Electrical Dependence of ZnS Thin Films Exposed to H 2 O

In order to study the humidity dependence of thin‐film ceramic‐substrate electroluminescent (EL) devices below the luminescence threshold, two devices were evaporated—one with a smaller average grain size in the active layer than the other. The devices were exposed to various levels of relative humidity and were electrically characterized using charge‐voltage (Q‐V) measurements. It was found that the presence of water in the active layer …