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Scanning-tunneling spectroscopy on conjugated polymer films

Published online by Cambridge University Press:  15 February 2011

M. Kemerink ,
S.F. Alvarado ,
P.M. Koenraad ,
R.A.J. Janssen ,
H.W.M. Salemink  and
J.H. Wolter
M. Kemerink
Affiliation:
Depts. of Applied Physics and Chemical Engineering, Eindhoven University of Technology, P.O. Box 513, 5600 MB, Eindhoven, The Netherlands
S.F. Alvarado
Affiliation:
IBM Zurich Research Laboratory, Säumerstrasse 4, CH-8803, Rüschlikon, Switzerland
P.M. Koenraad
Affiliation:
COBRA Inter-University Research Institute, Eindhoven University of Technology, P.O. Box 513, 5600 MB, Eindhoven, The Netherlands
R.A.J. Janssen
Affiliation:
Depts. of Applied Physics and Chemical Engineering, Eindhoven University of Technology, P.O. Box 513, 5600 MB, Eindhoven, The Netherlands
H.W.M. Salemink
Affiliation:
COBRA Inter-University Research Institute, Eindhoven University of Technology, P.O. Box 513, 5600 MB, Eindhoven, The Netherlands
J.H. Wolter
Affiliation:
COBRA Inter-University Research Institute, Eindhoven University of Technology, P.O. Box 513, 5600 MB, Eindhoven, The Netherlands
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Abstract

Scanning-tunneling spectroscopy experiments have been performed on conjugated polymer films and have been compared to a three-dimensional numerical model for charge injection and transport. It is found that field enhancement near the tip apex leads to significant changes in the injected current, which can amount to more than an order of magnitude, and can even change the polarity of the dominant charge carrier. As a direct consequence, the single-particle band gap and band alignment of the organic material can be directly obtained from tip height-voltage (z-V) curves, provided that the tip has a sufficiently sharp apex.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 771: Symposium L – Organic and Polymeric Materials and Devices , 2003 , L4.3
Copyright
Copyright © Materials Research Society 2003

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