Though the cesium-based inorganic perovskite solar cells (IPSCs) have developed rapidly in recent two years, the power conversion efficiency (PCE) is still far away from the Shockley-Queisser limit due to the large open-circuit voltage (V-oc) deficit, which results from the large energy loss (E-loss). Large E-loss has been a major obstacle for further efficiency improvement of IPSCs. In this review, the authors, for the first time, focus on investigating the E-loss of IPSCs and start from discussing the essence and origin of the E-loss. Then, the reported efficient methods for reducing the band tails and energy disorder are systematically summarized and reviewed, including crystallization optimization, defect passivation, and interface engineering. Finally, the authors offer an overall perspective on managing E-loss in IPSCs and point out the possible ways to reduce the E-loss and promote the efficiency. This review provides a basic understanding of E-loss and may inspire new designs or more impactful methods for further minimizing the E-loss of IPSCs.
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