Interband Transitions in Monolayer and Few-Layer WSe2 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 WSe2 using photoexcited charge collection spectroscopy (PECCS). Monolayer, few-layer, and multilayer WSe2 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 WSe2 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

All Science Journal Classification (ASJC) codes

  • Materials Science(all)

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