Crystalline silicon (c-Si) solar cells account for more than 90% of the total solar cell market, and 90% of silicon solar cells are standard structure (Al BSF) solar cells based on p-type wafers. Standard structure Solar cell is accepted as a limit of efficiency by 20% due to limitation of cell structure. High efficiency cells such as PERX (PERC, PERT, PERL), Interdigitated Back Contact (IBC) and HIT (Heterojunction with Intrinsic Thin layer) have been developed and commercialized to overcome the limitations of these standard structure solar cells. To improve the efficiency of solar cells, there is one strategy to improve the efficiency of the device. By joining the perovskite solar cell and the low-cost silicon solar cell, the high efficency over 30% can be achieved.
Here, we present a new design for a monolithic perovskite/silicon-homojunction tandems solar cell. This work opens up new possibilites in a silicon / perovskite tandem solar cell technology to improve the cell efficiency of a standard structure solar cell to a high efficiency cell level without replacing the standard structure solar cell production infrastructure. For monolithic tandem solar cell fabricating the perovskite on top of the silicon bottom cell, the current matching and tunneling junction are crucial points. By the current matching and optimization of the tunneling junction, we fabricated high efficiency monolithic tandem solar cells.