Multi-barrier field-emission behavior in PBTTT thin films at low temperatures

Cited 8 time in webofscience Cited 0 time in scopus
  • Hit : 362
  • Download : 241
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.
Publisher
NATURE PUBLISHING GROUP
Issue Date
2015-02
Language
English
Article Type
Article
Citation

SCIENTIFIC REPORTS, v.5, pp.8396

ISSN
2045-2322
DOI
10.1038/srep08396
URI
http://hdl.handle.net/10203/195552
Appears in Collection
PH-Journal Papers(저널논문)
Files in This Item
8396.pdf(1.21 MB)Download
This item is cited by other documents in WoS
⊙ Detail Information in WoSⓡ Click to see webofscience_button
⊙ Cited 8 items in WoS Click to see citing articles in records_button

qr_code

  • mendeley

    citeulike


rss_1.0 rss_2.0 atom_1.0