Ionization Waves in ZNS

Abstract

Ionization waves, analogous to positive column of gaseous plasma, are shown to occur in ZnS. This is demonstrated with a model in which a single type of carrier (electron) impact ionizes a deep level trap in ZnS. The no‐local nature of impact ionization is described using lucky drift theory.Ionization waves were discovered by using our numerical simulation model and were seen to arise as a consequence of the non‐local nature of the impact ionization process. This is contrast to the prediction of the local‐impact ionization theory. Under certain conditions space‐charge striations are produced and a NDR occurs for some film thicknesses.