期刊
JOURNAL OF PHYSICAL CHEMISTRY C
卷 111, 期 49, 页码 18251-18257出版社
AMER CHEMICAL SOC
DOI: 10.1021/jp075835b
关键词
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Mixed molybdenum-tungsten oxides of varying stoichiometry (MoxW1-O-x(3), 0 < x < 1) prepared by cathodic electrodeposition from aqueous peroxo-polymolybdotungstate solutions on indium tin oxide (ITO) coated glass substrates were evaluated by variable-angle spectroscopic ellipsometry (VASE) and transmission measurements from 200 to 1000 nm (1.24-6.2 eV). A Tauc-Lorentz dispersion model was used to determine the real and imaginary components of the complex refractive index for MoxW1-O-x(3) films as a function of Mo fraction. The optical band gaps were also estimated from Tauc plots. The refractive index increased (2.07-2.20 at 800 nm) while the optical band gap decreased (3.38-2.95 eV) in a linear fashion for MoxW1-O-x(3) films with increasing Mo fraction. These trends correlate chiefly with Mo-doping-induced changes in film structure and grain size as supported by X-ray diffraction measurements.
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