Interband Transitions in Monolayer and Few-Layer WSe 2 Probed Using Photoexcited Charge Collection Spectroscopy

Kyunghee Choi, Kimoon Lee, Sanghyuck Yu, Sehoon Oh, Hyoung Joon Choi, Heesun Bae, Seongil Im

Research output: Contribution to journalArticle

3 Citations (Scopus)

Abstract

Transition-metal dichalcogenides are currently under rigorous investigation because of their distinct layer-dependent physical properties originating from the corresponding evolution of the band structure. Here, we report the highly resolved probing of layer-dependent band structure evolution for WSe 2 using photoexcited charge collection spectroscopy (PECCS). Monolayer, few-layer, and multilayer WSe 2 can be probed in top-gate field-effect transistor platforms, and their interband transitions are efficiently observed. Our theoretical calculations show a great coincidence with the PECCS results, proving that the indirect ⌈-K and ⌈-λ transitions as well as the direct K-K transition are clearly resolved in multilayer WSe 2 by PECCS.

Original languageEnglish
Pages (from-to)20213-20218
Number of pages6
JournalACS Applied Materials and Interfaces
Volume10
Issue number24
DOIs
Publication statusPublished - 2018 Jun 20

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Monolayers
Spectroscopy
Band structure
Multilayers
Gates (transistor)
Transition metals
Physical properties

All Science Journal Classification (ASJC) codes

  • Materials Science(all)

Cite this

Choi, Kyunghee ; Lee, Kimoon ; Yu, Sanghyuck ; Oh, Sehoon ; Choi, Hyoung Joon ; Bae, Heesun ; Im, Seongil. / Interband Transitions in Monolayer and Few-Layer WSe 2 Probed Using Photoexcited Charge Collection Spectroscopy In: ACS Applied Materials and Interfaces. 2018 ; Vol. 10, No. 24. pp. 20213-20218.
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Interband Transitions in Monolayer and Few-Layer WSe 2 Probed Using Photoexcited Charge Collection Spectroscopy . / Choi, Kyunghee; Lee, Kimoon; Yu, Sanghyuck; Oh, Sehoon; Choi, Hyoung Joon; Bae, Heesun; Im, Seongil.

In: ACS Applied Materials and Interfaces, Vol. 10, No. 24, 20.06.2018, p. 20213-20218.

Research output: Contribution to journalArticle

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