Synergetic Co-Modulation of Crystallization and Co-Passivation of Defects for FAPbI_3 Perovskite Solar Cells

Wang Minhuan; Yin Yanfeng; Cai WanxianLiu JingHan YalingFeng YulinDong QingshunWang YudiBian JimingShi Yantao

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Synergetic Co-Modulation of Crystallization and Co-Passivation of Defects for FAPbI_3 Perovskite Solar Cells

机译：Synergetic Co-Modulation of Crystallization and Co-Passivation of Defects for FAPbI_3 Perovskite Solar Cells

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Enhancing crystallinity, passivating the grain boundary and interfacial defects have been validated to be critical for improving the power conversion efficiency (PCE) and stability of perovskite solar cells (PSCs). Herein, a synergetic co-modulation and co-passivation strategy is proposed to simultaneously enhance crystallinity and passivate the grain boundary and surface defects of FAPbI(3) based PSCs. The 4-fluoro-phenethylammonium iodide (4-F-PEAI) added in precursor solution and poly (9-vinylcarbazole) (PVK) added in antisolvent can jointly modulate the crystallization of FAPbI(3) films. The 4-F-PEAI-derived 2D perovskite, which is spontaneously formed at the grain boundaries of FAPbI(3), can passivate the defects effectively. In the meantime, PVK left on top of a FAPbI(3) layer can passivate the surface defects and meanwhile function as an interfacial barrier layer between FAPbI(3) and hole transport layer (HTL) to mitigate the detrimental interfacial charge recombination. With the holistic benefit of the enhanced crystallinity, reduced defects and trap sites, and mitigated non-radiative recombination and suppressed ion migration, the encouraging PCEs up to 21.6% is achieved for the resulting modified PSCs. Additionally, this strategy endows the device with notably enhanced operational stability under continuous exposure to illumination, with more than 84% of the initial PCE being maintained after continuous illumination for 800 h.

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《Advanced functional materials》 |2022年第6期|2108567.1-2108567.9|共9页
作者
Wang Minhuan; Yin Yanfeng; Cai WanxianLiu JingHan YalingFeng YulinDong QingshunWang YudiBian JimingShi Yantao;
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Dalian Univ Technol, Key Lab Mat Modificat Laser Ion & Electron Beams, Minist Educ, Sch Phys, Dalian 116024, Peoples R China|Dalian Univ Technol, State Key Lab Fine Chem, Sch Chem, Dalian 116024, Peoples R China|Dalian Univ Technol, Sch Microelect, Dalian;

Dalian Univ Technol, Sch Microelect, Dalian 116024, Peoples R China;

Dalian Univ Technol, State Key Lab Fine Chem, Sch Chem, Dalian 116024, Peoples R ChinaDalian Univ Technol, Key Lab Mat Modificat Laser Ion & Electron Beams, Minist Educ, Sch Phys, Dalian 116024, Peoples R ChinaDalian Univ Technol, Key Lab Mat Modificat Laser Ion & Electron Beams, Minist Educ, Sch Phys, Dalian 116024, Peoples R China|Dalian Univ Technol, Sch Microelect, Dalian 116024, Peoples R China;

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co-modulation; co-passivation; defects; Perovskite solar cells; operational stability;

Synergetic Co-Modulation of Crystallization and Co-Passivation of Defects for FAPbI_3 Perovskite Solar Cells

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