| Summary: | Alternative photo-sintering techniques for thermal annealing processes are used to improve the morphology, layer properties, and enhance solar cell performance. The fast, nontoxic, low cost, and environmentally friendly characteristics of Cu<sub>2</sub>ZnSnS<sub>4</sub> have led to its consideration as an alternative potential absorber layer in copper indium gallium diselenide thin film solar cells. This work investigates the photo-sintering process for the absorber layer of Cu<sub>2</sub>ZnSnS<sub>4</sub> solar cells. A Cu<sub>2</sub>ZnSnS<sub>4</sub> layer was grown by hot-injection and screen-printing techniques, and the characteristics of the photo-sintered Cu<sub>2</sub>ZnSnS<sub>4</sub> layer were evaluated by X-ray Diffraction, Raman spectroscopy, Energy dispersive X-ray analysis, Ultraviolet-visible spectroscopy, and field emission scanning electron microscopes. Overall, the optimal composition was Cu-poor and Zn-rich, without a secondary phase, estimated optical band-gap energy of approximately 1.6 eV, and enhanced morphology and kesterite crystallization. Using an intensity pulse light technique to the CZTS layer, fabrication of the solar cell device demonstrated successfully, and the efficiency of 1.01% was achieved at 2.96 J/cm<sup>2</sup>.
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