Electric power generated by cadmium telluride (CdTe) polycrystalline thin-film solar cells may potentially be cost-competitive with power from conventional sources such as oil, natural gas, coal, and nuclear. The polycrystalline CdTe solar cell technology has recently achieved reported efficiencies of over 10% in several laboratories, and large-area cells can be deposited by several potentially low-cost methods. This paper describes cadmium telluride material properties, electronic properties (especially doping and contacting), CdTe alloys and their potential usefulness, solar cell structures in which CdTe can be an important component, and the status of several efforts to optimize the performance of polycrystalline CdTe solar cells deposited by potentially low-cost technologies.
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