Non-steady-state photovoltage in crystals with long photoconductivity relaxation times

The effect of non-steady-state photovoltage in photoconductive crystals for high excitation frequencies is discussed. The theoretical analysis based on the widely accepted model of a photoconductor with one partially compensated donor level and a finite photoelectron lifetime is in reasonable agreement with the experiments on cubic BSO crystals. Average lifetimes of photocarriers in the samples were estimated to be tau =10^-4 s for lambda =442 nm and T=3*10^-6 s for lambda =663 nm.