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- Title
Multi-barrier field-emission behavior in PBTTT thin films at low temperatures.
- Authors
Kang, Evan S. H.; Kim, Eunseong
- Abstract
We investigated the low-temperature transport mechanism for poly[2,5-bis(3-alkylthiophen-2-yl)thieno(3,2-b)thiophene] (PBTTT). The temperature-dependent transport behavior was studied by varying the drain-source electric field and gate bias. The results suggest that low-temperature charge transport is dominated by direct tunneling at low electric fields, while field emission is prevailing for high electric fields with high carrier densities. However, the obtained barrier heights are remarkably greater than expected in a conventional field emission. We propose a simplified model of field emission through quasi-one-dimensional path with multiple barriers which shows good agreement with the results more clearly. Field emission across the domain boundaries may assist in overcoming the transport barriers induced by the interchain disorder, which results in the weak temperature dependence of conductivities and nonlinear current-voltage relation at low temperatures.
- Subjects
THIOPHENES; POLYMER films; CHARGE transfer; LOW temperatures; CURRENT-voltage characteristics
- Publication
Scientific Reports, 2015, p8396
- ISSN
2045-2322
- Publication type
Article
- DOI
10.1038/srep08396