Publication date: 4th October 2024
Vacancy defects in perovskites are a significant problem that leads to the degradation of perovskite solar cells (PSCs). Strategies of introducing excessive ionic iodide has been employed to compensate for these vacancies. However, these excessive ionic iodides cannot effectively reduce defects during the perovskite crystallization process, as their similar chemical properties as the original ionic iodide in the precursor solution. Moreover, these iodide ions present in the perovskite films can act as interstitial defects, which are detrimental to the stability of the perovskite. We find that vacancy defects can be effectively suppressed by inclusion of α-iodo ketone during the perovskite crystallization. This suppression is achieved by a rapid collective transformation of lead polyhalides through halides ions release of Kornblum oxidation reaction. More importantly, excessive iodides within formed perovskite film can be removed by a subsequent elimination reaction. Based on this strategy, the PSC achieves significantly improved thermal stability, which maintain 82% of initial PCE for 2800 h at 85 °C.
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