Liu Nanliu, Zou Qingqing, Li Ying, Li Guoting, Chen Yan, Liang Rongzhou, Liu Sijin, Lu Shiwei, Wang WeiKe, Ji Bing, Ke Lili, Nie Guozheng, Zhou Hongpeng, Liu Biao, Zhai Yaxin, Guo Yuanyuan, Wang Jifei
School of Physics and Electronics, Qiannan Normal University for Nationalities, Duyun, Guizhou, 558000, P.R. China.
Key Laboratory of Low-Dimensional Quantum Structures and Quantum Control of Ministry of Education, Department of Physics, Hunan Normal University, Changsha, 410081, P.R. China.
Angew Chem Int Ed Engl. 2025 Jul;64(27):e202500131. doi: 10.1002/anie.202500131. Epub 2025 May 6.
The undesired phase distribution and intrinsic residual lattice strain remain the bottleneck for high-performance and stable 2D or Q-2D perovskite solar cells (PSCs), especially for the Dion-Jacobson (DJ) type Q-2D PSCs. Here, we showcase employing halogen bonds to stabilize the halide anions and fine-tuning the residual lattice strain by introducing perfluorodecyl iodide (PFI). It reduces the density of iodide species defects and releases the residual tensile strain, leading to more homogenous phase distribution, suppressed carrier recombination, promoted charge transport, enhanced efficiency, and stability. Therefore, DJ PSCs maintain over 81% of initial efficiency after thermal-light aging (i.e., under 85 °C and 1 sun illumination) for 952 h, and remain over 91% of initial efficiency after under reverse bias (-2.5 V, under ISOS-V aging tests) for over 21 h, representing one of the most bias-stable Q-2D PSCs reported so far.
不需要的相分布和固有残余晶格应变仍然是高性能和稳定的二维或准二维钙钛矿太阳能电池（PSC）的瓶颈，特别是对于狄翁-雅各布森（DJ）型准二维PSC。在此，我们展示了利用卤素键来稳定卤化物阴离子，并通过引入全氟癸基碘（PFI）来微调残余晶格应变。它降低了碘化物物种缺陷的密度并释放了残余拉伸应变，导致更均匀的相分布、抑制载流子复合、促进电荷传输、提高效率和稳定性。因此，DJ型PSC在热光老化（即85°C和1个太阳光照下）952小时后保持超过初始效率的81%，在反向偏压（-2.5 V，在ISOS-V老化测试下）超过21小时后保持超过初始效率的91%，代表了迄今为止报道的最具偏压稳定性的准二维PSC之一。
