Wang Jiarong, Zou Shibing, Yuan Ligang, Cheng Wei, Liu Yan, Wei Jianwu, Luo Huiming, Zhang Zheng, Huang Peng, Sun Jiaonan, Yan Keyou
School of Environment and Energy, Guangdong Provincial Key Laboratory of Solid Wastes Pollution Control and Recycling, South China University of Technology, Guangzhou 510000, China.
Department of Materials Science and Engineering, City University of Hong Kong, Kowloon 999077, Hong Kong.
ACS Appl Mater Interfaces. 2025 Sep 24;17(38):54254-54262. doi: 10.1021/acsami.5c13347. Epub 2025 Sep 11.
The instability of ','-tetrakis[-di(4-methoxyphenyl)amino]-'-spirobifluorene (spiro-OMeTAD)-based perovskite solar cells (PSCs) with lithium bis(trifluoromethane)sulfonimide doping arises from ionic shuttling and uncontrolled oxidation. Here, we introduce α-lipoic acid (LA) as a multifunctional additive to address these challenges. LA creates an acidic environment and accelerates the radical oxidation of spiro-OMeTAD, enabling the rapid formation of a stable hole transport layer while simultaneously precipitating excess Li ions to mitigate ion migration. Additionally, the carboxyl and disulfide groups of LA passivate interfacial defects between the perovskite and spiro-OMeTAD layers, suppressing nonradiative recombination and enhancing hole extraction. The optimized LA-doped devices achieve a power conversion efficiency (PCE) of 25.05% and show enhanced stability with a T of 1056 h under maximum power point (MPP) tracking, far exceeding the control's PCE of 22.54% and T of 528 h, respectively. This strategy not only streamlines the fabrication process by eliminating prolonged oxidation steps but also provides valuable insights into enhancing the operational stability of spiro-OMeTAD-based PSCs.
基于双（三氟甲烷）磺酰亚胺锂掺杂的“，”-四[-二（4-甲氧基苯基）氨基]-“-螺二芴（spiro-OMeTAD）的钙钛矿太阳能电池（PSC）的不稳定性源于离子穿梭和不受控制的氧化。在此，我们引入α-硫辛酸（LA）作为多功能添加剂来应对这些挑战。LA营造了酸性环境并加速了spiro-OMeTAD的自由基氧化，使得能够快速形成稳定的空穴传输层，同时沉淀过量的锂离子以减轻离子迁移。此外，LA的羧基和二硫键基团钝化了钙钛矿层和spiro-OMeTAD层之间的界面缺陷，抑制了非辐射复合并增强了空穴提取。优化后的LA掺杂器件实现了25.05%的功率转换效率（PCE），并在最大功率点（MPP）跟踪下显示出增强的稳定性，T为1056小时，分别远远超过对照的PCE为22.54%和T为528小时。该策略不仅通过消除冗长的氧化步骤简化了制造工艺还为提高基于spiro-OMeTAD的PSC的运行稳定性提供了有价值的见解。
