Unveiling the origin of two distinct routes of interlayer charge transfer doping in Bi2Te3/MoS2/SiO2 heterostructure
- Title
- Unveiling the origin of two distinct routes of interlayer charge transfer doping in Bi2Te3/MoS2/SiO2 heterostructure
- Author
- 안지훈
- Keywords
- MoS2; Bi2Te3; Charge transfer; Raman spectroscopy; Photoluminescence; Density functional theory
- Issue Date
- 2022-03
- Publisher
- ELSEVIER
- Citation
- APPLIED SURFACE SCIENCE, v. 579, NO 152208, Page. 1-10
- Abstract
- Understanding the charge doping and thermal heating effects in atomically thin transition metal dichalcogenides
is of critical importance as the management of both is required in designing efficient low-dimensional opto-
electronics. Here, we investigate interlayer charge transfer doping and thermal heating effects in monolayer
MoS2 under the influences of not only the SiO2/Si substrate but also a topological insulator Bi2Te3 film.
Simultaneous Raman correlation and photoluminescence analyses reveal charge transfer doping and thermal
heating regimes with an increase of excitation laser power. Particularly, two distinct types of charge transfer
phenomena are observed. Photo-induced electron transfer takes place at the interface between the monolayer
MoS2 and SiO2/Si substrate. Then in the presence of Bi2Te3, besides the photo-induced electron transfer from
SiO2 to MoS2, the overall electron density in MoS2 is remarkably increased. Electronic structure calculations for
MoS2/SiO2 and Bi2Te3/MoS2/SiO2 provide direct evidence of the two types of charge transfer phenomena and
strongly support the Raman and photoluminescence results. As a result, our work demonstrates that a parallel
study of Raman scattering, photoluminescence, and relevant theory can provide valuable insights into the
interlayer charge transfer mechanism in various two-dimensional heterostructures.
- URI
- https://www.sciencedirect.com/science/article/pii/S0169433221032360https://repository.hanyang.ac.kr/handle/20.500.11754/170787
- ISSN
- 0169-4332
- DOI
- 10.1016/j.apsusc.2021.152208
- Appears in Collections:
- COLLEGE OF ENGINEERING SCIENCES[E](공학대학) > MATERIALS SCIENCE AND CHEMICAL ENGINEERING(재료화학공학과) > Articles
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