Journal
SOLAR ENERGY MATERIALS AND SOLAR CELLS
Volume 91, Issue 12, Pages 1097-1101Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.solmat.2007.03.005
Keywords
WO3 thin films; pulsed spray pyrolysis; electrochromism; cyclic voltammetry; scanning electron microscopy and X-ray diffraction
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The electrochromic (EC) behavior of fibrous reticulated WO3 films prepared from ammonium tungstate precursor by pulsed spray pyrolysis method was investigated. All the films were prepared using identical technological parameters and a thorough investigation of the electrochromic properties of the films deposited at 300 degrees C is reported. The structural properties were studied by X-ray diffraction (XRD) and scanning electron microscopy (SEM). The electrochromic and optical properties were measured using cyclic voltammetry and ultraviolet (UV)-visible spectrophotometry. The films are amorphous and have a fibrous reticulate-like morphology having micronsize circular rings. The films show high transparency in the visible range and the optical band gap energy is about 3.1 eV. Electrical measurements show that the resistivity monotonically decreases as temperature increases, which indicates thermal hopping transport. The activation energy for hopping transport is of the order 4 x 10(-4) eV. The electrochromic coloration efficiency (CE) is found to be 34 cm(2)/C at 630 nm. (c) 2007 Elsevier B.V. All rights reserved.
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