Li Min, Xie Yulin, Luo Long, Zheng Ziwei, Guo Jing, He Lifei, Zheng Xin, Liu Ranran, Rong Yaoguang, Guo Rui, Li Xiong, Dong Bitao
Michael Grätzel Center for Mesoscopic Solar Cells, Wuhan National Laboratory for Optoelectronics, Huazhong University of Science and Technology, Wuhan, Hubei, 430074, China.
School of Physics and Electronic information, Huanggang Normal University, Huanggang, 438000, China.
Adv Mater. 2025 Jul;37(26):e2501057. doi: 10.1002/adma.202501057. Epub 2025 Apr 13.
The photoactive α-phase of formamidinium lead iodide perovskite (α-FAPbI) is regarded as one of the ideal materials for high-efficiency perovskite solar cells (PSCs) due to its superior optoelectronic properties. However, during the deposition of α-FAPbI perovskite films, the presence of impurity phases, such as PbI and δ-FAPbI, can cause the formation of inherent defects, which leads to suboptimal charge transport and extraction properties, as well as inadequate long-term stability in the film's morphology and structure. To address these issues, an impurity phase repair strategy is employed using FAI/MASCN mixed vapors to convert the impurity phases into light-absorbing α-FAPbI. Meanwhile, this recrystallization process also facilitates the recovery of its characteristic morphology, thereby improving efficiency and enhancing the durability of PSCs. This approach promotes the PSCs to obtain an efficiency of 26.05% (with a certified efficiency of 25.67%, and steady-state PCE of 25.41%). Additionally, this approach is suitable for the fabrication of large-area devices, obtaining a 1 cm device with a PCE of 24.52% and a mini-module (with an area of 17.1 cm) with a PCE of 22.35%. Furthermore, it is found that this strategy enables cyclic repair of aged perovskite films, with the perovskite solar cells retaining ≈ 94.3% of their initial efficiency after two cycles of repair, significantly enhancing the lifetime of the perovskite solar cells.
甲脒碘化铅钙钛矿（α-FAPbI）的光活性α相因其优异的光电性能而被视为高效钙钛矿太阳能电池（PSC）的理想材料之一。然而，在α-FAPbI钙钛矿薄膜沉积过程中，杂质相（如PbI和δ-FAPbI）的存在会导致固有缺陷的形成，从而导致电荷传输和提取性能欠佳，以及薄膜形态和结构的长期稳定性不足。为了解决这些问题，采用了一种杂质相修复策略，即使用FAI/MASCN混合蒸汽将杂质相转化为吸光的α-FAPbI。同时，这种重结晶过程也有助于恢复其特征形态，从而提高效率并增强PSC的耐久性。该方法促使PSC的效率达到26.05%（认证效率为25.67%，稳态PCE为25.41%）。此外，该方法适用于大面积器件的制造，获得了PCE为24.52%的1 cm器件和PCE为22.35%的微型模块（面积为17.1 cm）。此外，发现该策略能够对老化的钙钛矿薄膜进行循环修复，经过两个循环的修复后，钙钛矿太阳能电池保留了其初始效率的约94.3%，显著延长了钙钛矿太阳能电池的寿命。
