Simple fabrication and improved photoresponse of ZnO-Cu_2O core-shell heterojunction nanorod arrays

摘要

ZnO-Cu_2O core-shell nanorod heterostructures were synthesized by a proposed solution process. High-resolution transmission electron microscopy shows the CU_2O nanoshells with a thickness of around 10 nm are constructed of single-crystalline nanoparticles with a diameter of around 5 nm capped on the surface of ZnO nanorods. Photoluminescence measurements show that the green emission of ZnO nanorods was eliminated by capping with Cu_2O nanoshells. An improved photoresponse of ZnO-Cu_2O heterojunction nanorods with ultrafast and extended high sensitivity from UV to the visible range is demonstrated. These heterostructures are promising for photosensing and solar energy applications.