Effects of polarized organosilane self-assembled monolayers on organic single-crystal field-effect transistors
J. Takeya, T. Nishikawa, T. Takenobu, S. Kobayashi, C. Goldmann, C. Krellner, T. Shimoda, T. Mitani, Y Iwasa, B. Batlogg
Abstract
The surface conductivity is measured by a four-probe technique for pentacene and rubrene single-crystals laminated on polarized and nearly unpolarized molecular monolayers with application of perpendicular electric fields. The polarization of the self-assembled monolayers (SAMs) shifts the threshold gate voltage, while maintaining a very low subthreshold swing of the single-crystal devices (0.11 V/decade). The results, excluding influences of parasitic contacts and grain boundaries, demonstrate SAM-induced nanoscale charge injection up to ~1012 cm-2 at the surface of the organic single crystals.
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