Journal
PHYSICAL REVIEW LETTERS
Volume 109, Issue 1, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.109.016601
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Funding
- Dutch Technology Foundation STW
- applied science division of NWO
- Technology Programme of the Ministry of Economic Affairs (VIDI) [07575]
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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 similar to 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.
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