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Scanning Kelvin probe microscopy (SKPM) has been used to simultaneously obtain high-resolution topographical and potential images of pentacene organic thin-film transistors (OTFTs) during device operation. SKPM images of OTFTs show large potential drops at the source with the magnitude dependent on contact metallurgy and relatively small potential drops at grain boundaries in polycrystalline pentacene films.
Nichols et al. (Thu,) studied this question.