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Introducing excess PbI2 has proven to be an effective in situ passivation strategy for enhancing efficiency of perovskite solar cells (PSCs). Nevertheless, the photoinstability and hysteresis are still tough issues owing to the photolysis nature of PbI2. Moreover, the humidity‐related degradation of perovskite films is also a difficult territory to cover in such an in situ passivation strategy. Herein,...
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