Dynamics of photo-transport in a-As2Se3: ac loss approach

Abstract The relaxation time deduced experimentally from the ac response in amorphous As2Se3 is not consistent with the theoretical prediction of dielectric relaxation or hop-down motion in localized tail states (e.g. ≈10 −8 s at 100 K). It is suggested that some other mechanisms, e.g. defect-related hopping, should be involved in the ac photo-response in a-As2Se3. Validity of the physical parameters deduced from the dc and ac photoconductivities are discussed.