Inorganic perovskite solar cells (PSCs) with inverted (p-i-n) configuration are important for the development of tandem solar cells. Nevertheless, inverted all-inorganic PSCs still remain challenging due to the high-density defects in the perovskite and inorganic charge-transporting layer. Herein, we demonstrate a double-side healing strategy to simultaneously improve the performance of perovskite and electron transporting layer (ETL). Specifically, bipyrimidine hydroiodide (BP-HI) is introduced at the CsPbI₂Br/ZnO interface in inverted PSC. A combined microscopic, mass spectrometric and spectroscopic study reveals that the BP-HI could diffuse into not only perovskite grain boundaries (GBs) but also the ZnO layer. This double-side healing leads to improved conduction through perovskite grain, suppressed ion-migration along perovskite GBs, enhanced built-in electric field cross perovskite film and better electric contact at the PVK/ZnO interface. As a result, the optimized PSCs deliver a champion PCE of 15.36% along with a stabilized power output (SPO) of 15.05%. Meanwhile, these PSCs also display excellent long-term operational stability under ambient conditions. This work thus provides a feasible route for improving the performance and stability of inverted PSCs.

具有倒置（pin）结构的无机钙钛矿太阳能电池（PSC）对于串联太阳能电池的发展非常重要。尽管如此，由于钙钛矿和无机电荷传输层中的高密度缺陷，倒置的全无机 PSC 仍然具有挑战性。在这里，我们展示了一种双面愈合策略，以同时提高钙钛矿和电子传输层 (ETL) 的性能。具体来说，将双嘧啶氢碘化物 (BP-HI) 引入 CsPbI ₂倒置 PSC 中的 Br/ZnO 界面。结合显微镜、质谱和光谱研究表明，BP-HI 不仅可以扩散到钙钛矿晶界 (GB) 中，还可以扩散到 ZnO 层中。这种双面愈合导致通过钙钛矿晶粒的传导改善，沿钙钛矿GB的离子迁移受到抑制，增强的内置电场交叉钙钛矿薄膜以及在PVK/ZnO界面处更好的电接触。因此，优化后的 PSC 提供了 15.36% 的冠军 PCE，以及​​ 15.05% 的稳定功率输出 (SPO)。同时，这些 PSC 在环境条件下也表现出出色的长期运行稳定性。因此，这项工作为提高倒置 PSC 的性能和稳定性提供了一条可行的途径。