Influence of point defects on the performance of InVO4 photoanodes

Roel Van de Krol; Julie Ségalini; Cristina S. Enache

doi:10.1117/12.860463

24 August 2010 Influence of point defects on the performance of InVO₄ photoanodes

Roel Van de Krol, Julie Ségalini, Cristina S. Enache

Proceedings Volume 7770, Solar Hydrogen and Nanotechnology V; 77700S (2010) https://doi.org/10.1117/12.860463
Event: SPIE Solar Energy + Technology, 2010, San Diego, California, United States

Abstract

The properties of thin film InVO4 photoanodes for water splitting have been studied. Compact films of InVO4 were prepared by spray pyrolysis and are found to be stable between pH 3 - 11. Although the indirect bandgap is 3.2 eV, a modest amount of visible light absorption is observed. The origin of this absorption is attributed to the presence of deep donor states at ~0.7 eV below the conduction band. Shallow donors are absent in this material, in contrast to what is normally observed for metal oxides. The deep donor model explains the much stronger visible light absorption of powders compared to thin films, and is supported by photoluminescence data. The origin of the deep donors is attributed to deviations in the In:V ratio, and the corresponding defect-chemical reactions will be discussed.

Citation Download Citation

Roel Van de Krol, Julie Ségalini, and Cristina S. Enache "Influence of point defects on the performance of InVO₄ photoanodes", Proc. SPIE 7770, Solar Hydrogen and Nanotechnology V, 77700S (24 August 2010); https://doi.org/10.1117/12.860463

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