State Key Laboratory for Artificial Microstructure and Mesoscopic Physics, School of Physics, Frontiers Science Center for Nano-optoelectronics and Collaborative Innovation Center of Quantum Matter, Peking University, Beijing, China.
Clarendon Laboratory, Department of Physics, University of Oxford, Oxford, UK.
Nature. 2024 Nov;635(8040):874-881. doi: 10.1038/s41586-024-08159-5. Epub 2024 Oct 14.
Obtaining micron-thick perovskite films of high quality is key to realizing efficient and stable positive (p)-intrinsic (i)-negative (n) perovskite solar cells, but it remains a challenge. Here we report an effective method for producing high-quality, micron-thick formamidinium-based perovskite films by forming coherent grain boundaries, in which high-Miller-index-oriented grains grow on the low-Miller-index-oriented grains in a stabilized atmosphere. The resulting micron-thick perovskite films, with enhanced grain boundaries and grains, showed stable material properties and outstanding optoelectronic performances. The small-area solar cells achieved efficiencies of 26.1%. The 1-cm devices and 5 cm × 5 cm mini-modules delivered efficiencies of 24.3% and 21.4%, respectively. The devices processed in a stabilized atmosphere presented a high reproducibility across all four seasons. The encapsulated devices exhibited superior long-term stability under both light and thermal stressors in ambient air.
获得高质量的微米级钙钛矿薄膜是实现高效稳定的正（p）本征（i）负（n）钙钛矿太阳能电池的关键，但这仍然是一个挑战。在这里，我们报告了一种通过形成相干晶界来制备高质量微米级甲脒基钙钛矿薄膜的有效方法，其中在稳定的气氛中，高米勒指数取向的晶粒在低米勒指数取向的晶粒上生长。所得的微米级钙钛矿薄膜具有增强的晶界和晶粒，表现出稳定的材料性质和优异的光电性能。小面积太阳能电池的效率达到了 26.1%。1 平方厘米的器件和 5 厘米×5 厘米的迷你模块的效率分别达到了 24.3%和 21.4%。在稳定气氛下处理的器件在四个季节都具有很高的重现性。封装器件在环境空气中的光照和热应力下表现出优异的长期稳定性。
