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
	2021
发表期刊	Journal of Physics D: Applied Physics
ISSN	223727
卷号	54 期号:35
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.
DOI	10.1088/1361-6463/ac073b
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收录类别	SCI ; EI
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文献类型	期刊论文
条目标识符	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).

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