The energy conversion efficiency and limits of perovskite/silicon solar cells are investigated. The influence of a layered approach in preventing lead leakage in perovskite solar cells is discussed. The highest efficiency perovskite tandem to date was achieved by pairing a perovskite top cell with a Si bottom cell in a four-terminal configuration, yielding 26.4%. Perovskite cell integrated with crystalline silicon cell to form a tandem solar device has shown high performance above the single pn-junction silicon devices. Although sufficient work and different strategies have been applied to increase efficiency in these devices, the tandem application has achieved efficiency of 29% in a short period.