Epitaxial lift-off of single crystalline CuI thin films

Abstract

Thin films of the transparent, p-type semiconductor copper iodide (CuI) were grown by pulsed laser deposition on SrF₂(111) with water soluble sodium bromide (NaBr) sacrificial layers. The resulting epitaxial CuI thin films are single crystalline and offer reduced surface roughness compared to epitaxial CuI grown with rotational domains on other templates. The CuI thin films were transferred onto glass using epoxy/glue and dissolution of the NaBr in a water-vapor atmosphere.