INTERCHAIN PHOTOCONDUCTIVITY OF ANISOTROPIC POLARONS IN DIAGONALLY DISORDERED ORGANIC-SOLIDS

We calculate the temperature dependence of the photoconductivity sigma (omega --> 0,T) perpendicular to the chain direction of oriented trans -polyacetylenes, (CH)(x), due to photoexcited anisotropic polarons. Th e calculations are performed with the standard small polaron theory ex tended to interchain dynamics of anisotropic polarons with diagonal di sorders. The calculated sigma(T) of anisotropic polarons increases wit h the temperature in the high-T region, decreases as the temperature i s reduced in the low-T region, and is nearly T independent in the inte rmediate T region. This temperature dependence of the interchain photo conductivity is in good agreement with the previously reported photocu rrent measurements on (CH)(x).