Molecular Hinges Stabilize Formamidinium-Based Perovskite Solar Cells with Compressive Strain

Congbo Shi; Qizhen Song; Hao WangSai MaChenyue WangXiao ZhangJie DouTinglu SongPengwan ChenHuanping ZhouYihua ChenCheng ZhuYang BaiQi Chen

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Molecular Hinges Stabilize Formamidinium-Based Perovskite Solar Cells with Compressive Strain

机译：Molecular Hinges Stabilize Formamidinium-Based Perovskite Solar Cells with Compressive Strain

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Formamidinium (FA)-based lead triiodide have emerged as promisinglight-harvesting materials for solar cells due to their intriguing optoelectronicproperties. However, obstacles to commercialization remain regarding theprimary intrinsic materials instability, wherein volatile organic componentsof FA~+ cations are prone to escape under operational stressors. Herein,stabilizing FA-based perovskite through toughening the interface withthe symmetric molecule of 1,1′-(Methylenedi-4,1-phenylene) bismaleimide(BMI) is reported. BMI with two maleimides can simultaneously bind withFA~+ and/or undercoordinated Pb~(2+) through chemical bonding, which alsocompresses the resultant perovskite lattice. The chemical bonding and strainmodulation synergistically not only passivate film defects, but also inhibitperovskite decomposition, thus significantly improving the intrinsic stabilityof perovskite films. As a result, the BMI-modified perovskite solar cells (PSCs)show improved power conversion efficiency (PCE) from 21.4 to 22.7 andenhanced long-term operational stability, maintaining 91.8 of the initialefficiency after 1000 h under continuous maximum power point tracking.The findings shed light on the synergetic effects of chemical interactionsand physical regulations, which opens a new avenue for stable and efficientperovskite-based optoelectronic devices.

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来源
《Advanced functional materials》 |2022年第28期|2201193.1-2201193.9|共9页
作者
Congbo Shi; Qizhen Song; Hao WangSai MaChenyue WangXiao ZhangJie DouTinglu SongPengwan ChenHuanping ZhouYihua ChenCheng ZhuYang BaiQi Chen;
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作者单位

Beijing Key Laboratory of Construction Tailorable Advanced FunctionalMaterials and Green ApplicationsMIIT Key Laboratory for Low-dimensional Quantum Structure and DevicesExperimental Center of Advanced MaterialsSchool of Materials Science and EngineeringB;

Shanghai Synchrotron Radiation Facility (SSRF)Zhangjiang LabShanghai Advanced Research InstituteChinese Academy of SciencesShanghai 201204, China;

State Key Laboratory of Explosion Science and TechnologyBeijing Institute of TechnologyBeijing 100081, ChinaSchool of Materials Science and EngineeringPeking UniversityBeijing 100871, China;

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正文语种英语
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chemical binding; density functional theory calculations; perovskite solar cells; stability; strain engineering;

Molecular Hinges Stabilize Formamidinium-Based Perovskite Solar Cells with Compressive Strain

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