Abstract
Kesterites, Cu2ZnSn(S,Se)4 (CZTSSe) and Cu2ZnSnS4 (CZTS), have been considered as highly prospective candidates for solar cell applications. The non-toxic and earth-abundant elements along with tunable bandgap of CZTSSe indicate a high potential to replace the reported high efficient Cu(In,Ga)(S,Se)2 and CIGS/CIGSSe devices in order to meet the increasing demand of solar cell market. In this review, the structural, optical and electrical properties of CZTS/CZTSSe were analyzed based on recent research in this field. Various vacuum/non-vacuum CZTS/CZTSSe synthesis and fabrication routines were also analyzed. The vacuum based deposition methods have yielded an efficiency of 11.6 % solar cells, while the non-vacuum paths, especially the ink-based approach offered a more convenient synthesis and fabrication choice with an advanced efficiency of 12.6 %. Analysis indicated that the barriers to application of this material system is still remained in both material synthesis and device fabrication. Further elucidation on possible mechanism of solution-based synthesis and some of the key barriers of improving the device efficiency are required to being pushed forward.
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