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Interband Transitions in Monolayer and Few-Layer WSe2 Probed Using Photoexcited Charge Collection Spectroscopy

  • Kyunghee Choi
    Kyunghee Choi
    Reality Display Device Research Group, Electronics and Telecommunications Research Institute, 218 Gajeong-ro, Yuseong-gu, Daejeon 34129, Republic of Korea
  • Kimoon Lee
    Kimoon Lee
    Department of Physics, Kunsan National University, Gunsan 54150, Republic of Korea
    More by Kimoon Lee
  • Sanghyuck Yu
    Sanghyuck Yu
    Department of Physics, Yonsei University, 50 Yonsei-ro, Seodaemun-gu, Seoul 03722, Republic of Korea
    More by Sanghyuck Yu
  • Sehoon Oh
    Sehoon Oh
    Department of Physics, Yonsei University, 50 Yonsei-ro, Seodaemun-gu, Seoul 03722, Republic of Korea
    More by Sehoon Oh
  • Hyoung Joon Choi
    Hyoung Joon Choi
    Department of Physics, Yonsei University, 50 Yonsei-ro, Seodaemun-gu, Seoul 03722, Republic of Korea
  • Heesun Bae*
    Heesun Bae
    Department of Physics, Yonsei University, 50 Yonsei-ro, Seodaemun-gu, Seoul 03722, Republic of Korea
    *E-mail: [email protected] (H.B.).
    More by Heesun Bae
  • , and 
  • Seongil Im*
    Seongil Im
    Department of Physics, Yonsei University, 50 Yonsei-ro, Seodaemun-gu, Seoul 03722, Republic of Korea
    *E-mail: [email protected] (S.I.). Phone: 82-2-2123-2842. Fax: 82-2-392-1592. Address: Van der Waals Materials Research Center, Department of Physics, Yonsei University, Seoul 03722, Korea.
    More by Seongil Im
Cite this: ACS Appl. Mater. Interfaces 2018, 10, 24, 20213–20218
Publication Date (Web):June 8, 2018
https://doi.org/10.1021/acsami.8b04056
Copyright © 2018 American Chemical Society
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Supporting Info (1)»

Abstract

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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 Γ–K and Γ–Λ transitions as well as the direct K–K transition are clearly resolved in multilayer WSe2 by PECCS.

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The Supporting Information is available free of charge on the ACS Publications website at DOI: 10.1021/acsami.8b04056.

  • OM images and photoinduced transfer characteristics of the 1L and 4L WSe2 FETs for PECCS measurement and AFM image and thickness profile of the 4L WSe2 flake (PDF)

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Most electronic Supporting Information files are available without a subscription to ACS Web Editions. Such files may be downloaded by article for research use (if there is a public use license linked to the relevant article, that license may permit other uses). Permission may be obtained from ACS for other uses through requests via the RightsLink permission system: http://pubs.acs.org/page/copyright/permissions.html.

Cited By

This article is cited by 7 publications.

  1. Jung Hyun Ryu, Jeong‐Gyu Kim, Bongjae Kim, Kyoo Kim, Sooran Kim, Jae‐Hoon Park, Byeong‐Gyu Park, Younghak Kim, Kyung‐Tae Ko, Kimoon Lee. Direct Observation of Orbital Driven Strong Interlayer Coupling in Puckered Two‐Dimensional PdSe 2. Small 2022, 18 (9) , 2106053. https://doi.org/10.1002/smll.202106053
  2. Wonjun Choi, Jongtae Ahn, Ki‐Tae Kim, Hye‐Jin Jin, Sungjae Hong, Do Kyung Hwang, Seongil Im. Ambipolar Channel p‐TMD/n‐Ga 2 O 3 Junction Field Effect Transistors and High Speed Photo‐sensing in TMD Channel. Advanced Materials 2021, 33 (38) , 2103079. https://doi.org/10.1002/adma.202103079
  3. Xiaotong Wang, Wenpei Kang, Yuyu Wang, Bingchen Zhang, Daofeng Sun. Tailored template engineering of MoSe 2 /N,P-doped carbon nanospheres with sandwiched carbon and few-layered MoSe 2 shells for stable and high-rate storage of Na + /K + -ions. Journal of Materials Chemistry A 2021, 9 (33) , 17780-17789. https://doi.org/10.1039/D1TA05655G
  4. W. X. Zhang, Y. Yin, C. He. Lowering the Schottky barrier height of G/WSSe van der Waals heterostructures by changing the interlayer coupling and applying external biaxial strain. Physical Chemistry Chemical Physics 2020, 22 (45) , 26231-26240. https://doi.org/10.1039/D0CP04474A
  5. Xu Guo, Penghui Guo, Chenxu Wang, Yubin Chen, Liejin Guo. Few-layer WSe2 nanosheets as an efficient cocatalyst for improved photocatalytic hydrogen evolution over Zn0.1Cd0.9S nanorods. Chemical Engineering Journal 2020, 383 , 123183. https://doi.org/10.1016/j.cej.2019.123183
  6. Yeonsu Jeong, Dongguen Shin, Ji Hoon Park, Jeehong Park, Yeonjin Yi, Seongil Im. Integrated advantages from perovskite photovoltaic cell and 2D MoTe2 transistor towards self-power energy harvesting and photosensing. Nano Energy 2019, 63 , 103833. https://doi.org/10.1016/j.nanoen.2019.06.029
  7. Qingliang Feng, Meijie Zhu, Yaohua Zhao, Hongyan Liu, Meng Li, Jianbang Zheng, Hua Xu, Yimin Jiang. Chemical vapor deposition growth of sub-centimeter single crystal WSe 2 monolayer by NaCl-assistant. Nanotechnology 2019, 30 (3) , 034001. https://doi.org/10.1088/1361-6528/aaea24

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