Furui Tan1,2, Hairen Tan1,3, Makhsud I. Saidaminov1, Mingyang Wei1, Mengxia Liu1, Anyi Mei1, Peicheng Li4, Bowen Zhang2, Chih‐Shan Tan1, Xiwen Gong1, Yongbiao Zhao1, Ahmad R. Kirmani5, Ziru Huang1, James Z. Fan1, Rafael Quintero‐Bermudez1, Junghwan Kim1, Yicheng Zhao1,4, Oleksandr Voznyy1, Yueyue Gao2, Feng Zhang2, Lee J. Richter5, Zheng‐Hong Lu4, Weifeng Zhang2, Edward H. Sargent1
1Department of Electrical and Computer Engineering, University of Toronto, Toronto, Ontario M5S 3G4, Canada
2Key Laboratory of Photovoltaic Materials, Department of Physics and Electronics, 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
4Department of Materials Science and Engineering, University of Toronto, 184 College Street, Toronto, Ontario, M5S 3E4, Canada
5Materials Science and Engineering Division, National Institute of Standards and Technology (NIST), Gaithersburg, MD, 20899 USA
Tóm tắt
AbstractOrganic–inorganic hybrid perovskite solar cells (PSCs) have seen a rapid rise in power conversion efficiencies in recent years; however, they still suffer from interfacial recombination and charge extraction losses at interfaces between the perovskite absorber and the charge–transport layers. Here, in situ back‐contact passivation (BCP) that reduces interfacial and extraction losses between the perovskite absorber and the hole transport layer (HTL) is reported. A thin layer of nondoped semiconducting polymer at the perovskite/HTL interface is introduced and it is shown that the use of the semiconductor polymer permits—in contrast with previously studied insulator‐based passivants—the use of a relatively thick passivating layer. It is shown that a flat‐band alignment between the perovskite and polymer passivation layers achieves a high photovoltage and fill factor: the resultant BCP enables a photovoltage of 1.15 V and a fill factor of 83% in 1.53 eV bandgap PSCs, leading to an efficiency of 21.6% in planar solar cells.
