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16 September 2011 Impedance spectroscopy for pentacene field-effect transistor: channel formation process in transistor operation
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Abstract
The carrier behaviors in pentacene based organic field-effect transistor (OFET) were investigated by impedance spectroscopy measurement (IS). We clearly observed the carrier injection from the electrode and accumulation at the pentacene/insulator interface. We propose the measurement circuit for IS in transistor operation by using battery source for drain voltage. In this method, an additional structure where capacitance gradually increases is observed between injection and accumulation processes. From the comparison this result and the analyzed curve which reflects the injection properties from the electrode, we conclude that this additional structure originates from the charge sheet spreading into channel region. This technique enables us to observe the carrier injection to the channel region and investigate the charge sheet formation from off-state to on-state and vice versa of OFETs.
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Yuya Tanaka, Yutaka Noguchi, Michael Kraus, Wolfgang Brütting, and Hisao Ishii "Impedance spectroscopy for pentacene field-effect transistor: channel formation process in transistor operation", Proc. SPIE 8117, Organic Field-Effect Transistors X, 811713 (16 September 2011); https://doi.org/10.1117/12.893685
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