One of the weakest points in organic–inorganic hybrid perovskites is their instability against light, which has puzzled the research and industry communities despite a lot of efforts conducted so far. Although how perovskites break down under light illumination has been much investigated and verified, where chemical degradation occurs in the presence of oxygen and moisture, the fundamental cause for light instability in inert conditions remains unclear. A big question with respect to device lifetime is whether a perfect encapsulation method (ideally, no penetration of moisture and oxygen) will lead to long-term stability during an actual energy-harvesting operation. If not, the fundamental cause for light-induced instability needs to be thoroughly investigated and prevented technically during device operation for their commercialization. In this Perspective, we propose the trapped charges as a fundamental cause of both intrinsic and extrinsic degradation induced by light soaking and even the ion migration observed during the degradation process based on experiments and theoretical calculations as well as revisiting previous studies on degradation. Additionally, practical techniques to suppress charge trapping in a device will be discussed for the community.

中文翻译：

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俘获电荷：钙钛矿中光诱导不稳定性的根本原因


有机-无机杂化钙钛矿最薄弱的一点是它们对光的不稳定性，尽管迄今为止进行了大量努力，但这仍困扰着研究和工业界。尽管钙钛矿在光照下如何分解已经得到大量研究和验证，其中化学降解发生在氧气和水分的存在下，但在惰性条件下光不稳定的根本原因仍不清楚。关于设备寿命的一个大问题是，完美的封装方法（理想情况下，没有水分和氧气的渗透）是否会在实际的能量收集操作中实现长期稳定性。如果不是，则需要在器件运行期间彻底调查和预防光诱导不稳定的根本原因，以实现其商业化。在这个观点中，我们提出俘获电荷是光浸泡诱导的本征和外源性降解的根本原因，甚至基于实验和理论计算，以及重新审视以前的降解研究。此外，还将为社区讨论抑制器件中电荷捕获的实用技术。