Wu Rongfei, Yin Ran, Wang Kexiang, Miao Wenjing, Sun Weiwei, Huo Xiaonan, Sun Yansheng, You Tingting, Yin Penggang
School of Chemistry, Beihang University, Beijing, 100191, China.
School of Physics, Beihang University, Beijing, 100191, China.
Small Methods. 2025 Mar;9(3):e2401045. doi: 10.1002/smtd.202401045. Epub 2024 Nov 21.
Inverted perovskite solar cells (PSCs) have captured significant interest due to their outstanding stability, cost-effective fabrication process, and good compatibility with flexible and tandem devices. The presence of bulk and surface defects is key factor in PSCs that cause non-radiative recombination and degradation. To improve the efficiency and stability of inverted PSCs, a bulk-to-surface dual-passivation strategy is employed by utilizing Oleylamine Iodide (OAmI) as additives and 4-Fluorobenzylamine Hydroiodide (4-F-PMAI) as surface passivating agents. Utilizing OAmI as bulk passivation can enhance the crystallinity of perovskite films and reduce lattice defects. Meanwhile, 4-F-PMAI further suppresses non-radiative recombination and reduces open-circuit voltage (V) loss through bidentate anchoring. Consequently, the dual-passivation strategy significantly enhances device performance, boosting the power conversion efficiency (PCE) of PSCs to 24.26%, with a V of 1.15V. Moreover, the unencapsulated PSCs show excellent long-term stability maintaining over 85% and 90% of the initial efficiency under 85 °C thermal annealing in N for 1000 hours and after storage in ambient conditions (RH: 30 ± 5%) for 1000 hours.
倒置钙钛矿太阳能电池（PSCs）因其出色的稳定性、具有成本效益的制造工艺以及与柔性和串联器件的良好兼容性而备受关注。体缺陷和表面缺陷的存在是导致PSCs发生非辐射复合和降解的关键因素。为了提高倒置PSCs的效率和稳定性，采用了一种体到表面的双钝化策略，即利用碘化油胺（OAmI）作为添加剂，4-氟苄胺氢碘酸盐（4-F-PMAI）作为表面钝化剂。使用OAmI进行体钝化可以提高钙钛矿薄膜的结晶度并减少晶格缺陷。同时，4-F-PMAI通过双齿锚定进一步抑制非辐射复合并减少开路电压（V）损失。因此，双钝化策略显著提高了器件性能，将PSCs的功率转换效率（PCE）提高到24.26%，V为1.15V。此外，未封装的PSCs表现出优异的长期稳定性，在85°C的氮气中热退火1000小时以及在环境条件（相对湿度：30±5%）下储存1000小时后，仍保持初始效率的85%和90%以上。
