Green electroluminescence from CdS–CuGaS2 heterodiodes

Abstract
Heterodiodes have been prepared by vapor‐deposition expitaxy of n‐type CdS on p‐type CuGaS2. Typical diodes emit green light under forward bias with external quantum efficiencies of 0.1% at 77 °K and 0.001% at room temperature. The radiative recombination results from electron injection into the CuGaS2.