Liu Cheng, Yang Yi, Rakstys Kasparas, Mahata Arup, Franckevicius Marius, Mosconi Edoardo, Skackauskaite Raminta, Ding Bin, Brooks Keith G, Usiobo Onovbaramwen Jennifer, Audinot Jean-Nicolas, Kanda Hiroyuki, Driukas Simonas, Kavaliauskaite Gabriele, Gulbinas Vidmantas, Dessimoz Marc, Getautis Vytautas, De Angelis Filippo, Ding Yong, Dai Songyuan, Dyson Paul J, Nazeeruddin Mohammad Khaja
State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources, North China Electric Power University, Beijing, 102206, People's Republic of China.
Institute of Chemical Sciences and Engineering, EPFL VALAIS, Sion, 1951, Switzerland.
Nat Commun. 2021 Nov 4;12(1):6394. doi: 10.1038/s41467-021-26754-2.
Organic halide salt passivation is considered to be an essential strategy to reduce defects in state-of-the-art perovskite solar cells (PSCs). This strategy, however, suffers from the inevitable formation of in-plane favored two-dimensional (2D) perovskite layers with impaired charge transport, especially under thermal conditions, impeding photovoltaic performance and device scale-up. To overcome this limitation, we studied the energy barrier of 2D perovskite formation from ortho-, meta- and para-isomers of (phenylene)di(ethylammonium) iodide (PDEAI) that were designed for tailored defect passivation. Treatment with the most sterically hindered ortho-isomer not only prevents the formation of surficial 2D perovskite film, even at elevated temperatures, but also maximizes the passivation effect on both shallow- and deep-level defects. The ensuing PSCs achieve an efficiency of 23.9% with long-term operational stability (over 1000 h). Importantly, a record efficiency of 21.4% for the perovskite module with an active area of 26 cm was achieved.
有机卤化物盐钝化被认为是减少先进钙钛矿太阳能电池（PSC）中缺陷的一项重要策略。然而，该策略存在不可避免的问题，即在面内优先形成电荷传输受损的二维（2D）钙钛矿层，尤其是在热条件下，这会阻碍光伏性能和器件放大。为克服这一限制，我们研究了用于定制缺陷钝化的（亚苯基）二（乙铵）碘化物（PDEAI）的邻、间、对异构体形成2D钙钛矿的能垒。用空间位阻最大的邻位异构体处理不仅能防止表面2D钙钛矿膜的形成，即使在高温下也是如此，而且还能最大限度地提高对浅能级和深能级缺陷的钝化效果。由此制备的PSC实现了23.9%的效率以及长期运行稳定性（超过1000小时）。重要的是，对于有效面积为26平方厘米的钙钛矿组件，实现了21.4%的创纪录效率。
