Tandem solar cells (TSCs) are devices made of multiple junctions with complementary absorption ranges, which aim to overcome the Shockley–Queisser limit of single-junction solar cells. Currently, metal-halide hybrid perovskite solar...
Solar cells based on metal-halide perovskite semiconductors inspire high hopes for efficient low-cost solar energy conversion technology. We here reflect on recent progress and potential limitations of the band gap tunability of these compound semiconductors.