Interfacial defect passivation by novel phosphonium salts yields 22% efficiency perovskite solar cells: Experimental and theoretical evidence
Dongmei He,
Tingwei Zhou,
Baibai Liu,
Le Bai,
Wenqi Wang,
Hongkuan Yuan,
Cunyun Xu,
Qunliang Song,
Donghwa Lee,
Zhigang Zang,
Liming Ding,
Jiangzhao Chen
Affiliations
Dongmei He
Key Laboratory of Optoelectronic Technology & Systems (MoE), College of Optoelectronic Engineering Chongqing University Chongqing China
Tingwei Zhou
School of Physical Science and Technology Southwest University Chongqing China
Baibai Liu
Key Laboratory of Optoelectronic Technology & Systems (MoE), College of Optoelectronic Engineering Chongqing University Chongqing China
Le Bai
Key Laboratory of Optoelectronic Technology & Systems (MoE), College of Optoelectronic Engineering Chongqing University Chongqing China
Wenqi Wang
Key Laboratory of Optoelectronic Technology & Systems (MoE), College of Optoelectronic Engineering Chongqing University Chongqing China
Hongkuan Yuan
School of Physical Science and Technology Southwest University Chongqing China
Cunyun Xu
Institute for Clean Energy and Advanced Materials, School of Materials and Energy Southwest University Chongqing China
Qunliang Song
Institute for Clean Energy and Advanced Materials, School of Materials and Energy Southwest University Chongqing China
Donghwa Lee
Department of Materials Science and Engineering Pohang University of Science and Technology Pohang South Korea
Zhigang Zang
Key Laboratory of Optoelectronic Technology & Systems (MoE), College of Optoelectronic Engineering Chongqing University Chongqing China
Liming Ding
Center for Excellence in Nanoscience (CAS), Key Laboratory of Nanosystem and Hierarchical Fabrication (CAS) National Center for Nanoscience and Technology Beijing China
Jiangzhao Chen
Key Laboratory of Optoelectronic Technology & Systems (MoE), College of Optoelectronic Engineering Chongqing University Chongqing China
Abstract We modified perovskite/Spiro‐OMeTAD interface by using two novel phosphonium salts containing PF6− counter anion (i.e., ClTPPPF6 and BrTPPPF6). The cation and anion in phosphonium salts possess not only ionic bonds but also coordination bonds with perovskites. The anion and cation vacancies at the surface and GBs of perovskite films can be filled by phosphonium cations and PF6− anions, respectively, resulting in reduced defect density and prolonged carrier lifetimes. The stronger chemical interaction and accordingly better defect passivation were certified for BrTPPPF6 than ClTPPPF6. As a result, the devices modified by ClTPPPF6 and BrTPPPF6 deliver a PCE of 21.73% and 22.15%, respectively, which far exceed 20.6% of the control device. The unsealed BrTPPPF6 modified device maintains 98.2% of its initial efficiency value after thermal aging of 1320 h whereas merely 84.7% for the control device. 96.4% of its original efficiency was retained for BrTPPPF6‐modified device after ambient exposure of 2016 h.
