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Spontaneous Formation of Upper Gradient 2D Structure for Efficient and Stable Quasi‐2D Perovskites
Author(s) -
Li Dengxue,
Xing Zhi,
Huang Lu,
Meng Xiangchuan,
Hu Xiaotian,
Hu Ting,
Chen Yiwang
Publication year - 2021
Publication title -
advanced materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 10.707
H-Index - 527
eISSN - 1521-4095
pISSN - 0935-9648
DOI - 10.1002/adma.202101823
Subject(s) - materials science , passivation , perovskite (structure) , methylamine , energy conversion efficiency , ion , chemical physics , chemical engineering , decomposition , thermal decomposition , thermal stability , trifluoromethyl , structural stability , nanotechnology , optoelectronics , layer (electronics) , organic chemistry , alkyl , chemistry , physics , engineering , structural engineering
Abstract Highly efficient and stable quasi‐2D hybrid perovskite solar cells (PSCs) using hydrophobic 4‐(trifluoromethyl) benzylamine (4TFBZA) as the spacer cation are successfully demonstrated. It is found that the incorporation of hydrophobic 4TFBZA into MAPbI 3 can effectively induce a spontaneous upper gradient 2D (SUG‐2D) structure, passivate the trap states, and restrain the ion motion. Meanwhile, the strong hydrogen bonding of F···HN between 4TFBZA ions and methylamine ions can effectively suppress the decomposition of perovskite, which gives the device a better thermal stability. Besides, due to the SUG‐2D structure with hydrophobic 4TFBZA, the device also exhibits a better moisture stability. The SUG‐2D‐structure‐based device exhibits a power conversion efficiency of 17.07% with a high open‐circuit voltage of 1.10 V and a notable fill factor of 71%. This work provides a new strategy for constructing efficient and stable quasi‐2D PSCs, and it is an inspiration for the packaging strategy of perovskites.