Ultrafast charge transfer in atomically thin MoS2/WS2 heterostructures

doi:10.1038/NNANO.2014.167

CORC > 北京大学 > 工学院

	Ultrafast charge transfer in atomically thin MoS2/WS2 heterostructures
	Hong, Xiaoping ; Kim, Jonghwan ; Shi, Su-Fei ; Zhang, Yu ; Jin, Chenhao ; Sun, Yinghui ; Tongay, Sefaattin ; Wu, Junqiao ; Zhang, Yanfeng ; Wang, Feng
刊名	nature nanotechnology
	2014
关键词	MOLYBDENUM-DISULFIDE LAYERED MATERIALS DIRAC FERMIONS MONOLAYER MOS2 SOLAR-CELLS GRAPHENE SUPERLATTICES FILMS
DOI	10.1038/NNANO.2014.167
英文摘要	Van der Waals heterostructures have recently emerged as a new class of materials, where quantum coupling between stacked atomically thin two-dimensional layers, including graphene, hexagonal-boron nitride and transition-metal dichalcogenides (MX2), give rise to fascinating new phenomena(1-10). MX2 heterostructures are particularly exciting for novel optoelectronic and photovoltaic applications, because two-dimensional MX2 monolayers can have an optical bandgap in the near-infrared to visible spectral range and exhibit extremely strong light-matter interactions(2,3,11). Theory predicts that many stacked MX2 heterostructures form type II semiconductor heterojunctions that facilitate efficient electron-hole separation for light detection and harvesting(12-16). Here, we report the first experimental observation of ultrafast charge transfer in photoexcited MoS2/WS2 heterostructures using both photoluminescence mapping and femtosecond pump-probe spectroscopy. We show that hole transfer from the MoS2 layer to the WS2 layer takes place within 50 fs after optical excitation, a remarkable rate for van der Waals coupled two-dimensional layers. Such ultrafast charge transfer in van der Waals heterostructures can enable novel two-dimensional devices for optoelectronics and light harvesting.; Nanoscience & Nanotechnology; Materials Science, Multidisciplinary; SCI(E); PubMed; 42; ARTICLE; fengwang76@berkeley.edu; 9; 682-686; 9
语种	英语
内容类型	期刊论文
源URL	[http://ir.pku.edu.cn/handle/20.500.11897/342269]
专题	工学院
推荐引用方式 GB/T 7714	Hong, Xiaoping,Kim, Jonghwan,Shi, Su-Fei,et al. Ultrafast charge transfer in atomically thin MoS2/WS2 heterostructures[J]. nature nanotechnology,2014.
APA	Hong, Xiaoping.,Kim, Jonghwan.,Shi, Su-Fei.,Zhang, Yu.,Jin, Chenhao.,...&Wang, Feng.(2014).Ultrafast charge transfer in atomically thin MoS2/WS2 heterostructures.nature nanotechnology.
MLA	Hong, Xiaoping,et al."Ultrafast charge transfer in atomically thin MoS2/WS2 heterostructures".nature nanotechnology (2014).