气候变化领域集成服务门户(CCPortal): Alkalis-doping of mixed tin-lead perovskites for efficient near-infrared light-emitting diodes

CCPortal

DOI	10.1016/j.scib.2021.07.021
	Alkalis-doping of mixed tin-lead perovskites for efficient near-infrared light-emitting diodes
	Yu H.; Chen W.; Fang Z.; Ding L.; Cao B.; Xiao Z.
发表日期	2021
ISSN	20959273
英文摘要	Substitution of lead (Pb) with tin (Sn) is a very important way to reduce the bandgap of metal halide perovskite for applications in solar cells, and near infrared (NIR) light-emitting diodes (LEDs), etc. However, mixed Pb/Sn perovskite becomes very disordered with high trap density when the Sn molar ratio is less than 20%. This limits the applications of mixed Pb/Sn perovskites in optoelectronic devices such as wavelength tunable NIR perovskite LEDs (PeLEDs). In this work, we demonstrate that alkali cations doping can release the microstrain and passivate the traps in mixed Pb/Sn perovskites with Sn molar ratios of less than 20%, leading to higher carrier lifetime and photoluminescence quantum yield (PLQY). The external quantum efficiency (EQE) of Sn0.2Pb0.8-based NIR PeLEDs is dramatically enhanced from 0.1% to a record value of 9.6% (emission wavelength: 868 nm). This work provides a way of making high quality mixed Pb/Sn optoelectronic devices with small Sn molar ratios. © 2021 Science China Press
关键词	Alkali cations doping Microstrain relaxation Mixed Pb/Sn perovskite NIR PeLEDs
英文关键词	Carrier lifetime; Infrared devices; Light emitting diodes; Metal halides; Molar ratio; Positive ions; Quantum efficiency; Tin; Alkali cation doping; Infrared light emitting diodes; Infrared light-emitting diodes; Microstrain relaxation; Mixed pb/sn perovskite; Molar ratio; Near Infrared; Near infrared light; Near infrared perovskite LED; Optoelectronics devices; Perovskite
语种	英语
来源期刊	Science Bulletin
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/207649
作者单位	Hefei National Laboratory for Physical Science at the Microscale, Department of Physics, Key Laboratory of Strongly-Coupled Quantum Matter Physics (CAS), University of Science and Technology of China, Hefei, 230026, China; School of Material Science and Engineering, Materials Research Center for Energy and Photoelectrochemical Conversion, University of Jinan, Jinan, 250022, China; Center for Excellence in Nanoscience (CAS), Key Laboratory of Nanosystem and Hierarchical Fabrication (CAS), National Center for Nanoscience and Technology, Beijing, 100190, China
推荐引用方式 GB/T 7714	Yu H.,Chen W.,Fang Z.,et al. Alkalis-doping of mixed tin-lead perovskites for efficient near-infrared light-emitting diodes[J],2021.
APA	Yu H.,Chen W.,Fang Z.,Ding L.,Cao B.,&Xiao Z..(2021).Alkalis-doping of mixed tin-lead perovskites for efficient near-infrared light-emitting diodes.Science Bulletin.
MLA	Yu H.,et al."Alkalis-doping of mixed tin-lead perovskites for efficient near-infrared light-emitting diodes".Science Bulletin (2021).