The role of the dielectric interface in organic transistors: a combined device and photoemission study

Stadler, Philipp, Track, Anna M., Ullah, Mujeeb, Sitter, Helmut, Matt, Gebhard J., Koller, Georg, Singh, Thokchom B., Neugebauer, Helmut, Sariciftci, N. Serdar and Ramsey, Michael G. (2010) The role of the dielectric interface in organic transistors: a combined device and photoemission study. Organic Electronics, 11 2: 207-211. doi:10.1016/j.orgel.2009.10.017


Author Stadler, Philipp
Track, Anna M.
Ullah, Mujeeb
Sitter, Helmut
Matt, Gebhard J.
Koller, Georg
Singh, Thokchom B.
Neugebauer, Helmut
Sariciftci, N. Serdar
Ramsey, Michael G.
Title The role of the dielectric interface in organic transistors: a combined device and photoemission study
Journal name Organic Electronics   Check publisher's open access policy
ISSN 1566-1199
1878-5530
Publication date 2010-02
Year available 2009
Sub-type Article (original research)
DOI 10.1016/j.orgel.2009.10.017
Volume 11
Issue 2
Start page 207
End page 211
Total pages 5
Place of publication Amsterdam, Netherlands
Publisher Elsevier
Language eng
Formatted abstract
Here the device performance is shown to be directly related to the measured electronic level alignment at the dielectric interface in C60 organic field effect transistors (OFETs). We compare C60 on two dielectrics: Al2O3 and a divinyltetramethyldisiloxane-bis(benzocyclobutene) (BCB)–Al2O3 bilayer. The improved transistor performance and the lowering of the threshold voltage by 0.8 V due to the BCB interlayer are reflected in the ultra-violet photoemission data. These show a 0.8 eV difference in the work function and a concomitant shift in the C60 valence band. By following the work function the improvement is shown to be due to the dipole at the organic BCB–C60 interface.
Keyword Organic field effect transistor
Ultra-violet photoemission spectroscopy
Interface dipole
Energy level alignment
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status Non-UQ
Additional Notes Published online 29 October 2009

Document type: Journal Article
Sub-type: Article (original research)
Collection: School of Mathematics and Physics
 
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