Photostimulated transformations in nanosized MoO3 films

Irradiation of MoO3 films (with a thickness d = 5–54 nm) with light (λ = 320 nm, I = (1.5–7) × 1015 quantum cm−2 s−1) led to the formation of an absorption band at λ = 870 nm along with the shift of the edge of the absorption band to the short-wave region of the spectrum. Further irradiation of the samples with light at λ = 870 nm caused diffusion of the long-wave absorption band. The conversion of MoO3 films increased when the incident light intensity and irradiation time increased and the film thickness decreased under the atmospheric conditions. A mechanism of the photochemical transformation of MoO3 films was suggested. It involves the generation of electron-hole pairs, recombination of some nonequilibrium charge carriers, formation of [(e(V a )++ e] centers, and isolation of photolysis products.

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