Department of Electrical and Computer Engineering, University of Toronto, 10 King's College Road, Toronto, Ontario M5S 3G4, Canada.
Laboratory of Photonics and Interfaces, Ecole Polytechnique Fédérale de Lausanne, 1015 Lausanne, Switzerland.
Science. 2023 Jul 14;381(6654):209-215. doi: 10.1126/science.adi4107. Epub 2023 Jul 13.
Perovskite solar cells (PSCs) consisting of interfacial two- and three-dimensional heterostructures that incorporate ammonium ligand intercalation have enabled rapid progress toward the goal of uniting performance with stability. However, as the field continues to seek ever-higher durability, additional tools that avoid progressive ligand intercalation are needed to minimize degradation at high temperatures. We used ammonium ligands that are nonreactive with the bulk of perovskites and investigated a library that varies ligand molecular structure systematically. We found that fluorinated aniliniums offer interfacial passivation and simultaneously minimize reactivity with perovskites. Using this approach, we report a certified quasi-steady-state power-conversion efficiency of 24.09% for inverted-structure PSCs. In an encapsulated device operating at 85°C and 50% relative humidity, we document a 1560-hour at maximum power point under 1-sun illumination.
钙钛矿太阳能电池（PSCs）由界面二维和三维异质结构组成，其中包含铵配体插层，这使得在将性能与稳定性结合方面取得了快速进展。然而，随着该领域继续寻求更高的耐久性，需要避免配体逐步插层的其他工具，以最大限度地减少高温下的降解。我们使用了与钙钛矿主体不反应的铵配体，并系统地研究了一个配体分子结构变化的库。我们发现，氟化苯胺基提供了界面钝化，同时最大限度地减少了与钙钛矿的反应性。使用这种方法，我们报告了倒置结构 PSCs 的认证准稳态功率转换效率为 24.09%。在封装的设备中，在 85°C 和 50%相对湿度下，我们记录了在 1 个太阳光照下的最大功率点下的 1560 小时 。
