Semiconductor properties of crystalline anthracene. Competition of electron and hole photoinjection by redox electrolytes

Abstract

Electron photocurrents have been measured with a number of solution photoinjectors. A new set of electrode potentials for solid anthracene is used to account for the pH dependence of electron as compared with hole photocurrents and the absence of limiting values for the former, in terms of the reducibility and oxidisability of anthracene and the relative probabilities of charge reversion to the electrolyte injectors. The magnitudes of electron currents can in most cases be correlated with change-transfer properties of the injectors or heavy atom spin-orbit effects on intersystem crossing.