Ultrafast interfacial energy transfer and interlayer excitons in the monolayer WS2/CsPbBr3 quantum dot heterostructure

doi:10.1039/c7nr05542k

CORC > 化学研究所 > 中国科学院化学研究所

	Ultrafast interfacial energy transfer and interlayer excitons in the monolayer WS2/CsPbBr3 quantum dot heterostructure
	Li, Han 1; Zheng, Xin 2,3; Liu, Yu 1; Zhang, Zhepeng 4; Jiang, Tian 1,2
刊名	NANOSCALE
	2018-01-28
卷号	10 期号:4 页码:1650-1659
ISSN号	2040-3364
DOI	10.1039/c7nr05542k
英文摘要	The idea of fabricating artificial solids with band structures tailored to particular applications has long fascinated condensed matter physicists. Heterostructure (HS) construction is viewed as an effective and appealing approach to engineer novel electronic properties in two dimensional (2D) materials. Different from common 2D/2D heterojunctions where energy transfer is rarely observed, CsPbBr3 quantum dots (0D-QDs) interfaced with 2D materials have become attractive HSs for exploring the physics of charge transfer and energy transfer, due to their superior optical properties. In this paper, a new 0D/2D HS is proposed and experimentally studied, making it possible to investigate both light utilization and energy transfer. Specifically, this HS is constructed between monolayer WS2 and CsPbBr3 QDs, and exhibits a hybrid band alignment. The dynamics of energy transfer within the investigated 0D/2D HS is characterized by femtosecond transient absorption spectrum (TAS) measurements. The TAS results reveal that ultrafast energy transfer caused by optical excitation is observed from CsPbBr3 QDs to the WS2 layer, which can increase the exciton fluence within the WS2 layer up to 69% when compared with pristine ML WS2 under the same excitation fluence. Moreover, the formation and dynamics of interlayer excitons have also been investigated and confirmed in the HS, with a calculated recombination time of 36.6 ps. Finally, the overall phenomenological dynamical scenario for the 0D/2D HS is established within the 100 ps time region after excitation. The techniques introduced in this work can also be applied to versatile optoelectronic devices based on low dimensional materials.
语种	英语
出版者	ROYAL SOC CHEMISTRY
WOS记录号	WOS:000423355300012
内容类型	期刊论文
源URL	[http://ir.iccas.ac.cn/handle/121111/45551]
专题	中国科学院化学研究所
通讯作者	Jiang, Tian
作者单位	1.Natl Univ Def Technol, Coll Optoelect Sci & Engn, Changsha 410073, Hunan, Peoples R China 2.Natl Univ Def Technol, Interdisciplinary Ctr Quantum Informat, Changsha 410073, Hunan, Peoples R China 3.Natl Univ Def Technol, State Key Lab High Performance Comp, Changsha 410073, Hunan, Peoples R China 4.Peking Univ, Beijing Sci & Engn Ctr Nanocarbons, Beijing Natl Lab Mol Sci,Coll Chem & Mol Engn, Acad Adv Interdisciplinary Studies,Ctr Nanochem C, Beijing 100871, Peoples R China
推荐引用方式 GB/T 7714	Li, Han,Zheng, Xin,Liu, Yu,et al. Ultrafast interfacial energy transfer and interlayer excitons in the monolayer WS2/CsPbBr3 quantum dot heterostructure[J]. NANOSCALE,2018,10(4):1650-1659.
APA	Li, Han,Zheng, Xin,Liu, Yu,Zhang, Zhepeng,&Jiang, Tian.(2018).Ultrafast interfacial energy transfer and interlayer excitons in the monolayer WS2/CsPbBr3 quantum dot heterostructure.NANOSCALE,10(4),1650-1659.
MLA	Li, Han,et al."Ultrafast interfacial energy transfer and interlayer excitons in the monolayer WS2/CsPbBr3 quantum dot heterostructure".NANOSCALE 10.4(2018):1650-1659.