Photocurrent transient spectroscopy: Measurement of the density of localized states in a -As2Se3

Abstract

Measurements of transient photoinduced optical absorption in a-As2Se3 show that carriers thermalize within a distribution of localized states in the band gap. Photocurrent as well as photoinduced optical absorption transients are explained in a unified way with the multiple-trapping mechanism. Under such circumstances, transient photoconductivity provides a spectroscopy of the density of localized states. © 1981 The American Physical Society.