Cathodic Codeposition of Cadmium Telluride on Conducting Glass

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Abstract
Films of cadmium telluride up to 5 μm thick were electrodeposited on glass plates covered with a conductive tin oxide layer sensitized by forming a thin layer of tin through cathodic prereduction. Castaing's probe analysis indicates that the stoichiometric ratio Cd/Te is close to unity in a very narrow potential deposition range. Just after preparation, the films are of the n‐type and preferentially oriented along the [111] axis. After thermal treatment, the films present no cracks, and their doping level is slightly higher. The quantum efficiency was determined by anodic photo‐oxidation. That of the thermally treated films is about 80% that of crystalline cadmium telluride. It is shown that the tin layer instantaneously reacts upon the dissolved Te(IV) in the deposition electrolyte, and it is therefore proposed that tin telluride favors the transit of the charges toward the solution through the conduction band of cadmium telluride, giving more reductive electrons at the formation interface.

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