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ArticleFully Air-Processed Dynamic Hot-Air-Assisted M:CsPbI2Br (M: Eu2+, In3+) for Stable Inorganic Perovskite Solar Cells
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Organic-inorganic mixed-halide perovskite solar cells are promising photovoltaic technology and are now passing 25.5% power conversion efficiency (PCE). However, due to the poor thermal stability of conventional organic cations, the all-inorganic halide perovskites have attracted great interest. Here we developed a dynamic hot-air method for the deposition of highly uniform M:CsPbI2Br perovskite thin films that are highly stable under ambient conditions. We adopted a Eu2+ and In3+ divalent and trivalent metal-ion-incorporation protocol for making thermodynamically stable photoactive black-phase CsPbI2Br. The partial pre-evaporation of DMSO solvents leads to the formation of a PbX2-DMDO-CsI intermediate phase that results in a highly uniform >530 nm thick perovskite M:CsPbI2Br absorber. A champion device with an InCl3:CsPbI2Br-based absorber exhibited a PCE of 17.45% with record open-circuit voltage of 1.334 V and fill factor of 80.1% and retains >200 h thermal stability.
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