In recent decades, there has been an increase in the demand for energy due to the fast economic and population growth which has led to a high reliance on non-renewable energy sources and has adverse environmental impact. Because of its limitless supplies and lack of environmental harming pollutants, solar energy has become a viable alternative for renewable energy. This work intends to propose the advancement of new technique of spin coated pure Cu2ZnSnS4 solar cell by taking into account the CZTS kesterite structure, secondary phases, bandgap and absorbance properties. In order to produce the high-performance solution-processed CZTS solar cells, this work required to take into account the atomic ratio of Cu-poor, Zn-rich, and the film consistency during the spin coating process. The impact of the deposition processes on the variation of the CZTS films' structural, optical, optoelectrical, and electrical properties has been studied. According to the XRD patterns, CZTS thin films are polycrystalline and have a kesterite crystal structure. The evaluated films showed a direct energy gap transition that found to be 1.48 eV. A prominent increase in the nonlinear parameters has been noticed with the increase in the deposition time. This study can assist in determining the possibility of using CZTS in nonlinear devices. As the film thickness has increased, the activation energy values were reduced which confirming an improvement in film uniformity. The improved CZTS's lowest dielectric loss, which has attained with less inherent defects, proved the materials' viability. Therefore, the paper provides a simple and suitable approach for fabricating CZTS without post-treatment to make low-cost solar cells