Exciton Transitions in Monolayer WS2 Activated by Swift Heavy Ion Irradiation

doi:10.1021/acs.jpcc.1c04724

	Exciton Transitions in Monolayer WS2 Activated by Swift Heavy Ion Irradiation
	Zhang, Shengxia 3; Hu, Peipei 3; Xu, Lijun 3; Chen, Hailong 1; Maaz, Khan 3; Zhai, Pengfei 3; Li, Zongzhen 3; Liu, Li 2,3; Ai, Wensi 2,3; Zeng, Jian 3
刊名	JOURNAL OF PHYSICAL CHEMISTRY C
	2021-09-23
卷号	125 期号:37 页码:20389-20396
ISSN号	1932-7447
DOI	10.1021/acs.jpcc.1c04724
通讯作者	Zeng, Jian(zengjian@impcas.ac.cn) ; Liu, Jie(j.liu@impcas.ac.cn)
英文摘要	The emergence of monolayer transition metal dichalcogenides (TMDCs) has provided a favorable platform for exploring a broad range of novel optoelectronic device applications and quantum phenomena due to their remarkable physical and chemical characteristics. Understanding the transition and motion of excitons in TMDCs is of fundamental interest for their optoelectronic devices. Here, we demonstrate the exciton transition in monolayer WS2 that can be fine-tuned by swift heavy ion (SHI) irradiation. The dependence of trion and exciton emissions on SHI irradiation in the as-transferred and as-grown monolayer WS2 was investigated by micro photoluminescence (PL) spectra where different PL responses were monitored. The trion-to-exciton transition in the as-transferred WS2 monolayer was ascribed to SHI irradiation that resulted in charge localization and pre-existing defect annealing, whereas the exciton-to-trion transition in the as-grown WS2 monolayer was attributed to the competition of charge localization and charge transfer caused by SHI irradiation. Femtosecond transient absorption measurements were performed to study the exciton relaxation dynamics in SHIirradiated WS2, and it was shown that defect-assisted recombination dominates the exciton relaxation process for SHI-irradiated WS2. These results open up new opportunities to manipulate and tune the optical properties of two-dimensional TMDCs, which are of special importance for the development of optoelectronic and valleytronic devices.
资助项目	National Natural Science Foundation of China[12035019] ; National Natural Science Foundation of China[11675233] ; National Natural Science Foundation of China[11690041] ; Institute of Modern Physics, Chinese Academy of Sciences (CAS) ; CAS Light of West China Program
WOS关键词	POSITIVELY CHARGED EXCITONS ; MONO LAYER ; NEUTRAL EXCITONS ; FINE-STRUCTURE ; ELECTRON-GAS ; DYNAMICS ; PHOTOLUMINESCENCE ; STATES ; TRACK ; SPECTROSCOPY
WOS研究方向	Chemistry ; Science & Technology - Other Topics ; Materials Science
语种	英语
出版者	AMER CHEMICAL SOC
WOS记录号	WOS:000702017100024
资助机构	National Natural Science Foundation of China ; Institute of Modern Physics, Chinese Academy of Sciences (CAS) ; CAS Light of West China Program
内容类型	期刊论文
源URL	[http://119.78.100.186/handle/113462/136304]
专题	中国科学院近代物理研究所
通讯作者	Zeng, Jian; Liu, Jie
作者单位	1.Chinese Acad Sci, Inst Phys, Beijing Natl Lab Condensed Matter Phys, CAS Key Lab Soft Matter Phys, Beijing 100190, Peoples R China 2.Univ Chinese Acad Sci, Beijing 100049, Peoples R China 3.Chinese Acad Sci, Inst Modern Phys, Lanzhou 730000, Peoples R China
推荐引用方式 GB/T 7714	Zhang, Shengxia,Hu, Peipei,Xu, Lijun,et al. Exciton Transitions in Monolayer WS2 Activated by Swift Heavy Ion Irradiation[J]. JOURNAL OF PHYSICAL CHEMISTRY C,2021,125(37):20389-20396.
APA	Zhang, Shengxia.,Hu, Peipei.,Xu, Lijun.,Chen, Hailong.,Maaz, Khan.,...&Liu, Jie.(2021).Exciton Transitions in Monolayer WS2 Activated by Swift Heavy Ion Irradiation.JOURNAL OF PHYSICAL CHEMISTRY C,125(37),20389-20396.
MLA	Zhang, Shengxia,et al."Exciton Transitions in Monolayer WS2 Activated by Swift Heavy Ion Irradiation".JOURNAL OF PHYSICAL CHEMISTRY C 125.37(2021):20389-20396.