| dc.description.abstract |
SnO2 nanocrystalline thin films were deposited on glass substrates by the
spray pyrolysis technique in air atmosphere at 375, 400, 425, 450 and
500 ◦C substrate temperatures. The obtained films were characterized by
using XRD. The room temperature photoluminescence (PL) spectra of these
films have near band edge (NBE) and deep level emission under the
excitation of 325 nm radiation. NBE PL peak intensity decreased
consistently with temperatures for samples prepared at 400, 450 and 500 ◦C,
while a sudden reduction in intensity is observed for the sample prepared at
425 ◦C. A similar effect was observed for the optical transmittance spectra.
These effects can be explained on the basis of the change in population of
oxygen vacancies as indicated by the change in a values |
en_US |