Tang Senlin, Peng Ying, Zhu Zheng, Zong Jiawei, Zhao Lian, Yu Longsheng, Chen Runfeng, Li Mingguang
State Key Laboratory of Organic Electronics and Information Displays & Institute of Advanced Materials (IAM), Nanjing University of Posts & Telecommunications, 9 Wenyuan Road, Nanjing 210023, China.
J Phys Chem Lett. 2022 Jun 3:5116-5122. doi: 10.1021/acs.jpclett.2c01089.
Structural defects in the bulk and on the surface of the perovskite layer serving as trap sites induce nonradiative recombination losses, limiting the performance improvement of perovskite solar cells (PSCs). Herein, we report a trometamol-induced dual passivation (TIDP) strategy to fix both bulk and surface defects of perovskites, where the trometamol molecule can simultaneously act as chemical additive and surface-modification agent. Studies show that trometamol as an additive can effectively reduce ionic defects and enhance the grain size of perovskites through Pb/-NH coordination bonds and I/-OH hydrogen bonds. As a surface-modification agent, trometamol further passivates ionic defects at the upper surface of the perovskite layer. As a result of the TIDP approach, a remarkable efficiency augmentation from 17.25% to 19.17% and an optimized thermal stability under inert conditions have been realized. These results highlight the importance of the TIDP strategy in perovskite defect management for excellent photovoltaic properties, facilitating the fabrication of high-performance PSCs.
作为陷阱位点的钙钛矿层体相和表面的结构缺陷会引发非辐射复合损失，限制了钙钛矿太阳能电池（PSC）性能的提升。在此，我们报道了一种氨基丁三醇诱导的双钝化（TIDP）策略，以修复钙钛矿的体相和表面缺陷，其中氨基丁三醇分子可同时充当化学添加剂和表面改性剂。研究表明，氨基丁三醇作为添加剂可通过Pb/-NH配位键和I/-OH氢键有效减少离子缺陷并增大钙钛矿的晶粒尺寸。作为表面改性剂，氨基丁三醇进一步钝化了钙钛矿层上表面的离子缺陷。采用TIDP方法后，实现了效率从17.25%显著提高到19.17%，并在惰性条件下实现了优化的热稳定性。这些结果凸显了TIDP策略在钙钛矿缺陷管理以实现优异光伏性能方面的重要性，有助于高性能PSC的制备。
