Today, the need for primary and secondary energies is always increasing to meet the energy needs of mankind. In recent years, solar cells have been used as an alternative to produce renewable, sustainable, and pollution-free energy. Various materials have been used as the transfer layer in cells. TIO2 is one of these materials that has been widely used as the electron transfer layer, but currently, ZnO is another significant material. is more recently used than TIO2. Also, perovskite solar cells are (...) the new generation of solar cells that belong to the nano family. Currently, perovskite solar cells (PSC) as a promising cell in the electronics industry, due to the high-power conversion efficiency, as well as the relatively lower cost of manufacturing a silicon solar cell, and such high flexibility that leads to the use of Perovskite is on different types of substrates. Also, the use of graphene as the most important fundamental photovoltaic material for photovoltaic energy conversion has emerged and been used. Graphene is used as a transparent electrode, as an active layer between layers, as an electron and hole transfer layer, or as an electron and hole separator layer in the construction of solar cells. In this article, the goal is to find the best structure with the highest power conversion efficiency in solar cells, and we will see further that by using perovskite, ZnO, and graphene, we will achieve a power conversion efficiency of 16% with a low manufacturing cost. (shrink)