Here we investigate the role of charge trapping/recombination dynamics at halide interstitials, responsible for halide segregation, when wide-band gap perovskites are embodied in solar cells. Such dynamics can be either fast (picoseconds-nanoseconds) or slow (nanoseconds-μs) according to the oxidation state of the halide defect. When carriers accumulate within the perovskite, at open-circuit conditions, the trapping/recombination process having the slowest dynamics causes photo instability predominantly. When the solar cell is under a load, the device performances are mainly affected by the fast carrier trapping, depending on a direct competition between the trapping rate and the charge extraction efficiency. We show that by selectively passivating the defects correlated to fast carrier trappings, the solar cell operation and stability can be largely improved by improving the charge extraction. Thus, a deep knowledge of the chemical nature of defect activities and the corresponding electronic dynamics is crucial for maximizing the performance and stability of wide bandgap perovskite solar cells.

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俘获载流子动力学在卤化铅宽带隙钙钛矿太阳能电池工作中的作用

在这里，我们研究了当宽带隙钙钛矿应用于太阳能电池时，卤化物间隙中电荷捕获/复合动力学的作用，卤化物间隙负责卤化物偏析。根据卤化物缺陷的氧化态，这种动力学可以快（皮秒-纳秒）也可以慢（纳秒-μs）。当载流子在开路条件下在钙钛矿内积累时，动态最慢的捕获/复合过程主要导致光不稳定。当太阳能电池处于负载状态时，器件性能主要受到快速载流子捕获的影响，取决于捕获率和电荷提取效率之间的直接竞争。我们表明，通过选择性地钝化与快速载流子捕获相关的缺陷，可以通过改善电荷提取来大大提高太阳能电池的运行和稳定性。因此，深入了解缺陷活动的化学性质和相应的电子动力学对于最大化宽带隙钙钛矿太阳能电池的性能和稳定性至关重要。