Showing papers by "Marc Kastner published in 1981"
TL;DR: In this article, the multiple-trapping mechanism was used to explain photo-induced optical absorption transients in a unified way with the multiple trapping mechanism, and transient photoconductivity provided a spectroscopy of the density of localized states.
Abstract: Measurements of transient photoinduced optical absorption in $a$-${\mathrm{As}}_{2}$${\mathrm{Se}}_{3}$ show that carriers thermalize within a distribution of localized states in the band gap. Photocurrent as well as photoinduced optical absorption transients are explained in a unified way with the multiple-trapping mechanism. Under such circumstances, transient photoconductivity provides a spectroscopy of the density of localized states.
332 citations
TL;DR: In this paper, the fate of carriers excited in an amorphous semiconductor by a pulse of light is described, and two processes are discussed: thermalization of carriers within a distribution of localized states, and carrier recombination.
123 citations
TL;DR: In this article, a new optical system incorporating a fast Ge photodiode has made possible the first measurements at short times of the low-energy side of the photoluminescence spectrum of $a$-${\mathrm{As}}_{2}$${\mathm{S}}_{3} ).
Abstract: A new optical system incorporating a fast Ge photodiode has made possible the first measurements at short times of the low-energy side of the photoluminescence spectrum of $a$-${\mathrm{As}}_{2}$${\mathrm{S}}_{3}$. Two photoluminescence processes are separated by their dependence on excitation energy, ${E}_{x}$. A number of observations suggest that the first step in the high-${E}_{x}$ process is the creation of delocalized excitations. The abrupt onset of this process leads to the intimation that it arises from transitions across the mobility gap.
26 citations
23 citations
11 citations