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Mixed lead‐tin (PbSn) perovskite solar cells (PSCs) possess low toxicity and adjustable bandgap for both single‐junction and all‐perovskite tandem solar cells. However, the performance of mixed PbSn PSCs still lags behind the theoretical efficiency. The uncontrollable crystallization and the resulting structural defect are important reasons. Here, the bidirectional anions gathering strategy (BAG)...
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