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Title: Photoresponse in thin films of WO{sub 3} grown by pulsed laser deposition

We report, the photoresponse behaviour of Tungsten trioxide (WO{sub 3}) films of different surface morphology, grown by using pulsed laser deposition (PLD). The Growth parameters for PLD were changed for two substrates SiO{sub 2}/Si (SO) and SrTiO{sub 3} (STO), such a way which, result nanocrystalline film on SO and needle like structured film on STO. The photoresponse is greatly modified in these two films because of two different surface morphologies. The nanocrystalline film (film on SO) shows distinct photocurrent (PC) ON/OFF states when light was turned on/off, the enhancement of PC is ∼27%. Whereas, the film with needle like structure (film on STO) exhibits significantly enhanced persistent photocurrent even in light off condition, in this case, the enhancement of PC ∼ 50% at room temperature at lowest wavelength (λ = 360 nm) at a nominal bias voltage of 0.1 V.
Authors:
 [1] ;  [2] ; ;  [1]
  1. Unit for Nanoscience, Department of Condensed Matter Physics and Material Sciences, S. N. Bose National Centre for Basic Sciences, Kolkata (India)
  2. (India)
Publication Date:
OSTI Identifier:
22300030
Resource Type:
Journal Article
Resource Relation:
Journal Name: Applied Physics Letters; Journal Volume: 104; Journal Issue: 23; Other Information: (c) 2014 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; CRYSTALS; ELECTRIC POTENTIAL; ENERGY BEAM DEPOSITION; LASER RADIATION; NANOSTRUCTURES; PULSED IRRADIATION; SILICON; SILICON OXIDES; STRONTIUM TITANATES; SUBSTRATES; SURFACES; TEMPERATURE RANGE 0273-0400 K; THIN FILMS; TUNGSTATES; TUNGSTEN OXIDES; VISIBLE RADIATION; WAVELENGTHS