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	Stabilizing Top Interface by Molecular Locking Strategy with Polydentate Chelating Biomaterials toward Efficient and Stable Perovskite Solar Cells in Ambient Air
	Liu, Baibai1; Ren, Xiaodong2; Li, Ru1; Chen, Yu1; He, Dongmei1,3; Li, Yong4; Zhou, Qian1; Ma, Danqing1; Han, Xiao1; Shai, Xuxia5
	2024-02-09
摘要	The instability of top interface induced by interfacial defects and residual tensile strain hinders the realization of long-term stable n-i-p regular perovskite solar cells (PSCs). Herein, one molecular locking strategy is reported to stabilize top interface by adopting polydentate ligand green biomaterial 2-deoxy-2,2-difluoro-d-erythro-pentafuranous-1-ulose-3,5-dibenzoate (DDPUD) to manipulate the surface and grain boundaries of perovskite films. Both experimental and theoretical evidence collectively uncover that the uncoordinated Pb2+ ions, halide vacancy, and/or IPb antisite defects can be effectively healed and locked by firm chemical anchoring on the surface of perovskite films. The ingenious polydentate ligand chelating is translated into reduced interfacial defects, increased carrier lifetimes, released interfacial stress, and enhanced moisture resistance, which should be liable for strengthened top interface stability and inhibited interfacial nonradiative recombination. The universality of the molecular locking strategy is certified by employing different perovskite compositions. The DDPUD modification achieves an enhanced power conversion efficiency (PCE) of 23.17-24.47%, which is one of the highest PCEs ever reported for the devices prepared in ambient air. The unsealed DDPUD-modified devices maintain 98.18% and 88.10% of their initial PCEs after more than 3000 h under a relative humidity of 10-20% and after 1728 h at 65 degrees C, respectively. The molecular locking strategy is proposed to stabilize top interface by adopting polydentate ligand green biomaterial 2-deoxy-2,2-difluoro-d-erythro-pentafuranous-1-ulose-3,5-dibenzoate (DDPUD) to manipulate the surface and grain boundaries of perovskite films. The ingenious polydentate ligand chelating is translated into reduced interfacial defects, released interfacial stress, and enhanced moisture resistance. The DDPUD-modified device achieves an enhancement in power conversion efficiency (PCE) from 23.17% to 24.47%. image
关键词	molecular locking strategy perovskite solar cells polydentate ligand chelating stability top interface
DOI	10.1002/adma.202312679
发表期刊	ADVANCED MATERIALS
ISSN	0935-9648
页码	10
通讯作者	He, Dongmei(hedongmei@cqu.edu.cn) ; Shai, Xuxia(xuxiashai@kust.edu.cn) ; Chen, Cong(chencong@hebut.edu.cn) ; Yi, Jianhong(yijianhong@kust.edu.cn) ; Chen, Jiangzhao(jzchen@kust.edu.cn)
收录类别	SCI
WOS记录号	WOS:001159685600001
语种	英语