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In this study, the crystalline quality of CsPbBr3 is significantly improved through a two-pronged strategy using a two-step process. Specifically, we combined the etching effect of PEG on PbBr2 with the strong permeation effect of CsBr aqueous solution in the CsPbBr3 preparation. Under 1-sun illumination, the PCE of printable mesoscopic perovskite solar cells (p-MPSCs) based on CsPbBr3 reached an impressive 10.04%, marking the highest reported value to date. By capitalizing on the excellent thermal stability of CsPbBr3 and fully harnessing the surface thermal energy of the device using a thermal-to-electricity generator (TEG) module, the assembled p-MPSC-TEG series-connected four-terminal tandem device achieves a power output of up to 28.35 mW cm−2 under concentrated light. This groundbreaking research not only establishes a new benchmark for all-inorganic p-MPSCs but also underscores their potential for high power output, stability, and simultaneous solar energy utilization in photothermal applications.
Shao et al. (Mon,) studied this question.