High-efficiency perovskite solar cells (PSCs) normally rely on costly, high purity (>99.99%), air-sensitive raw materials that vary batch-to-batch. The perovskite films and devices derived from conventional raw materials mixture method suffer from inferior reproducibility of optoelectronic properties and performance, as well as discounted promise towards low-cost scalable manufacturing. Distinguished from the direct mixing of raw materials, the preparation of perovskite films with precursors made by the redissolution of perovskite crystals holds the promise to make PSCs more affordable, reproducible, efficient and stable. The resultant perovskite films inherit the exceptional characteristics of the parent perovskite crystals, such as high crystallinity, high purity, accurate stoichiometric ratio, and low trap-state density, as well as good ambient and phase stability. Herein, we summarize recent progress on the employment of the perovskite crystals redissolution strategy for achieving low-cost, efficient perovskite-based solar-to-electricity conversion, which will help both popularize the redissolution strategy and reveal unprecedented advantages gained by its adoption.

高效钙钛矿太阳能电池 (PSC) 通常依赖于成本高、纯度高 (>99.99%) 的空气敏感原材料，这些原材料的批次不同。源自传统原材料混合方法的钙钛矿薄膜和器件的光电特性和性能的再现性较差，并且对低成本可扩展制造的承诺打折扣。与原材料的直接混合不同，通过钙钛矿晶体的再溶解制备钙钛矿薄膜的前体有望使 PSC 更实惠、可重复、高效和稳定。由此产生的钙钛矿薄膜继承了母体钙钛矿晶体的特殊特性，如高结晶度、高纯度、精确的化学计量比和低陷阱态密度，以及良好的环境和相位稳定性。在此，我们总结了钙钛矿晶体再溶解策略在实现低成本、高效的基于钙钛矿的太阳能到电力转换方面的最新进展，这将有助于普及再溶解策略并揭示其采用所获得的前所未有的优势。