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Effects of Humidity and Heat on the Conductivity of Poly(3-Alkylthiophenes)

Published online by Cambridge University Press:  25 February 2011

E. Punkka ,
H. Isotalo ,
M. Ahlskog  and
H. Stubb
E. Punkka
Affiliation:
Technical Research Centre of Finland, Semiconductor Laboratory, Otakaari 7B, 02150 Espoo, Finland.
H. Isotalo
Affiliation:
Technical Research Centre of Finland, Semiconductor Laboratory, Otakaari 7B, 02150 Espoo, Finland.
M. Ahlskog
Affiliation:
Technical Research Centre of Finland, Semiconductor Laboratory, Otakaari 7B, 02150 Espoo, Finland.
H. Stubb
Affiliation:
Technical Research Centre of Finland, Semiconductor Laboratory, Otakaari 7B, 02150 Espoo, Finland.
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Abstract

The stability of the conductivity of poly(3-alkylthiophenes) has been studied in controlled environmental conditions. High humidity levels at elevated temperatures have been found to strongly influence the dedoping process. Highly FeCl3-doped samples lose their conductivity faster than lightly doped or undoped polymers. The conductivity of undoped poly(3-octylthiophene), however, initially increased by nearly two orders of magnitude as the relative humidity level was raised from 50% to 95% at 70 °C. The largest conductivity decay induced by humidity and heat was observed in thin samples. Measurements of the field-effect mobility reveal that the humidity-induced drop of the conductivity is caused by a decreasing number of active dopants, whereas heating the sample additionally results in a deterioration of the charge carrier mobility.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 247: Symposium N – Electrical, Optical, and Magnetic Properties of Organic Solid State Materials , 1992 , 753
Copyright
Copyright © Materials Research Society 1992

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References

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