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As univalent cation to the ammonium ions, alkali metal ions become vital alternatives or additives for the A‐site ions of lead halide perovskites. They were reported to construct new perovskite structures or bring new features like reduced defect density, suppressed hysteresis, improved power conversion efficiencies (PCEs), stability, etc. In this work, by making an alloyed film of PbI2:KI in the...
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