Photoelectrochemical and structural characterization of carbon-doped In2O3 and carbon-doped WO3 films prepared via spray pyrolysis

Yanping Sun; Rina Rajpura; Daniel Raftery

doi:10.1117/12.825376

20 August 2009 Photoelectrochemical and structural characterization of carbon-doped In₂O₃ and carbon-doped WO₃ films prepared via spray pyrolysis

Yanping Sun, Rina Rajpura, Daniel Raftery

Author Affiliations +

Proceedings Volume 7408, Solar Hydrogen and Nanotechnology IV; 74080D (2009) https://doi.org/10.1117/12.825376
Event: SPIE Solar Energy + Technology, 2009, San Diego, California, United States

Abstract

Carbon-doped In₂O₃ and carbon-doped WO₃ films were produced using a spray pyrolysis methodology with octanoic acid as the carbon dopant source. C-doped and undoped In₂O₃ films showed a cubic polycrystalline In₂O₃ structure, and C-doped and undoped WO₃ films displayed a monoclinic polycrystalline WO₃ structure. C-doped In₂O₃ and WO₃, compared to their corresponding undoped materials, showed increased absorption in the 350-550 nm range with a red shift in the band gap transition. The presence of carbonate-type species in these C-doped samples was confirmed by XPS. The photoelectrochemical activity was evaluated under near UV-visible light and visible light only irradiation conditions. Under the same irradiation conditions, C-doped In₂O₃ and C-doped WO₃ electrodes produced greater photocurrent densities than their corresponding undoped electrodes. The C-doped In₂O₃ electrode exhibited photocurrent densities up to 1 mA/cm², with 40% from visible light irradiation, and the C-doped WO₃ electrode showed photocurrent densities up to 1.3 mA/cm², with 50% from visible light irradiation. These results indicate the potential for further development of In₂O₃ and WO₃ photocatalysts by simple wet chemical methods, and provide useful information towards understanding the structure and enhanced photoelectrochemical properties of these materials.

Citation Download Citation

Yanping Sun, Rina Rajpura, and Daniel Raftery "Photoelectrochemical and structural characterization of carbon-doped In₂O₃ and carbon-doped WO₃ films prepared via spray pyrolysis", Proc. SPIE 7408, Solar Hydrogen and Nanotechnology IV, 74080D (20 August 2009); https://doi.org/10.1117/12.825376

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