Materials for thin film solar cells are currently the subject of multiple researches in order to reach the highest ratio efficiency/cost. Tin sulfide (SnS) is one of the most promising solar cell absorber materials because it has appropriate optoelectronics properties and cost-effective. Zinc sulfide are the most common material for buffer layer of a heterojunction solar cell. In this work, we study the electrical characteristics of CIGS based solar cells (Current density Jsc short circuit, open circuit voltage VCO, P(V), and C(V)). The one-dimensional SCAPS-1D is used to analyze numerically the performances of CIGS based solar cells.