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The effect of the Zn/Sn ratio in the solution on the properties of Cu2ZnSnS4 films prepared by sol-gel method has been investigated. As the Zn/Sn ratio in the solution increases to a certain value, a pure single phase kesterite CZTS is obtained and confirmed by XRD, XPS and Raman. Through controlling the Zn/Sn ratio in the solution, secondary phases such as SnO2 can be avoided and an optimal condition...
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