Selectively enhanced photocurrent generation in twisted bilayer graphene   with van Hove singularity

doi:10.1038/ncomms10699

CORC > 北京大学 > 化学与分子工程学院

	Selectively enhanced photocurrent generation in twisted bilayer graphene with van Hove singularity
	Yin, Jianbo ; Wang, Huan ; Peng, Han ; Tan, Zhenjun ; Liao, Lei ; Lin, Li ; Sun, Xiao ; Koh, Ai Leen ; Chen, Yulin ; Peng, Hailin ; Liu, Zhongfan
刊名	NATURE COMMUNICATIONS
	2016
关键词	CHEMICAL-VAPOR-DEPOSITION SINGLE-CRYSTAL GRAPHENE EPITAXIAL GRAPHENE PHOTODETECTOR PHOTOVOLTAGE BANDGAP GROWTH
DOI	10.1038/ncomms10699
英文摘要	Graphene with ultra-high carrier mobility and ultra-short photoresponse time has shown remarkable potential in ultrafast photodetection. However, the broad and weak optical absorption (similar to 2.3%) of monolayer graphene hinders its practical application in photodetectors with high responsivity and selectivity. Here we demonstrate that twisted bilayer graphene, a stack of two graphene monolayers with an interlayer twist angle, exhibits a strong light-matter interaction and selectively enhanced photocurrent generation. Such enhancement is attributed to the emergence of unique twist-angle-dependent van Hove singularities, which are directly revealed by spatially resolved angle-resolved photoemission spectroscopy. When the energy interval between the van Hove singularities of the conduction and valance bands matches the energy of incident photons, the photocurrent generated can be significantly enhanced (up to similar to 80 times with the integration of plasmonic structures in our devices). These results provide valuable insight for designing graphene photodetectors with enhanced sensitivity for variable wavelength.; National Basic Research Program of China [2014CB932500, 2011CB921904, 2013CB932603]; National Natural Science Foundation of China [21173004, 21222303, 51121091, 51362029]; National Program for Support of Top-Notch Young Professionals; Beijing Municipal Science and Technology Commission [Z131100003213016]; SCI(E); PubMed; ARTICLE; yulin.chen@physics.ox.ac.uk; hlpeng@pku.edu.cn; zfliu@pku.edu.cn; 10699; 7
语种	英语
内容类型	期刊论文
源URL	[http://ir.pku.edu.cn/handle/20.500.11897/434612]
专题	化学与分子工程学院
推荐引用方式 GB/T 7714	Yin, Jianbo,Wang, Huan,Peng, Han,et al. Selectively enhanced photocurrent generation in twisted bilayer graphene with van Hove singularity[J]. NATURE COMMUNICATIONS,2016.
APA	Yin, Jianbo.,Wang, Huan.,Peng, Han.,Tan, Zhenjun.,Liao, Lei.,...&Liu, Zhongfan.(2016).Selectively enhanced photocurrent generation in twisted bilayer graphene with van Hove singularity.NATURE COMMUNICATIONS.
MLA	Yin, Jianbo,et al."Selectively enhanced photocurrent generation in twisted bilayer graphene with van Hove singularity".NATURE COMMUNICATIONS (2016).