Abstract

We have investigated the temperature dependence of the fast component of the picosecond transient photoconductivity in highly oriented trans-polyacetylene films using a 30-ps pulse at 530 nm from a mode-locked YAG laser. The fast photoresponse was measured for two configurations parallel and perpendicular to the stretched direction. Only when the dc field is parallel to the stretched direction does the fast response become temperature independent. For current flow perpendicular to the stretched direction, the fast response decreased with temperature from 300 to 200 K and was constant below 200 K. The present experimental results are discussed on the basis of the existing model for the photogeneration of the charged carriers and their motion in polymeric semiconductors.

© 1988 Optical Society of America