Photocarrier Generation in a One‐Dimensional solid: Polydiacetylene‐Bis(Toluenesulfonate)

Abstract

Abstract The dependence of the absolute quantum yield for intrinsic photocarrier production in PDA‐TS single crystals on temperature, electric field applied parallel and perpendicular to the polymer chain axis, nad photon energy is measured between 1.6 to 3.0 eV with polarized light. Below 190 K photon absorption leads to formation of a thermalized pair of charge carriers at mutual distance α = (116 ± 5) Å a primary quantum yield of 0.2 at 3.0 eV. Above 190 K, a( T ) decreases due to te temperature‐activted scattering. Dissociation of the carrier pair occurs only along the polymer chain and can be described by described by Onsager's theory formulated for one dimension. The spectral response indicates that the dominant 2 eV transition is of excitonic origin nd that it must be superimposed to a second strongly ionizing trasition.