CdS/CdTe solar cells are recognized as one of the most promising and efficient solar cells in second-generation PV technology. Owing to their simplicity of fabrication and cost-effectiveness, researchers are focusing on improving the conversion efficiency to make it a front-line solution for the energy crisis. In the path to improvise efficiency, the fill factor plays a vital role. Still, it is pretty challenging to determine the factors that influence the fill factor and improve it in line with the improvisation of efficiency since, most of the time, they are not improved in tandem. This paper summarises the improvisation of the fill factor of CdS/CdTe solar cells developed elsewhere by different deposition techniques and treatments from the mid-1960s.