Ion‐Migration Inhibition by the Cation–π Interaction in Perovskite Materials for Efficient and Stable Perovskite Solar Cells |
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| Authors: | Dong Wei Fusheng Ma Rui Wang Shangyi Dou Peng Cui Hao Huang Jun Ji Endong Jia Xiaojie Jia Sajid Sajid Ahmed Mourtada Elseman Lihua Chu Yingfeng Li Bing Jiang Juan Qiao Yongbo Yuan Meicheng Li |
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| Affiliation: | 1. State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources, School of Renewable Energy, North China Electric Power University, Beijing, China;2. Key Lab of Organic Optoelectronics and Molecular Engineering of Ministry of Education, Department of Chemistry, Tsinghua University, Beijing, China;3. Key Laboratory of Solar Thermal Energy and Photovoltaic System, Institute of Electrical Engineering, Chinese Academy of Sciences, Beijing, China;4. Electronic and Magnetic Materials Department, Central Metallurgical Research and Development Institute (CMRDI), El‐Tebbin, Cairo, Egypt;5. Hunan Key Laboratory of Super‐microstructure and Ultrafast Process, School of Physics and Electronics, Central South University, Hunan, P. R. China |
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| Abstract: | Migration of ions can lead to photoinduced phase separation, degradation, and current–voltage hysteresis in perovskite solar cells (PSCs), and has become a serious drawback for the organic–inorganic hybrid perovskite materials (OIPs). Here, the inhibition of ion migration is realized by the supramolecular cation–π interaction between aromatic rubrene and organic cations in OIPs. The energy of the cation–π interaction between rubrene and perovskite is found to be as strong as 1.5 eV, which is enough to immobilize the organic cations in OIPs; this will thus will lead to the obvious reduction of defects in perovskite films and outstanding stability in devices. By employing the cation‐immobilized OIPs to fabricate perovskite solar cells (PSCs), a champion efficiency of 20.86% and certified efficiency of 20.80% with negligible hysteresis are acquired. In addition, the long‐term stability of cation‐immobilized PSCs is improved definitely (98% of the initial efficiency after 720 h operation), which is assigned to the inhibition of ionic diffusions in cation‐immobilized OIPs. This cation–π interaction between cations and the supramolecular π system enhances the stability and the performance of PSCs efficiently and would be a potential universal approach to get the more stable perovskite devices. |
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| Keywords: | cation– π interaction DFT calculations efficient and stable perovskite solar cells ion migration inhibition perovskite materials |
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