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Thin-film CdSe has been deposited electrochemically from an aqueous solution of selenosulfite. The light-to-electric power conversion efficiency depends on the annealing atmosphere with air (oxygen) giving the highest value. The power conversion efficiency correlates with the donor density, the quantum efficiency, and the minority-carrier diffusion length. Surface analytical techniques have been used to detect the presence of oxygen in the film. Various mechanisms for oxygen activation of the film are considered.
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Szabo et al. (1987) studied this question.
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