Ultrathin Amorphous Gallium Oxide Vacuum Ultraviolet Photodetectors
Samuel H. Amsterdam, Anil U. Mane, Alex B. F. Martinson
Abstract
Gallium oxide is demonstrated to be an effective material for the detection of vacuum-ultraviolet (VUV) photons. Nanometer thick films of amorphous gallium oxide deposited by atomic layer deposition are found to exhibit large absorptivity in the VUV region 120–200 nm. We leverage the strong absorption of the ultrathin film to fabricate self-powered Schottky diode photodetectors using graphene as a VUV-transparent electrode. Responsivity throughout the VUV is calculated, significantly extending the demonstrated spectral range of gallium oxide-based photodetectors.
Topics & Concepts
Materials scienceResponsivityOptoelectronicsPhotodetectorUltravioletAmorphous solidOxideGrapheneGalliumSchottky diodeDiodeOpticsNanotechnologyChemistryMetallurgyPhysicsOrganic chemistryGa2O3 and related materialsZnO doping and propertiesGaN-based semiconductor devices and materials