Ambipolar organic thin-film transistors using C60 /pentacene structure: Characterization of electronic structure and device property

S. J. Kang, Y. Yi, C. Y. Kim, K. Cho, J. H. Seo, M. Noh, K. Jeong, K. H. Yoo, C. N. Whang

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Abstract

We fabricated ambipolar organic thin-film transistors (OTFTs) using C60 and pentacene. The electronic structure of the interface was investigated by using ultraviolet photoelectron spectroscopy and x-ray photoelectron spectroscopy. The magnitude of the interface dipole and the band bendings at the interface was determined, and the complete energy level diagram for C60 on pentacene (C60 /pentacene) was obtained. The lowered band offsets, due to the enhanced charge redistribution in C60 /pentacene relative to pentacene on C60, are favorable for the ambipolar OTFTs. The measured field-effect mobilities were 0.017 cm2 V s and 0.007 cm2 V s for the p -channel and the n -channel operations, respectively. The threshold voltages were -2 V for the p channel and 15.6 V for the n channel, comparable to those of unipolar OTFTs using C60 or pentacene.

Original languageEnglish
Article number233502
Pages (from-to)1-3
Number of pages3
JournalApplied Physics Letters
Volume87
Issue number23
DOIs
Publication statusPublished - 2005 Dec 12

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All Science Journal Classification (ASJC) codes

  • Physics and Astronomy (miscellaneous)

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