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説明:

Optically dark excitons determine a wide range of properties of photoexcited semiconductors yet are hard to access via conventional time-resolved spectroscopies. Here, we develop a time- resolved ultrafast photocurrent technique (trPC) to probe the formation dynamics of optically dark excitons. The nonlinear nature of the trPC makes it particularly sensitive to the formation of excitons occurring at the femtosecond timescale after the excitation. As proof of principle, we extract the interlayer exciton formation time 0.4 ps at 160 μJ/cm2 fluence in a MoS2/MoSe2 heterostructure and show that this time decreases with fluence. In addition, our approach provides access to the dynamics of carriers and their interlayer transport. Overall, our work establishes trPC as a technique to study dark excitons in various systems that are hard to probe by other approaches.

権利情報:

• Creative Commons BY Attribution 4.0 International
  

キーワード: Dark excitons, ultrafast photocurrent, MoS2/MoSe2

刊行年月日: 2023-10-25

出版者: American Chemical Society (ACS)

掲載誌:

• Nano Letters (ISSN: 15306984) vol. 23 issue. 20 p. 9212-9218

研究助成金:

• Bundesministerium für Bildung und Forschung 05K22KE3
• Deutsche Forschungsgemeinschaft TRR227 B08

原稿種別: 出版者版 (Version of record)

MDR DOI:

公開URL: https://doi.org/10.1021/acs.nanolett.3c01708

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更新時刻: 2025-02-14 16:31:00 +0900

MDRでの公開時刻: 2025-02-14 16:31:00 +0900