Lin Wenhui, Wu Jihuai, Tian Jingxu, Lin Yuhe, Yang Puzhao, Huang Yongheng, Jiang Xiaoyuan, Gao Lin, Wang Ying, Sun Weihai, Lan Zhang, Huang Miaoliang
Engineering Research Center of Environment-Friendly Functional Materials, Ministry of Education, College of Materials Science and Engineering, Huaqiao University, Xiamen 361021, China.
ACS Appl Mater Interfaces. 2023 Aug 2;15(30):36468-36476. doi: 10.1021/acsami.3c08583. Epub 2023 Jul 24.
The quality of the perovskite active layer directly impacts the photovoltaic performance of perovskite solar cells (PSCs). Unfortunately, perovskite films produced through solution methods often have a significant number of defects on their surface, which lead to a substantial degradation in the performance of devices. For this reason, a multifunctional additive 2-(trifluoromethyl) benzimidazole (TFMBI) is introduced into perovskite films. Based on the Lewis acid/base coordination principle, the TFMBI double site cooperatively passivates surface defects, inhibiting carrier non-radiative recombination. Simultaneously, the hydrophobic solid group (-CF) of TFMBI covers the surface, establishing a moisture-oxygen barrier and improving the environmental stability of the devices. In consequence, the power conversion efficiency (PCE) of TFMBI-modified PSCs reached 23.16%, significantly higher than the pristine one with a PCE of 20.62%. Additionally, the unencapsulated target device retained 90.32% of its initial PCE even after being reserved in the air with a relative humidity of 20-30% for 60 days.
钙钛矿活性层的质量直接影响钙钛矿太阳能电池（PSC）的光伏性能。不幸的是，通过溶液法制备的钙钛矿薄膜表面通常存在大量缺陷，这导致器件性能大幅下降。因此，将多功能添加剂2-（三氟甲基）苯并咪唑（TFMBI）引入钙钛矿薄膜中。基于路易斯酸/碱配位原理，TFMBI的双位点协同钝化表面缺陷，抑制载流子非辐射复合。同时，TFMBI的疏水固体基团（-CF）覆盖表面，建立起防潮氧屏障，提高了器件的环境稳定性。结果，TFMBI修饰的PSC的功率转换效率（PCE）达到23.16%，显著高于原始器件的20.62%。此外，未封装的目标器件即使在相对湿度为20-30%的空气中保存60天后，仍保留其初始PCE的90.32%。
