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Title: High-performing visible-blind photodetectors based on SnO{sub 2}/CuO nanoheterojunctions

We report on the significant performance enhancement of SnO{sub 2} thin film ultraviolet (UV) photodetectors (PDs) through incorporation of CuO/SnO{sub 2} p-n nanoscale heterojunctions. The nanoheterojunctions are self-assembled by sputtering Cu clusters that oxidize in ambient to form CuO. We attribute the performance improvements to enhanced UV absorption, demonstrated both experimentally and using optical simulations, and electron transfer facilitated by the nanoheterojunctions. The peak responsivity of the PDs at a bias of 0.2 V improved from 1.9 A/W in a SnO{sub 2}-only device to 10.3 A/W after CuO deposition. The wavelength-dependent photocurrent-to-dark current ratio was estimated to be ∼592 for the CuO/SnO{sub 2} PD at 290 nm. The morphology, distribution of nanoparticles, and optical properties of the CuO/SnO{sub 2} heterostructured thin films are also investigated.
Authors:
 [1] ;  [2] ;  [1] ;  [2] ; ; ;  [3] ;  [4] ; ;  [1]
  1. Materials Science and Engineering Division, Material Measurement Laboratory, National Institute of Standards and Technology, Gaithersburg, Maryland 20899 (United States)
  2. (United States)
  3. Department of Electrical and Computer Engineering, Johns Hopkins University, Baltimore, Maryland 21218 (United States)
  4. Semiconductor and Dimensional Metrology Division, Physical Measurement Laboratory, National Institute of Standards and Technology, Gaithersburg, Maryland 20899 (United States)
Publication Date:
OSTI Identifier:
22486224
Resource Type:
Journal Article
Resource Relation:
Journal Name: Applied Physics Letters; Journal Volume: 107; Journal Issue: 24; 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; 77 NANOSCIENCE AND NANOTECHNOLOGY; ABSORPTION; COPPER OXIDES; CURRENTS; DEPOSITION; DISTRIBUTION; ELECTRON TRANSFER; EQUIPMENT; HETEROJUNCTIONS; MORPHOLOGY; NANOPARTICLES; NANOSTRUCTURES; OPTICAL PROPERTIES; PERFORMANCE; PHOTODETECTORS; SIMULATION; SPUTTERING; THIN FILMS; TIN OXIDES; ULTRAVIOLET RADIATION; WAVELENGTHS