title: Deep-ultraviolet solar-blind photoconductivity of individual gallium oxide nanobelts.
abstract: We designed solar-blind deep-ultraviolet semiconductor photodetectors using individual Ga2O3 nanobelts. The photoconductive behavior was systematically studied. The photodetectors demonstrate high selectivity towards 250 nm light, fast response times of less than 0.3 s, and a large photocurrent to dark current ratio of up to 4 orders of magnitude. The photoresponse parameters such as photocurrent, response time, and quantum efficiency depend strongly on the intensity of light, the detector environment, and the nanobelt size. The photoresponse mechanism was discussed, which was mainly attributed to the band bending, surface traps, and distribution of traps in the bandgap. Present Ga2O3 nanobelts can be exploited for future applications in photo sensing, light-emitting diodes, and optical switches.
authors.affiliation: International Center for Materials Nanoarchitectonics (MANA), National Institute for Materials Science (NIMS), Namiki 1-1, Tsukuba, Ibaraki 305-0044, Japan. Li.Liang@nims.go.jp
authors.forename: Liang
authors.initials: L
authors.lastname: Li
authors.forename: Erwin
authors.initials: E
authors.lastname: Auer
authors.forename: Meiyong
authors.initials: M
authors.lastname: Liao
authors.forename: Xiaosheng
authors.initials: X
authors.lastname: Fang
authors.forename: Tianyou
authors.initials: T
authors.lastname: Zhai
authors.forename: Ujjal K
authors.initials: UK
authors.lastname: Gautam
authors.forename: Alois
authors.initials: A
authors.lastname: Lugstein
authors.forename: Yasuo
authors.initials: Y
authors.lastname: Koide
authors.forename: Yoshio
authors.initials: Y
authors.lastname: Bando
authors.forename: Dmitri
authors.initials: D
authors.lastname: Golberg
mesh_terms: D003217:Conductometry / Q000295:instrumentation*; D004867:Equipment Design; D019544:Equipment Failure Analysis; D005708:Gallium / Q000737:chemistry* / Q000528:radiation effects; D008027:Light; D049329:Nanostructures / Q000737:chemistry* / Q000528:radiation effects*; D010783:Photometry / Q000295:instrumentation*; D012993:Solar Energy; D014466:Ultraviolet Rays
chemical_list: C038863:gallium oxide; D005708:Gallium