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Proceedings Paper

Hysteresis in pentacene-based organic thin-film transistors
Author(s): Gong Gu; Michael G. Kane
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Paper Abstract

Memory effects are commonly seen in organic thin-film transistor (OTFT) characteristics. In the absence of memory effects associated with the gate dielectric, the hysteresis in p-channel pentacene-based OTFTs, as measured in air and under illumination, was found to be dominated by trapped electrons, rather than trapped holes, in the semiconductor. The responsible acceptor type traps have very long lifetime. The immobile, previously stored negative charge requires extra holes to balance it, resulting in early establishment of the channel and extra drain current. This model is unique in that it discusses the majority carrier population influenced by trapped charge opposite in sign to the majority carriers in a simple electrostatic manner, to explain history dependence. The model was supported by drain current transient decay data. This memory effect is ambient and illumination sensitive. We studied the presence or absence of this effect under various ambient and illumination conditions, and found the responsible acceptor type traps mostly extrinsic and their formation reversible. Efforts were taken in the quantitative analysis to exclude the bias stress effect from the memory effect due to the charged acceptors.

Paper Details

Date Published: 19 September 2006
PDF: 13 pages
Proc. SPIE 6336, Organic Field-Effect Transistors V, 63360H (19 September 2006); doi: 10.1117/12.679661
Show Author Affiliations
Gong Gu, Sarnoff Corp. (United States)
Michael G. Kane, Sarnoff Corp. (United States)

Published in SPIE Proceedings Vol. 6336:
Organic Field-Effect Transistors V
Zhenan Bao; David J. Gundlach, Editor(s)

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