title: Ultrahigh quantum efficiency of CuO nanoparticle decorated In2Ge2O7 nanobelt deep-ultraviolet photodetectors.
abstract: Although there has been significant progress in the fabrication and performance optimization of 1-D nanostructure-based deep-ultraviolet photodetectors, it is still a challenge to develop an effective device with high performance characteristics, such as high photocurrent-dark current ratio and high quantum efficiency. Herein, an efficient and simple method to fabricate high performance CuO nanoparticle decorated In(2)Ge(2)O(7) nanobelt deep-ultraviolet photodetectors is presented. A CuO coated In(2)Ge(2)O(7) nanobelt based photodetector showed very high responsivity (7.34 × 10(5) A W(-1)) and high quantum efficiency (3.5 × 10(6)). The underlying mechanism is proposed to be the formation of p-n heterojunctions between decorated nanoparticles and nanobelts, which enhances the spatial separation of photogenerated electrons and holes. This study opens up a new horizon for creation of novel photodetectors with high quantum efficiency.
authors.affiliation: International Center for Materials Nanoarchitectonics (WPI-MANA), National Institute for Materials Science (NIMS), 1-1 Namiki, Tsukuba, Ibaraki 305-0044, Japan. wei.tian@nims.go.jp
authors.forename: Wei
authors.initials: W
authors.lastname: Tian
authors.forename: Chunyi
authors.initials: C
authors.lastname: Zhi
authors.forename: Tianyou
authors.initials: T
authors.lastname: Zhai
authors.forename: Xi
authors.initials: X
authors.lastname: Wang
authors.forename: Meiyong
authors.initials: M
authors.lastname: Liao
authors.forename: Songlin
authors.initials: S
authors.lastname: Li
authors.forename: Shimou
authors.initials: S
authors.lastname: Chen
authors.forename: Dmitri
authors.initials: D
authors.lastname: Golberg
authors.forename: Yoshio
authors.initials: Y
authors.lastname: Bando