Duan Linrui, Liu Siyu, Wang Xiaobing, Zhang Zhuang, Luo Jingshan
Institute of Photoelectronic Thin Film Devices and Technology, State Key Laboratory of Photovoltaic Materials and Cells, Tianjin Key Laboratory of Efficient Solar Energy Utilization, Ministry of Education Engineering Research Center of Thin Film Photoelectronic Technology, Nankai University, Tianjin, 300350, China.
Frontiers Science Center for New Organic Matter, Nankai University, Tianjin, 300071, China.
Adv Sci (Weinh). 2024 Sep;11(33):e2402796. doi: 10.1002/advs.202402796. Epub 2024 Jul 3.
The buried interface between the electron transport layer (ETL) and the perovskite layer plays a crucial role in enhancing the power conversion efficiency (PCE) and stability of n-i-p type perovskite solar cells (PSCs). In this study, the interface between the chemical bath deposited (CBD) titanium oxide (TiO) ETL and the perovskite layer using multi-functional potassium trifluoromethyl sulfonate (SK) is modified. Structural and elemental analyses reveal that the trifluoromethyl sulfonate serves as a crosslinker between the TiO and the perovskite layer, thus improving the adhesion of the perovskite to the TiO ETL through strong bonding of the ─CF and ─SO terminal groups. Furthermore, the multi-functional modifiers reduced interface defects and suppressed carrier recombination in the PSCs. Consequently, devices with a champion PCE of 25.22% and a fill factor (FF) close to 85% is achieved, marking the highest PCE and FF observed for PSCs based on CBD TiO. The unencapsulated device maintained 81.3% of its initial PCE after operating for 1000 h.
电子传输层（ETL）与钙钛矿层之间的埋入界面在提高n-i-p型钙钛矿太阳能电池（PSC）的功率转换效率（PCE）和稳定性方面起着关键作用。在本研究中，对化学浴沉积（CBD）的氧化钛（TiO）ETL与使用多功能三氟甲基磺酸钾（SK）的钙钛矿层之间的界面进行了改性。结构和元素分析表明，三氟甲基磺酸盐充当TiO与钙钛矿层之间的交联剂，从而通过─CF和─SO端基的强键合提高钙钛矿与TiO ETL的附着力。此外，多功能改性剂减少了界面缺陷并抑制了PSC中的载流子复合。因此，实现了具有25.22%的最佳PCE和接近85%的填充因子（FF）的器件，这是基于CBD TiO的PSC所观察到的最高PCE和FF。未封装的器件在运行1000小时后保持其初始PCE的81.3%。
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