Highly efficient prismatic perovskite solar cells

Prismatic perovskite solar cells (Prim PVSC) were designed to mitigate thermodynamic losses of traditional single unit cells. By guiding the flow of light, the solar photons with high-to-low energy could be captured separately by the four subcells with varied, yet matched, bandgaps of MAPbI x Br 3−x films. This is the first Prim PVSC with four series subcells that generates a record V oc of 5.3 V and a high PCE of 21.3%, providing a new method for breaking the PCE bottleneck of PVSCs.