Abstract
In this letter, a simple and low cost route is proposed to fabricate Cu2MSnS4 (M: Cd, Mn) thin films. As a comparison, Cu2MSnS4 (M: Zn) is also listed. The precursor films of Cu2MSnS4 (M: Zn, Cd, Mn), stacked as SnS, Cu, and ZnS(CdS or MnS), are deposited by the CBD method, along with a subsequent sulfurization heat treatment. All films show good morphology, analogous crystal structure, strong optical absorption characteristics and proper values of band gaps (CZTS-1.41eV, CCTS-1.07eV and CMTS-1.45eV) for thin film solar cells, which suggest that the high quality Cu2MSnS4 (M: Zn, Cd, Mn) thin films can be easily obtained by this CBD-annealing route. If the present technique was properly extended, it would be also possible for the low cost and large-scale preparation of other multi-elements thin films with stacked layers for practical application.
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