a high capacitance polymer electrolyte gate dielectric. The source-drain current was modulated by five orders of magnitude in a rubrene single-crystal organic field-effect transistor (SC-OFET) with gate voltages ranging from 0 to -3 V. A peak in the field-effect conductance was also observed in SC-OFETs at induced carrier densities of similar to 10(15) charges/cm(2). Key to successful device fabrication was the introduction of a thin, insulating spacer layer between the organic single crystal (OSC) and the polymer electrolyte gate dielectric. Further improvement of the device fabrication procedure may eliminate suspected solvent-related degradation effects and raise mobility values in these SC-OFETs, opening the door to a wide spectrum of experiments on OSCs at high charge carrier densities. (c) 2006 American Institute of Physics.
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