The rapid success achieved from perovskite solar cell has drawn great expectations for commercialization of next-generation photovoltaics. Among the various perovskite materials, the inorganic perovskite derivatives have been of particular interest, ascribed to its superior thermal and chemical stability, which is a crucial criterion for reliable long-term operation. Nonetheless, the development of the efficient inorganic perovskite solar cells has been lagged from its organic–inorganic hybrid counterparts owing to the notorious phase-stability challenges associated with the formation of non-photoactive phases. The early progress of the inorganic perovskite solar cells has been centered on the stable perovskite phase-preparation and leads to the effective bulk management through intermediate engineering and compositional engineering strategies. Yet, challenges remain in securing the as-formed perovskite phase throughout the long-term operation. Accordingly, recent studies find interfacial modification strategies successful by constricting the phase-transformation channels in various perspectives such as defect propagation, strain, component segregation, charge accumulation, and external stresses. In this review, we start with the brief description on the inorganic perovskite solar cells and the associated advantages including chemical and optoelectronic properties. We then provide a review on the challenges of inorganic perovskite solar cells associated with the phase instabilities. We elaborate on the origins of the phase instabilities in terms of thermodynamics and the recently proposed channels including intrinsic factors and extrinsic factors that facilitate the detrimental phase transformation. Finally, we survey the recent successful approaches to stabilize the inorganic perovskite solar cells through interface managements and provide outlook on further progress.

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确保无机钙钛矿太阳能电池相稳定性的界面改性策略


钙钛矿太阳能电池的快速成功引发了人们对下一代光伏发电商业化的巨大期望。在各种钙钛矿材料中，无机钙钛矿衍生物特别受关注，因为它具有优异的热稳定性和化学稳定性，这是长期可靠运行的关键标准。尽管如此，由于与非光活性相的形成相关的臭名昭著的相稳定性挑战，高效无机钙钛矿太阳能电池的发展一直落后于有机-无机杂化太阳能电池。无机钙钛矿太阳能电池的早期进展集中在稳定的钙钛矿相制备上，并通过中间工程和成分工程策略实现有效的批量管理。然而，在整个长期运行过程中确保钙钛矿相的形成仍然存在挑战。因此，最近的研究发现，界面改性策略通过在缺陷传播、应变、成分偏析、电荷积累和外部应力等各个方面限制相变通道而取得成功。在这篇综述中，我们首先简要描述无机钙钛矿太阳能电池及其相关优势，包括化学和光电性能。然后，我们回顾了无机钙钛矿太阳能电池与相不稳定性相关的挑战。我们从热力学角度详细阐述了相不稳定性的起源，以及最近提出的通道，包括促进有害相变的内在因素和外在因素。 最后，我们调查了最近通过界面管理稳定无机钙钛矿太阳能电池的成功方法，并提供了进一步进展的展望。