Quantifying Efficiency Limitations in All-Inorganic Halide Perovskite Solar Cells
All-inorganic perovskites, which replace the organic A-site cation with inorganic elements, are promising candidates for photovoltaics due to their improved stability relative to hybrid perovskites. Here Yuan et al. review the state-of-the-art of all-inorganic perovskites for photovoltaic applications by performing detailed meta-analyses of key performance parameters on the cell and material level.
While halide perovskites have excellent optoelectronic properties, their poor stability is a major obstacle towards commercialization. There is a strong interest to move away from organic A-site cations such as methylammonium and formamidinium towards Cs with the aim of improving thermal stability of the perovskite layers. While the optoelectronic properties and the device performance of Cs-based all-inorganic lead-halide perovskites are very good, they are still trailing behind those of perovskites that use organic cations. Here, Yuan et al. review the state-of-the-art of all-inorganic perovskites for photovoltaic applications by performing detailed meta-analyses of key performance parameters on the cell and material level. The key material properties such as carrier mobilities, external photoluminescence quantum efficiency and photoluminescence lifetime are discussed. Additionally, they adopt a unified approach for analyzing performance losses in perovskite solar cells based on breaking down the losses into several figures of merit representing recombination losses, resistive losses and optical losses. Based on this detailed loss analysis, we eventually develop guidelines for future performance improvement of all-inorganic perovskite solar cells.
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