Theoretical analysis of the photocurrent dark decay inphotorefractive media

摘要

The photocurrent dark decay in photorefractive materials isntheoretically analyzed by using two different dynamicalnapproaches-namely, the shallow traps and electron-hole transport models.nThe analysis is based on experimental results that show a doublenexponential decay of the photocurrent with short pulsed or continuousnexcitation. Expressions for the photocurrent amplitudes and decay timesnhave been derived in terms of material and excitation parameters.nSeveral dynamic behaviors are predicted for both models