skip to main content

Title: Array of Cu{sub 2}O nano-columns fabricated by oblique angle sputter deposition and their application in photo-assisted proton reduction

Nano-columnar arrays of Cu{sub 2}O were grown by the oblique angle sputter deposition technique based on the self-shadowing principle. The as-grown nano-columnar samples are oriented along (111) direction, and they are highly transmitting in the visible range with a low reflectance. In this work, we show the photo-electrochemical activity of nano-columnar array of Cu{sub 2}O, which shows a higher (∼25%) photocurrent density and a two-fold enhancement in the incident-to-photon conversion efficiency as compared to continuous thin film of Cu{sub 2}O in photo-assisted proton reduction type reaction. The improvement in electrochemical activity of nano-columnar Cu{sub 2}O photocathode can be attributed to the change in morphology, crystal structure, as well as electrical property, which shows a higher degree of band bending, increased donor carrier (e−) density and lower width of space charge region as revealed by capacitance measurements and Mott-Schottky analysis.
Authors:
; ;  [1] ;  [2] ;  [1] ; ;  [3]
  1. Colloids and Materials Chemistry Department, CSIR-Institute of Minerals and Materials Technology, Bhubaneswar 751013 (India)
  2. (CSIR-AcSIR), New Delhi (India)
  3. Department of Condensed Matter Physics and Materials Science, Tata Institute of Fundamental Research, Mumbai 400005 (India)
Publication Date:
OSTI Identifier:
22412827
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Applied Physics; Journal Volume: 117; Journal Issue: 2; 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; CAPACITANCE; CHARGE CARRIERS; COMPARATIVE EVALUATIONS; COPPER OXIDES; CRYSTAL GROWTH; CRYSTAL STRUCTURE; DEPOSITION; ELECTROCHEMISTRY; MORPHOLOGY; NANOSTRUCTURES; PHOTOCATHODES; PHOTONS; SPACE CHARGE; SPUTTERING; THIN FILMS