A perovskite-based solar cell is a solar cell introduced in recent years. One of its obvious weaknesses is its low efficiency, which makes it possible to consider this type of solar cell in multiple (paired) forms with a solar cell of the other type. The CIGS and a-si and c-si solar cells are typical examples paired with perovskite solar cells to increase efficiency. The efficiency of 28% was achieved without the presence of a pair of other types by changing some parameters such as the thickness of the absorbent layer and the right choice of the anti-reflection layer and the back contact layer. To investigate the effect of the anti-reflection layer on the efficiency of Perovskite solar cells, materials such as Al2O3, SiO2 and ZnO with various thicknesses were placed as an anti-reflection layer, with the best efficiency achieved by SiO2 with an optimum value of 100 nm. Graphite connector was also considered as an optimal choice because the inexpensiveness and flexibility of this material compensate for a 2% reduction in efficiency. This study shows that solar cell can be constructed based on the only perovskite, which represents a new generation of cheap and economical solar cells, which are very easy to construct and their raw materials are very accessible. The numerical simulation tool used in this study was the Silvaco software atlas module. The J-V specification is simulated under the standard AM 1.5G lighting.