Lifetime of electrons at the surface of sulfur and at the interface Te — Sulfur

By means of the method of transit time measurements we have injected electrons from the surface of a sulfur single crystal using uv light or from a Te contact using visible (λ = 520 nm) light. Using the model of Simhony and Gorelik we have made the analysis of the results in order to obtain values of the lifetime of electrons either at the surface of sulfur or at the interface Te-sulfur. We obtained values of the lifetime i in the range 1–6 msec. for both cases, from which we conclude that the lifetime is governed by processes taking place in the sulfur crystal.