Reduction effects on the spectral response of ceramic TiO2 photoanodes |
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| Authors: | J.F. Houlihan R.F. Bonaquist R.T. Dirstine D.P. Madacsi |
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| Affiliation: | Department of Physics Shenango Valley Campus Penn. State University Sharon, PA 16146 USA;Unitrode Corporation Watertown, Mass. 02172 USA;Department of Physics University of Conn. at Avery Point Groton, CT 06340 USA |
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| Abstract: | Spectral response measurements on ceramic TiO2 photoanodes prepared in reducing atmospheres over a range of pO2 values from 10?4 to 10?12 atm. are reported. The results are interpreted in terms of the various defect states of reduced TiO2. In addition, a sub-bandgap absorption at 2.2eV is attributed to suboxides of titanium produced at the surface during reduction and subsequent d-state transitions under illumination. |
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