Considering the fact of toxicity, researchers are continuously working on Pb-free perovskite solar cells. Many researchers have contributed with different cell structures with non-toxic absorber materials. Several research groups have reported different cell structures with non-toxic absorber material. Glass/ZnO:Al/TiO2/CH3NH3SnI3/CuI/Au structure shows efficiency of 24.82% and FTO/TiO2/FASnI3/Spiro-OMeTAD/Au structure shows 14.03% and FTO/TiO2/CsSnI3/Spiro-OMeTAD structure shows 20.2% . These structures identify the impact of different HTMs. Different HTMs can provide different efficiency. Hence, a study on new HTM for perovskite solar cells is important as the efficiency and stability of the cell are dependent on HTM. In this study, we have introduced a new HTM for non-toxic perovskite solar cells. Here we have chosen V2O5 ETM for tin-based perovskite solar cells. V2O5 is cheaper than other HTMs. Hence, it will be more compatible with perovskite solar cells, if it can provide an optimal efficiency. A comparison of the price of common HTM and V2O5 is given below. The perovskite absorber material used in this study is CsSnI3 while ETM is WS2. This is a unique cell structure that was not explored before. As each new cell structure is important for developing perovskite solar cells commercially. Hence, studying the cell structure is important. Additionally, the optimization of cell parameters is important to extract maximum efficiency. In this study, we have designed a new cell structure with CsSnI3 non-toxic perovskite absorber materials, V2O5