Temperature dependence of the photoluminescence in a-Si:H and a-As2S3

Abstract Temperature dependence of time-resolved luminescence spectra was measured for a -Si:H and a -As 2 S 3 to investigate thermalization processes of electron-hole pairs in the band tail. The shift of the luminescence peak as a function of temperature shows that the thermalization of electron-hole pairs in band tail states can be described by hopping rather than with the multiple-trapping model.