Benefit from Photon Recycling at the Maximum-Power Point of State-of-the-Art Perovskite Solar Cells

Self-absorption of internally radiated photons (``photon recycling'') is common in high-quality, direct-gap semiconductors, and can yield increased photovoltage in solar cells and enhanced emission efficiency in LEDs. For perovskite semiconductors, photon recycling is relatively unexplored, especially for devices under operating conditions. The authors develop a model to quantify the extent of photon recycling in state-of-the-art perovskite solar cells of varying nonradiative loss and geometry. They present clear experimental targets for material optoelectronic quality to harness photon recycling in solar cells, with major implications for achieving low-threshold lasing and efficient LEDs.