Perovskite/CIGS tandem solar cells - can they catch up with perovskite/c-Si tandems?

We show a monolithic perovskite/CIGS tandem solar cell with a certified PCE of 24.2% and a high V
_OC
of 1.77 V, enabled by reduction of interface recombination. Using optical simulations, we further optimize the structure of the cell and compare it to perovskite/silicon tandem solar cells. The yearly energy yield of the perovskite/CIGS tandem is only 6% lower than that of the perovskite/silicon tandem, showing great potential of the perovskite/CIGS technology.