Tan Haiting, Yu Xue, Ren Weibin, Yin Tianzhou, Wen Haoxin, Guo Yixuan, Zhang Zimin, Liu Chuangping, Zhou Gangsheng, Li Hao, Qiu Xijie, Wu Hualin, Yang Zhi, Huang Shaoming
Guangzhou Key Laboratory of Low-Dimensional Materials and Energy Storage Devices, Collaborative Innovation Center of Advanced Energy Materials, School of Materials and Energy, Guangdong University of Technology, Guangzhou, 510006, PR China.
State Key Laboratory of Luminescent Materials and Devices, South China University of Technology, Guangzhou, 510640, China.
Small. 2025 May;21(20):e2500978. doi: 10.1002/smll.202500978. Epub 2025 Apr 3.
Buried interface in perovskite solar cells (PSCs) is a critical determination for the performance and stability because it dominates the crystallization of the perovskite layer, non-radiative recombination, and ion migration at the interfaces. Herein, a novel versatile modifier, potassium sucrose octasulfate (KSOS) which is rich in sulfonic groups and potassium ions, is introduced for bridging the buried perovskite and SnO interface, to improve the interfacial states and further the device performance. It is found that KSOS serves as a bridge that can not only passivate defects in perovskite and SnO through multi-site strengthening chemical binding, thus effectively inhibiting non-radiation recombination and suppressing ion migration, but also can optimize the surface state of SnO layer, improve the crystallization of perovskite absorber, thus ultimately achieving a gratifying efficiency of 25.32% with negligible hysteresis. What's more, the optimized device delivers admirable stability sustaining over 90% of initial power conversion efficiency after being aged under continuous 85 °C heating stress with 40 ± 5% RH humidity for ≈600 and ≈1200 h under continuous 1-sun illumination, respectively.
钙钛矿太阳能电池（PSCs）中的掩埋界面对于其性能和稳定性至关重要，因为它主导着钙钛矿层的结晶、非辐射复合以及界面处的离子迁移。在此，引入了一种新型多功能改性剂——八硫酸蔗糖钾（KSOS），其富含磺酸基团和钾离子，用于连接掩埋的钙钛矿和SnO界面，以改善界面态并进一步提升器件性能。研究发现，KSOS充当了一座桥梁，它不仅可以通过多位点强化化学键合来钝化钙钛矿和SnO中的缺陷，从而有效抑制非辐射复合并抑制离子迁移，还能够优化SnO层的表面态，改善钙钛矿吸收层的结晶，最终实现了25.32%的可观效率且滞后可忽略不计。此外，优化后的器件具有出色的稳定性，在连续85°C加热应力和40±5%相对湿度条件下，分别在连续1个太阳光照下老化约600小时和约1200小时后，仍能保持超过初始功率转换效率的90%。
