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Published in

American Physical Society, Physical Review Letters, 1(109), 2012

DOI: 10.1103/physrevlett.109.016601

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Unusual Thermoelectric Behavior Indicating a Hopping to Bandlike Transport Transition in Pentacene

Journal article published in 2012 by W. Chr Germs, K. Guo, R. A. J. Janssen, M. Kemerink ORCID
This paper is available in a repository.
This paper is available in a repository.

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Abstract

An unusual increase in the Seebeck coefficient with increasing charge carrier density is observed in pentacene thin film transistors. This behavior is interpreted as being due to a transition from hopping transport in static localized states to bandlike transport, occurring at temperatures below ∼250  K. Such a transition can be expected for organic materials in which both static energetic disorder and dynamic positional disorder are important. While clearly visible in the temperature and density dependent Seebeck coefficient, the transition hardly shows up in the charge carrier mobility.