Abstract
The spectral dependences of the absorption coefficient and steady-state photoconductivity and the relaxation of photoconductivity (after illumination switch off) in nanocrystalline indium oxide (In2O3) films synthesized by the sol–gel method are investigated. The mean nanocrystal size varies from 7–8 to 39–41 nm, depending on the sample-preparation conditions. The optical band gap of nanocrystalline In2O3 is determined as a result of combined analysis of the optical absorption spectra and the spectral dependence of the photoconductivity. The optical band gap in nanocrystalline In2O3 is found to be much narrower than the optical band gap in In2O3 single crystals. The photoconductivity decay kinetics in nanocrystalline In2O3 in air, vacuum, and argon at room temperature are studied. A model explaining the observed photoconductivity decay is proposed.
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