In Situ Formation of Compact PbI₂ Shell Boosts the Efficiency and Thermostability of Perovskite Solar Cells

Judicious tailoring of a robust interlayer is central to maintain the durable operation of optoelectronic devices. In this paper, an ultrathin, compact, and uniform PbI 2 shell on the surface of perovskite via the method of ZnI 2 aided in situ transformation is produced. The resultant PbI 2 interlayer can prolong the excited‐state lifetime of perovskite and attenuate the recombination kinetics of separated charges, leading to an improvement of...