Unusual Thermoelectric Behavior Indicating a Hopping to Bandlike Transport Transition in Pentacene
2012 (English)In: Physical Review Letters, ISSN 0031-9007, E-ISSN 1079-7114, Vol. 109, no 1, 016601Article in journal (Refereed) Published
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.
Place, publisher, year, edition, pages
American Physical Society , 2012. Vol. 109, no 1, 016601
IdentifiersURN: urn:nbn:se:liu:diva-118142DOI: 10.1103/PhysRevLett.109.016601ISI: 000306323900012OAI: oai:DiVA.org:liu-118142DiVA: diva2:813738
Funding Agencies|Dutch Technology Foundation STW; applied science division of NWO; Technology Programme of the Ministry of Economic Affairs (VIDI) 2015-05-252015-05-222015-06-04