Photocarrier creation in one dimension

Abstract

Abstract Experimental results, and theoretical discussion, are presented on photocarrier creation in large single crystals of a conjugated polymer: the bis(p-toluene sulphonate) ester of 2,4-hexadiyne-1,6-diol. The quantum efficiency for carrier creation as a function of photon energy is found absolutely. The probability φ of carrier pairs avoiding geminate recombination is characteristic of a one-dimensional system, and well described by a theory due originally to Onsager. φ is linear in field at low fields, going over to Poole–Frenkel–Schottky variation at high fields. φ is exponentially dependent on temperature, with an activation energy depending on field, and on the mechanism of carrier creation.