The power conversion efficiency (PCE) of metal halide perovskite solar cells (PSCs) has improved dramatically from 3.8% to 25.5% in only a decade. Gas quenching is a desirable method for fabricating high-efficiency cells as it does not consume antisolvents and is compatible with large-area deposition methods such as doctor blading and slot-die coating. To further improve PCEs for gas-quenched PSCs, here, we develop complementary bulk and surface passivation strategies by incorporating potassium iodide (KI) in the perovskite precursor and applying n-hexylammonium bromide (HABr) to the perovskite surface. We show that (1) KI induces a spatial-compositional change, improving grain boundary properties; (2) KI and HABr reduce traps, especially at levels close to the mid-gap; and (3) HABr greatly improves the built-in potential of the device, thereby improving voltage output. The champion device achieves a steady-state PCE of 23.6% with a V_OC of 1.23V, which is, to the best of our knowledge, the highest for PSC by gas quenching to date.

金属卤化物钙钛矿太阳能电池 (PSC) 的功率转换效率 (PCE) 在短短十年内从 3.8% 大幅提高到 25.5%。气淬是制造高效电池的理想方法，因为它不消耗反溶剂，并且与大面积沉积方法兼容，例如刮刀和槽模涂布。为了进一步改善气淬 PSC 的 PCE，我们通过在钙钛矿前驱体中加入碘化钾 (KI) 并将正己基溴化铵 (HABr) 应用到钙钛矿表面，开发了互补的本体和表面钝化策略。我们表明 (1) KI 引起空间成分变化，改善晶界特性；(2) KI 和 HABr 减少陷阱，尤其是在接近中间间隙的水平处；(3) HABr 极大地提高了器件的内置潜力，从而提高电压输出。冠军设备实现了 23.6% 的稳态 PCE，V_OC为 1.23V，据我们所知，这是迄今为止气淬 PSC 的最高值。