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Thin Solid Films
Year: 2010  |  Volume: 518  |  Issue: 15  |  Page No.: 4197 - 4202

Influence of electrodeposition potential and heat treatment on structural properties of CdTe films

Shu-Ying Yang, Jung-Chuan Chou and Herng-Yih Ueng    

Abstract: A modified Butler-Volmer model is developed to predict the potential of perfect stoichiometry (PPS) for electrodeposition. CdTe thin films are deposited in an acidic solution; their electrodeposition mechanism is investigated using cyclic voltammetry. Calculated and experimental PPS values exhibit good agreement. At PPS, well-connected granular CdTe thin films can be deposited; these are predicted to be intrinsic, and slightly p-type due to cadmium vacancies. Type conversion occurs only because of defect redistribution and local defect reactions after annealing; the converted n-type layer exhibits lower resistivity and higher mobility. A film annealed at 350 °C exhibits excellent crystallization.

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