Light-induced halide segregation is an intrinsic instability of mixed-halide perovskites, which complicates their successful use in tandem solar cells. Methods to suppress this phenomenon remain elusive because of its ambiguous origin. Beal et al. demonstrate that photostability is not an exclusive property of perovskite crystal structure and instead highlight the need for a microscopic understanding of the phenomenon.

中文翻译：

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究竟是什么导致混合卤化物钙钛矿中光诱导的卤化物偏析？

光诱导的卤化物偏析是混合卤化物钙钛矿固有的不稳定性，这使其在串联太阳能电池中的成功使用变得复杂。由于其模棱两可的原因，抑制这种现象的方法仍然难以捉摸。Beal等。证明光稳定性不是钙钛矿晶体结构的专有属性，而是强调了对这种现象的微观理解的需要。