Charge transport in a single-layer organic photoreceptor

Abstract Discharge kinetics of a single-layer organic photoreceptor under exposure to a semi-infinite pulse of light with wavelength λ = 780 nm have been investigated both experimentally and theoretically. The results have been obtained for various light intensities in the range I = 2 × 10 16 –5 × 10 17 quants/s m 2 and for various initial charging potentials in the range U 0 = 1150–280 V. By fitting experimental film potential kinetics by theoretical ones and taking into account the measured dependence of hole and electron mobilities on electric field strength E , it has been determined that an important role in charge transport is played by field-induced hole traps, whose density is proportional to E σ , where 2 ≥ σ ≥ 1.2. It has been also determined that photogeneration quantum yield is proportional to E r , where 2 > r ≥ 1.