Hybrid halide perovskite solar cells have found potential applications beyond terrestrial implementation due to their unique advantages in cold environments. Unfortunately, the pioneer exploits are limited in inferior device efficiency, while the operating mechanisms at low temperatures remain unclear. Here, we revealed substantial performance enhancement for (FA,MA,Cs)Pb(I,Br)₃-based perovskite solar cells at temperatures from 290 to 180 K. Remarkably, the device obtained the highest efficiency of 25.2% (stabilized 24.2%) at 220 K, boosted from a certified efficiency of 23.3% (stabilized 22.8%) at 300 K. We proposed that the phase transition and lattice distortion in perovskite films during temperature cycling effectively activates the self-elimination of intrinsic defects, which contributes to the improved open-circuit voltage (1.153 to 1.229 V) and, thus, efficiency. In addition, the device without encapsulation was tested in the simulated near-space environment, demonstrating their operational feasibility and stability for practical low-temperature applications.

混合卤化物钙钛矿太阳能电池由于在寒冷环境中的独特优势，已发现其在地面应用之外的潜在应用。不幸的是，先驱技术在设备效率方面受到限制，而在低温下的运行机制仍然不清楚。在这里，我们揭示了（FA，MA，Cs）Pb（I，Br）_3的显着性能增强钙钛矿型太阳能电池在290至180 K的温度下。值得注意的是，该器件在220 K时的最高效率为25.2％（稳定的24.2％），而在300 K时，其认证效率为23.3％（稳定的22.8％）。我们提出，钙钛矿薄膜在温度循环过程中的相变和晶格畸变可有效激活固有缺陷的自消除，从而有助于改善开路电压（1.153至1.229 V），从而提高效率。此外，未封装的器件在模拟的近太空环境中进行了测试，证明了其在实际低温应用中的操作可行性和稳定性。