Nano Archive

Interfacial charge transfer in nanoscale polymer transistors

Worne, Jeffrey H. and Giridharagopal, Rajiv and Kelly, Kevin F. and Natelson, Douglas (2008) Interfacial charge transfer in nanoscale polymer transistors. Nano Research, 1 (4). pp. 341-350.

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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.

Item Type:Article
Uncontrolled Keywords:Organic semiconductors - band alignment - charge transfer - organic field-effect transistor - scanning tunneling microscopy
Subjects:Analytical Science > Microscopy and probe methods
Physical Science > Nanoelectronics
Engineering > Nanotechnology applications in ICT
ID Code:8842
Deposited By:IoN
Deposited On:23 Apr 2010 12:15
Last Modified:23 Apr 2010 12:15

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