Nature of photochromism in amorphous V2O5 thin films

Alexander Gavrilyuk

doi:10.1117/12.266834

6 February 1997 Nature of photochromism in amorphous V₂O₅ thin films

Alexander Gavrilyuk

Proceedings Volume 2968, Optical Organic and Semiconductor Inorganic Materials; (1997) https://doi.org/10.1117/12.266834
Event: International Conference on Advanced Optical Materials and Devices, 1996, Riga, Latvia

Abstract

Photochromism in V₂O₅ evaporated thin films has been investigated, especially with regard to its enhancement by adsorption of dimethylformamide (DMFA) molecules on the oxide surface. Measurements of the film optical properties in a wide energy range have been carried out giving a possibility to propose a model of the mechanism of the photochromic effect in the V₂O₅ films. At first, hydrogen atoms are detached from the adsorbed molecules of DMFA under light irradiation. They are predominantly localized near terminal oxygen atoms forming hydrogen bonds between hydrogen atoms and unshared electron pairs of the terminal oxygen atoms. Afterwards, under the action of light, some of these hydrogen atoms react chemically with oxygen atoms giving rise to the formation of oxygen vacancies. The 'blue' shift of the fundamental absorption edge is caused by two factors: (1) localization of hydrogen atoms near terminal oxygen atoms and (2) formation of oxygen vacancies due to breaking of V equals O bonds.

Citation Download Citation

Alexander Gavrilyuk "Nature of photochromism in amorphous V₂O₅ thin films", Proc. SPIE 2968, Optical Organic and Semiconductor Inorganic Materials, (6 February 1997); https://doi.org/10.1117/12.266834

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