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Title: Coaxial Ag/ZnO/Ag nanowire for highly sensitive hot-electron photodetection

Single-nanowire photodetectors (SNPDs) are mostly propelled by p-n junctions, where the detection wavelength is constrained by the band-gap width. Here, we present a simple doping-free metal/semiconductor/metal SNPD, which shows strong detection tunability without such a material constraint. The proposed hot-electron SNPD exhibits superior optical and electrical advantages, i.e., optically the coaxial design leads to a strong asymmetrical photoabsorption and results in a high unidirectional photocurrent, as desired by the hot-electron collection; electrically the hot-electrons are generated in the region very close to the barrier, facilitating the electrical transport. Rigorous calculations predict an unbiased photoresponsivity of ∼200 nA/mW.
Authors:
; ; ; ;  [1] ;  [2]
  1. College of Physics, Optoelectronics and Energy and Collaborative Innovation Center of Suzhou Nano Science and Technology, Soochow University, Suzhou 215006 (China)
  2. (China)
Publication Date:
OSTI Identifier:
22412679
Resource Type:
Journal Article
Resource Relation:
Journal Name: Applied Physics Letters; Journal Volume: 106; Journal Issue: 8; Other Information: (c) 2015 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; DIFFUSION BARRIERS; ELECTRIC CONDUCTIVITY; ELECTRON DETECTION; ELECTRONS; ENERGY GAP; HETEROJUNCTIONS; NANOWIRES; PHOTODETECTORS; P-N JUNCTIONS; SEMICONDUCTOR MATERIALS; SILVER; WAVELENGTHS; ZINC OXIDES