Flexible solar cells have attracted increasingly attentions due to its possible extensive applications in wearable, portable, flyable and deployable devices. The fabrication of flexible perovskite solar cells (PSCs) strictly requires the fabrication temperature below 150°C due to the limitation of flexible substrate. For retaining the process at low temperature, applying anti-solvents has becoming to the most popular method. However, the involvement of anti-solvents requires very precise control and brings toxicity in the fabrication procedures, which limits its large-scale industrial use. Here, we propose a strategy that simply replacing the usual anti-solvents with CH₃NH₃Br (CH₃NH₃⁺, MA) into dynamic spinning of perovskite precursor significantly reduces the formation energy of α-phase FA-perovskites to 40°C. An optimized annealing temperature at 100°C provides high-quality morphology and crystallization of FA-based perovskite films with superior optoelectric properties, yielding a power conversion efficiency (PCE) of flexible PSCs to 18.5% and retaining over 80% of its initial PCE after 1200 bending cycles. This is the best performance so far of preparing anti-solvent free flexible PSCs at low temperature (≤100°C). Our results offer new insights into producing high-quality FA-based perovskite materials at low temperature, which paves the way for further development of flexible PSCs to industrial commercialization.

柔性太阳能电池由于其在可穿戴，便携式，可飞行和可展开装置中的广泛应用而引起了越来越多的关注。由于柔性基板的限制，柔性钙钛矿太阳能电池（PSC）的制造严格要求制造温度低于150°C。为了将工艺保持在低温下，使用抗溶剂已成为最流行的方法。然而，抗溶剂的加入要求非常精确的控制，并且在制造过程中带来毒性，这限制了其的大规模工业用途。在这里，我们提出一种策略，只需用CH ₃ NH ₃ Br（CH ₃ NH ₃ ⁺，MA）钙钛矿前体的动态纺丝可将α相FA钙钛矿的形成能量显着降低至40°C。经过优化的100°C退火温度可提供具有优异光电性能的基于FA的钙钛矿薄膜的高质量形貌和结晶，将柔性PSC的功率转换效率（PCE）提升至18.5％，并在初始PCE之后保持80％以上的初始PCE 1200次弯曲循环。这是迄今为止在低温（≤100°C）下制备无溶剂的柔性PSC的最佳性能。我们的结果为在低温下生产高质量基于FA的钙钛矿材料提供了新的见识，这为将柔性PSC进一步开发为工业化生产铺平了道路。