Furui Tan1,2, Makhsud I. Saidaminov1, Hairen Tan3, James Z. Fan1, Yuhang Wang1, Shizhong Yue4, Xiaotian Wang5, Zhitao Shen2, Shengjun Li2, Junhwan Kim1,6, Yueyue Gao2, Gentian Yue2, Rong Liu2, Ziru Huang1, Chen Dong2, Xiao Hu2, Weifeng Zhang2, Zhijie Wang4, Shengchun Qu4, Zhanguo Wang4, Edward H. Sargent1
1Department of Electrical and Computer Engineering, University of Toronto, Toronto, Ontario M5S 3G4, Canada
2Key Laboratory of Photovoltaic Materials, Henan University, Kaifeng, Henan, 475004, China
3National Laboratory of Solid State Microstructures, Jiangsu Key Laboratory of Artificial Functional Materials, College of Engineering and Applied Sciences, Nanjing University, Nanjing, 210093, China
4Key Laboratory of Semiconductor Materials Science, Beijing Key Laboratory of Low Dimensional Semiconductor Materials and Devices, Institute of Semiconductors, Chinese Academy of Sciences, Beijing, 100083, China
5School of Civil Engineering, Hefei University of Technology, Hefei 230009, China
6Photo-electronic Hybrids Research Center, Korea Institute of Science and Technology (KIST), Seoul, 02792 Korea
Tóm tắt
AbstractCharge recombination due to interfacial defects is an important source of loss in perovskite solar cells. Here, a two‐sided passivation strategy is implemented by incorporating a bilinker molecule, thiophene‐based carboxylic acid (TCA), which passivates defects on both the perovskite side and the TiO2 side of the electron‐extracting heterojunction in perovskite solar cells. Density functional theory and ultrafast charge dynamics reveal a 50% reduction in charge recombination at this interface. Perovskite solar cells made using TCA‐passivated heterojunctions achieve a power conversion efficiency of 21.2% compared to 19.8% for control cells. The TCA‐containing cells retain 96% of initial efficiency following 50 h of UV‐filtered MPP testing.
