OPTICAL-PROPERTIES AND LONG-LIVED CARRIER GENERATION EFFICIENCY IN ORIENTED POLYACETYLENE

A simple tight - binding model extended to include the zig-zag structu re of the chains and the interchain electronic coupling has been used to account for the dispersion of the real and imaginary part of the di electric function of polyacetylene as derived from optical measurement s. Intrachain and interchain contributions to the perpendicular absorp tion coefficient have been evaluated. It has been found that while int erchain effects have a relatively small impact on the optical properti es, they play a major role in determining the photogeneration rate of long-lived carriers in oriented trans-(CH)x.