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A Classic Molecular Semiconductor Revisited: New Aspects of Growth Mode and Conduction Characteristics in Thin Films of Phthalocyaninatozinc (PcZn)

Published online by Cambridge University Press:  26 February 2011

Harry Brinkmann  and
Derck Schlettwein
Harry Brinkmann
Affiliation:
[email protected], Justus-Liebig-Universität Giessen, Institute of Applied Physics, Heinrich-Buff-Ring 16, Giessen, D- 35392, Germany
Derck Schlettwein
Affiliation:
[email protected], Justus-Liebig-Universität Giessen, Institute of Applied Physics, Heinrich-Buff-Ring 16, Giessen, D- 35392, Germany
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Abstract

PcZn as a well known organic semiconductor received new examination of its growth mode in thin films and reactions to oxygen exposure. PcZn thin films were grown on glass and polyimide substrates by physical vapor deposition. Ag electrodes had been deposited by a sputter process to allow electrical contact to the films. Conductivity measurements were performed in-situ during the growth of films under high vacuum conditions. Characteristic current peaks were observed and explained by a Stranski-Krastanov growth mode. Current voltage characteristics revealing space charge limitation could be obtained beginning in the monolayer range. For pristine films n-type conduction was observed. Following deposition an increase of the conductivity was measured, caused by changes of the film structure. Ripening under high vacuum conditions could be separately discussed from doping effects caused by oxygen exposure which led to the well- known p-type characteristics of PcZn.

Keywords

thin filmorganicsemiconducting
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 965: Symposium S – Organic Electronics – Materials, Devices and Applications , 2006 , 0965-S06-25
Copyright
Copyright © Materials Research Society 2007

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References

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