In this study, we propose an all-perovskite solar cell design that addresses the challenges of cost, efficiency, and toxicity. The proposed approach involves replacing toxic absorber materials with environmentally friendly alternatives and substituting expensive ETM, HTM, and back contact materials with low-cost options. Notably, raw perovskite materials cost between $0.11/g to $1.40/g , making them more affordable than conventional ETMs and HTMs. Additionally, a comparative analysis of back contact materials is presented to further reduce overall costs. Since there are no comprehensive theoretical or experimental reports available on the development of such an all-perovskite solar cell, numerical simulations will be conducted to optimize key parameters for practical implementation.