A key issue in research into organic thin-film transistors (OTFTs) is low-voltage operation. In this study, we fabricated a pentacene thin-film transistor with an ultrathin layer of polyvinyl alcohol as a gate insulator, and obtained a device with excellent electrical characteristics at low operating voltages (below ). This device was found to have a field-effect mobility of , a threshold voltage of , an exceptionally low subthreshold slope of /decade, and an on/off current ratio of . This favorable combination of properties means that such OTFTs can be operated successfully at voltages below .
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