Electronic structure evolution and exciton energy shifting dynamics in WSe2: From monolayer to bulk

doi:10.1088/1361-6463/ac073b

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	Electronic structure evolution and exciton energy shifting dynamics in WSe2: From monolayer to bulk
	X. Chen; L. Wang; H.-Y. Wang; X.-P. Wang; Y. Luo and H.-B. Sun
刊名	Journal of Physics D: Applied Physics
	2021
卷号	54 期号:35
ISSN号	223727
DOI	10.1088/1361-6463/ac073b
英文摘要	Exciton related processes in two-dimensional (2D) transition metal dichalcogenides (TMDCs) play important roles in their optoelectronic applications. In this work, through broadband transient absorption spectroscopy, the electronic band structure evolution, exciton energy shifting dynamics and power-dependence spectral characteristics of WSe2 layers, including monolayer, bilayer, tri-layer and bulk WSe2 under 400 nm and 800 nm excitations are investigated. Particularly, under 400 nm excitation, due to the hot-exciton effect, the A-exciton energy shifting dynamics in WSe2 layers have been analysized in detail, where thicker WSe2 samples possess slower hot-exciton cooling lifetimes, and the exciton recombination approaches are affected by the band structure and interlayer interactions, in comparison with that under 800 nm excitation. The power-dependence spectral evolution in WSe2 layers suggests that the charged states like trions could be facilitated in tri-layer WSe2 (or thicker samples) at the same experimantal conditions. These findings in WSe2 layers could provide a deep insight into the hot-exciton related processes in 2D TMDCs from transient experiments ponit of view. 2021 IOP Publishing Ltd.
URL标识	查看原文
内容类型	期刊论文
源URL	[http://ir.ciomp.ac.cn/handle/181722/65213]
专题	中国科学院长春光学精密机械与物理研究所
推荐引用方式 GB/T 7714	X. Chen,L. Wang,H.-Y. Wang,et al. Electronic structure evolution and exciton energy shifting dynamics in WSe2: From monolayer to bulk[J]. Journal of Physics D: Applied Physics,2021,54(35).
APA	X. Chen,L. Wang,H.-Y. Wang,X.-P. Wang,&Y. Luo and H.-B. Sun.(2021).Electronic structure evolution and exciton energy shifting dynamics in WSe2: From monolayer to bulk.Journal of Physics D: Applied Physics,54(35).
MLA	X. Chen,et al."Electronic structure evolution and exciton energy shifting dynamics in WSe2: From monolayer to bulk".Journal of Physics D: Applied Physics 54.35(2021).