Interfacial charge transfer in nanoscale polymer transistors |
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Authors: | Jeffrey H Worne Rajiv Giridharagopal Kevin F Kelly Douglas Natelson |
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Affiliation: | (1) Department of Electrical and Computer Engineering, Rice University, 6100 Main St., Houston, TX 77005, USA;(2) Department of Physics and Astronomy, Rice University, 6100 Main St., Houston, TX 77005, USA |
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Abstract: | Interfacial charge transfer plays an essential role in establishing the relative alignment of the metal Fermi level and the
energy bands of organic semiconductors. While the details remain elusive in many systems, this charge transfer has been inferred
in a number of photoemission experiments. We present electronic transport measurements in very short channel (L < 100 nm) transistors made from poly(3-hexylthiophene) (P3HT). As channel length is reduced, the evolution of the contact
resistance and the zero gate voltage conductance are consistent with such charge transfer. Short channel conduction in devices
with Pt contacts is greatly enhanced compared to analogous devices with Au contacts, consistent with charge transfer expectations.
Alternating current scanning tunneling microscopy (ACSTM) provides further evidence that holes are transferred from Pt into
P3HT, while much less charge transfer takes place at the Au/P3HT interface.
This article is published with open access at Springerlink.com |
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Keywords: | Organic semiconductors band alignment charge transfer organic field-effect transistor scanning tunneling microscopy |
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