Halogen bonding reduces intrinsic traps and enhances charge mobilities in halide perovskite solar cells

被引:48
作者
Bi, Shiqing [1 ,3 ]
Wang, Hui [1 ]
Zhou, Jiyu [2 ]
You, Shuai [1 ]
Zhang, Yuan [2 ]
Shi, Xinghua [1 ,4 ]
Tang, Zhiyong [1 ,4 ]
Zhou, Huiqiong [1 ]
机构
[1] Natl Ctr Nanosci & Technol, CAS Ctr Excellence Nanosci, CAS Key Lab Nanosyst & Hierarch Fabricat, Beijing 100190, Peoples R China
[2] Beihang Univ, Beijing Adv Innovat Ctr Biomed Engn, Sch Chem, Beijing 100191, Peoples R China
[3] Yulin Univ, Sch Chem & Chem Engn, Yulin 719000, Shaanxi, Peoples R China
[4] Univ Chinese Acad Sci, 19A Yuquan Rd, Beijing 100049, Peoples R China
基金
中国国家自然科学基金;
关键词
EFFICIENT; PERFORMANCE; CRYSTALLIZATION; RECOMBINATION; CH3NH3PBI3; TRIHALIDE; PASSIVATION; MANAGEMENT; CHEMISTRY; FILMS;
D O I
10.1039/c8ta11835c
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
Obtaining control over the crystallographic growth kinetics in polycrystalline perovskites has become a central topic toward achieving high efficiency and stable perovskite solar cells. Inspired by the chemistry of halogen bonding, we introduce an effective processing strategy using diiodoperfluoroalkyl and diiodoalkyl additives to modulate the crystallization, traps and resultant photophysical processes in methylammonium halide (CH3NH3PbI3) perovskite solar cells that can reach a power conversion efficiency (PCE) exceeding 20% associated with a negligible hysteresis with a compact TiO2 based planar structure. Aided by combinatorial analyses with X-ray photoelectron spectroscopy, dynamic light scattering and density functional theory calculation, we ascribe the achieved modulation of the crystallization in CH3NH3PbI3 to the formation of halogen bonding between the iodine in the additives and halide anions in perovskite precursor solutions. Benefitting from the modification with additives, the resultant solar cells exhibit a decrease in Shockley-Read-Hall recombination due to the suppressed charge trapping which explains the improvement of PCE. Our solar cells processed with additives also show retardation of degradation with a considerably enhanced environmental stability. This work offers a promising route through additive management to achieve high performance and stable perovskite solar cells.
引用
收藏
页码:6840 / 6848
页数:9
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