Journal article Optical grade transformation of monolayer transition metal dichalcogenides via encapsulation annealing
Huije Ryu (author) (Search by this author)
;
Seong Chul Hong (author) (Search by this author)
;
Kangwon Kim (author) (Search by this author)
;
Yeonjoon Jung (author) (Search by this author)
;
Yangjin Lee (author) (Search by this author)
;
Kihyun Lee (author) (Search by this author)
;
Youngbum Kim (author) (Search by this author)
;
Hyunjun Kim (author) (Search by this author)
;
Kenji Watanabe (author) (Search by this author)
ORCID https://orcid.org/0000-0003-3701-8119
National Institute for Materials Science
SAMURAI NIMS Researchers Directory SAMURAI
ORCID SAMURAI ;
Takashi Taniguchi (author) (Search by this author)
ORCID https://orcid.org/0000-0002-1467-3105
National Institute for Materials Science
SAMURAI NIMS Researchers Directory SAMURAI
ORCID SAMURAI ;
Jeongyong Kim (author) (Search by this author)
;
Kwanpyo Kim (author) (Search by this author)
;
Hyeonsik Cheong (author) (Search by this author)
;
Gwan-Hyoung Lee (author) (Search by this author)
d3nr06641j.pdf
Download file (2.24 MB)
Download as zip (1.91 MB)
Collection

Citation
Huije Ryu, Seong Chul Hong, Kangwon Kim, Yeonjoon Jung, Yangjin Lee, Kihyun Lee, Youngbum Kim, Hyunjun Kim, Kenji Watanabe, Takashi Taniguchi, Jeongyong Kim, Kwanpyo Kim, Hyeonsik Cheong, Gwan-Hyoung Lee. Optical grade transformation of monolayer transition metal dichalcogenides via encapsulation annealing. Nanoscale. 2024, 16 (11), 5836-5844. https://doi.org/10.1039/d3nr06641j
SAMURAI

Description:

(abstract)

Monolayer transition metal dichalcogenides (TMDs) have emerged as highly promising candidates for optoelectronic applications due to their direct band gap and strong light-matter interactions. However, exfoliated TMDs have demonstrated optical characteristics that fall short of expectations, primarily because of significant defects and associated doping in the synthesized TMD crystals. Here, we report improvement of optical properties in monolayer TMDs of MoS2, MoSe2, WS2, and WSe2, by hBN-encapsulation annealing. Monolayer WSe2 showed 2,000 % enhancement of photoluminescence quantum yield (PLQY) and 1,000 % increase of prolonged lifetime after encapsulation annealing at 1000°C, which are attributed to dominant radiative recombination of excitons through dedoping of exfoliated monolayer TMDs. Furthermore, after encapsulation annealing, the transport characteristics of monolayer WS2 ¬changed from n-type to ambipolar, along with an enhanced hole transport, which also support dedoping of annealed TMDs. This work provides an innovative approach to elevate the optical grade of monolayer TMDs, enabling the fabrication of high-performance optoelectronic devices.

Rights:

Keyword: Monolayer TMDs, optical properties, hBN-encapsulation

Date published: 2024-02-26

Publisher: Royal Society of Chemistry (RSC)

Journal:

  • Nanoscale (ISSN: 20403372) vol. 16 issue. 11 p. 5836-5844

Funding:

  • National Research Foundation of Korea NRF-2021R1A2C301431613
  • National Research Foundation of Korea NRF-2019R1A2C3006189
  • National Research Foundation of Korea NRF-2017R1A5A1014862
  • Seoul National University
  • Japan Society for the Promotion of Science 23H02052
  • Ministry of Education, Culture, Sports, Science and Technology
  • Ministry of Science and ICT 2017R1A5A1014862
  • Ministry of Science and ICT 2019R1A2C3006189
  • Ministry of Science and ICT 2021R1A2C301431613
  • Japan Society for the Promotion of Science 21H05233

Manuscript type: Publisher's version (Version of record)

MDR DOI:

First published URL: https://doi.org/10.1039/d3nr06641j

Related item:

Other identifier(s):

Contact agent:

Updated at: 2025-02-15 12:30:34 +0900

Published on MDR: 2025-02-15 12:30:34 +0900

Filename Size
Filename d3nr06641j.pdf (Thumbnail)
application/pdf 		Size 2.24 MB Detail