Abstract
The acquisition of new materials for the manufacturing of high efficiency and low-cost photovoltaic devices has currentlybecome a challenge. Thin films of CuInGaSe and CdTe have been widely used in solar cell of second generation, achieving efficiencies about 20 %; however, the low abundance of In and Te as well as the toxicity of Cd are the primary obstacles to their industrial production. Compounds such as Cu 2 ZnSnS 4 , Cu 2 ZnSnSe 4 and Cu 2 ZnSn(SSe) 4 have emerged as an important and less costly alternative for efficient energy conversion in the future. In addition, these compounds have the required characteristics to be used as an absorber material in solar cells (band-gap close to 1.4 eV, an absorption coefficient greater than 10 4 cm -1 and a p-type conductivity). In this work, we present a study of the structural, compositional, morphological and optical properties of Cu 2 ZnSnS 4 thin films deposited by spray pyrolysis technique as well as their dependence on temperature.
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