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説明:

Monolayer transition metal dichalcogenides (TMDs) have received great attention due to their fascinating physical properties and their potential for applications in novel semiconductor devices. However, the intrinsic physical properties of TMDs can be significantly altered by extrinsic disorders such as surface roughness and charge disorder induced by substrates. The encapsulation of TMDs using hexagonal boron nitride layers has been proposed as a practical way to reduce substrate-induced disorders. Despite experimental advances, the exact role of hexagonal boron nitride encapsulation remains unclear in terms of defect physics in TMDs. Here, we found that h-BN encapsulation effectively passivates the defects of monolayer WS2 by anchoring the adsorbed oxygen atoms onto monolayer WS2 crystals. Due to defect passivation by h-BN encapsulation, the excess electron density in monolayer WS2 crystals is greatly lowered and stabilized, resulting in two orders of magnitude lower exciton annihilation by trion conversion and Auger recombination processes. Furthermore, the valley polarization becomes robust against the various excitation and ambient conditions in the h-BN encapsulated WS2 crystals. Our findings provide insight into the role of h-BN encapsulation and the related excitonic properties of 2D semiconductors.

権利情報:

• Creative Commons BY Attribution 4.0 International
  

キーワード: Hexagonal boron nitride, defect-related gap states, WS2 crystals

刊行年月日: 2024-03-17

出版者: Wiley

掲載誌:

• Advanced Science (ISSN: 21983844) vol. 11 issue. 22 2310197

研究助成金:

• National Research Foundation of Korea 2019R1A2C1088525
• National Research Foundation of Korea RS‐2023‐00236798
• National Research Foundation of Korea 2020R1C1C1006914
• Japan Society for the Promotion of Science 19H05790
• Japan Society for the Promotion of Science 20H00354
• Japan Society for the Promotion of Science 21H05233
• Ministry of Trade, Industry and Energy 20010542

原稿種別: 出版者版 (Version of record)

MDR DOI:

公開URL: https://doi.org/10.1002/advs.202310197

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更新時刻: 2025-02-14 12:32:08 +0900

MDRでの公開時刻: 2025-02-14 12:32:08 +0900