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Abstract

A number of experimental photothermal deflection, ac photovoltage, and ac photocurrent spectra for CdS photoelectrochemical cells are presented. The spectra were obtained under various conditions, with the use of modulated light: open circuit and short circuit, and with a dc bias applied across the working and counter electrodes. The measurement of both the photothermal deflection and the photoaction signals allows one to monitor two energy conversion channels, namely optical-to-thermal, and optical-to-electrical. The photothermal deflection technique was found to provide useful information regarding the surface condition of the electrodes, with respect to polishing or corrosion damage. Finally, the effect of a current-induced species gradient at the working electrode/electrolyte interface upon the photothermal deflection signal is also examined.

Keywords

Photothermal deflection spectroscopy Photocurrent/photovoltage spectroscopy CdS photoelectrode Photoelectrochemical energy conversion

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Photothermal Beam Deflection and Photoaction Spectroscopic Study of CdS Photoelectrodes in Polysulfide Electrolyte

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