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	Polydentate Ligand Reinforced Chelating to Stabilize Buried Interface toward High-Performance Perovskite Solar Cells
	Liu, Baibai1; Zhou, Qian1; Li, Yong2; Chen, Yu1; He, Dongmei1; Ma, Danqing1; Han, Xiao1; Li, Ru1; Yang, Ke3; Yang, Yingguo4
	2024-01-18
摘要	The instability of the buried interface poses a serious challenge for commercializing perovskite photovoltaic technology. Herein, we report a polydentate ligand reinforced chelating strategy to strengthen the stability of buried interface by managing interfacial defects and stress. The bis(2,2,2-trifluoroethyl) (methoxycarbonylmethyl)phosphonate (BTP) is employed to manipulate the buried interface. The C=O, P=O and two -CF3 functional groups in BTP synergistically passivate the defects from the surface of SnO2 and the bottom surface of the perovskite layer. Moreover, The BTP modification contributes to mitigated interfacial residual tensile stress, promoted perovskite crystallization, and reduced interfacial energy barrier. The multidentate ligand modulation strategy is appropriate for different perovskite compositions. Due to much reduced nonradiative recombination and heightened interface contact, the device with BTP yields a promising power conversion efficiency (PCE) of 24.63 %, which is one of the highest efficiencies ever reported for devices fabricated in the air environment. The unencapsulated BTP-modified devices degrade to 98.6 % and 84.2 % of their initial PCE values after over 3000 h of aging in the ambient environment and after 1728 h of thermal stress, respectively. This work provides insights into strengthening the stability of the buried interface by engineering multidentate chelating ligand molecules. A polydentate ligand reinforced chelating strategy is proposed to strengthen the stability of buried interface by managing interfacial defects and stress. The BTP-modified device achieves a promising power conversion efficiency (PCE) of 24.63 %. The unencapsulated BTP-modified devices degrade to 98.6 % and 84.2 % of their initial PCE values after over 3000 h of aging in the ambient environment and after 1728 h of thermal stress, respectively.+image
关键词	Buried Interface Chelating Perovskite Polydentate Ligand Solar Cells
DOI	10.1002/anie.202317185
发表期刊	ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
ISSN	1433-7851
页码	11
通讯作者	He, Dongmei(hedongmei@cqu.edu.cn) ; Li, Ru(ru.li@cqu.edu.cn) ; Ren, Xiaodong(renxd@ynu.edu.cn) ; Yi, Jianhong(yijianhong@kust.edu.cn) ; Chen, Jiangzhao(jiangzhaochen@cqu.edu.cn)
收录类别	SCI
WOS记录号	WOS:001144169400001
语种	英语