Journal
APPLIED PHYSICS LETTERS
Volume 85, Issue 21, Pages 5078-5080Publisher
AMER INST PHYSICS
DOI: 10.1063/1.1826239
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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 similar to10(12) cm(-2) at the surface of the organic single crystals. (C) 2004 American Institute of Physics.
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