OPTICAL AND PHOTOLUMINESCENT STUDIES ON VO DOPED SnO2 THIN FILMS

摘要

VO2+ doped SnO2 thin films have been prepared on ultra-clean glass substrates by chemical spray pyrolysis technique. UV-vis, PL, Electrical conductivity and chromaticity studies were investigated on VO2+ doped SnO2 thin films. Optical absorption spectrum showed three bands at 753, 720 and 610 nm in the wavelength range 300-800 nm. DC electrical conductivity studies revealed that large value of thermoelectric power of VO2+ doped SnO2thin films possess semiconductor behaviour. The thermo emf of VO2+ doped SnO2thin films was studied in the temperature range 275 - 325 K using thermal probe method. Photoluminescence spectrum showed that the optical bands lie at 352 and 436 nm. The CIE (x, y)chromaticity is calculated from the emission spectrum and the coordinates were found for VO2+ doped SnO2 thin films at (x = 0.2993, y = 0.4912) showed in blue and yellow regions.