The device stability and toxic-solvent-free processing are indispensable development to industrialize organometal halide perovskite solar cells. In this work, the conventional top surface of vapor prepared 3D-MAPbI₃ was replaced by 2D-(BA)₂(MA)_n‐1Pb_nI_3n+1 perovskite platelet via molecular substitution from MA (CH₃NH) to BA (C₄H₉NH₂). Our fully vapor process fabricated a 3D-2D perovskite heterojunction for solar cell application, realizing the power conversion efficiency as high as 16.50% and the average one as 15.40%. Furthermore, unencapsulated devices can sustain their 81% efficiency after 30 days under 55% RH, and also 74% efficiency after 30 days under 80 °C heat stress. Stability of humidity resistance arises from the reduced n value of 2D perovskite caused by the surface reaction of moisture, and the improvement of thermal stability comes from the buffering of MA molecules release. Meanwhile, the fabrication of large scale device with high efficiency is also demonstrated in our experiment.

装置稳定性和无毒溶剂处理是有机金属卤化物钙钛矿太阳能电池工业化不可或缺的开发。在这项工作中，通过从MA（CH ₃ NH）到BA的分子取代，将蒸汽制备的3D-MAPbI ₃的常规顶面替换为2D-（BA）₂（MA）_n-1 Pb _n I _{3n + 1}钙钛矿血小板。（C ₄ H ₉ NH ₂）。我们的全蒸气工艺为太阳能电池应用制造了3D-2D钙钛矿异质结，实现了高达16.50％的功率转换效率和平均15.40％的功率转换效率。此外，未封装的器件在55％RH下30天后仍可保持81％的效率，而在80°C热应力下30天后仍可保持74％的效率。耐湿性的稳定性是由于水分的表面反应导致2D钙钛矿的n值降低而引起的，而热稳定性的提高则归因于MA分子释放的缓冲。同时，我们的实验也证明了高效率的大型器件的制造。