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Title: Lithium ion intercalation in thin crystals of hexagonal TaSe 2 gated by a polymer electrolyte

Abstract

Ionic liquid gating has been used to modify the properties of layered transition metal dichalcogenides (TMDCs), including two-dimensional (2D) crystals of TMDCs used extensively recently in the device work, which has led to observations of properties not seen in the bulk. The main effect comes from the electrostatic gating due to the strong electric field at the interface. In addition, ionic liquid gating also leads to ion intercalation when the ion size of the gate electrolyte is small compared to the interlayer spacing of TMDCs. However, the microscopic processes of ion intercalation have rarely been explored in layered TMDCs. Here, we employed a technique combining photolithography device fabrication and electrical transport measurements on the thin crystals of hexagonal TaSe2 using multiple channel devices gated by a polymer electrolyte LiClO 4/Polyethylene oxide (PEO). The gate voltage and time dependent source-drain resistances of these thin crystals were used to obtain information on the intercalation process, the effect of ion intercalation, and the correlation between the ion occupation of allowed interstitial sites and the device characteristics. We found a gate voltage controlled modulation of the charge density waves and a scattering rate of charge carriers. Furthermore our work suggests that ion intercalation canmore » be a useful tool for layered materials engineering and 2D crystal device design.« less

Authors:
 [1];  [1]; ORCiD logo [1]; ORCiD logo [2];  [3]; ORCiD logo [1];  [2];  [4]
  1. Shanghai Jiao Tong Univ., Shanghai (China)
  2. Tulane Univ., New Orleans, LA (United States)
  3. Shanghai Jiao Tong Univ., Shanghai (China); Huazhong Univ. of Science and Technology, Wuhan (China)
  4. Shanghai Jiao Tong Univ., Shanghai (China); Pennsylvania State Univ., University Park, PA (United States); Collaborative Innovation Center of Advanced Microstructures, Nanjing (China)
Publication Date:
Research Org.:
Louisiana Board of Regents, Baton Rouge, LA (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1503637
Grant/Contract Number:  
SC0012432
Resource Type:
Journal Article: Accepted Manuscript
Journal Name:
Applied Physics Letters
Additional Journal Information:
Journal Volume: 112; Journal Issue: 2; Journal ID: ISSN 0003-6951
Publisher:
American Institute of Physics (AIP)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE

Citation Formats

Wu, Yueshen, Lian, Hailong, He, Jiaming, Liu, Jinyu, Wang, Shun, Xing, Hui, Mao, Zhiqiang, and Liu, Ying. Lithium ion intercalation in thin crystals of hexagonal TaSe2 gated by a polymer electrolyte. United States: N. p., 2018. Web. doi:10.1063/1.5008623.
Wu, Yueshen, Lian, Hailong, He, Jiaming, Liu, Jinyu, Wang, Shun, Xing, Hui, Mao, Zhiqiang, & Liu, Ying. Lithium ion intercalation in thin crystals of hexagonal TaSe2 gated by a polymer electrolyte. United States. doi:10.1063/1.5008623.
Wu, Yueshen, Lian, Hailong, He, Jiaming, Liu, Jinyu, Wang, Shun, Xing, Hui, Mao, Zhiqiang, and Liu, Ying. Wed . "Lithium ion intercalation in thin crystals of hexagonal TaSe2 gated by a polymer electrolyte". United States. doi:10.1063/1.5008623. https://www.osti.gov/servlets/purl/1503637.
@article{osti_1503637,
title = {Lithium ion intercalation in thin crystals of hexagonal TaSe2 gated by a polymer electrolyte},
author = {Wu, Yueshen and Lian, Hailong and He, Jiaming and Liu, Jinyu and Wang, Shun and Xing, Hui and Mao, Zhiqiang and Liu, Ying},
abstractNote = {Ionic liquid gating has been used to modify the properties of layered transition metal dichalcogenides (TMDCs), including two-dimensional (2D) crystals of TMDCs used extensively recently in the device work, which has led to observations of properties not seen in the bulk. The main effect comes from the electrostatic gating due to the strong electric field at the interface. In addition, ionic liquid gating also leads to ion intercalation when the ion size of the gate electrolyte is small compared to the interlayer spacing of TMDCs. However, the microscopic processes of ion intercalation have rarely been explored in layered TMDCs. Here, we employed a technique combining photolithography device fabrication and electrical transport measurements on the thin crystals of hexagonal TaSe2 using multiple channel devices gated by a polymer electrolyte LiClO4/Polyethylene oxide (PEO). The gate voltage and time dependent source-drain resistances of these thin crystals were used to obtain information on the intercalation process, the effect of ion intercalation, and the correlation between the ion occupation of allowed interstitial sites and the device characteristics. We found a gate voltage controlled modulation of the charge density waves and a scattering rate of charge carriers. Furthermore our work suggests that ion intercalation can be a useful tool for layered materials engineering and 2D crystal device design.},
doi = {10.1063/1.5008623},
journal = {Applied Physics Letters},
issn = {0003-6951},
number = 2,
volume = 112,
place = {United States},
year = {2018},
month = {1}
}

Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record

Citation Metrics:
Cited by: 9 works
Citation information provided by
Web of Science

Figures / Tables:

FIG. 1 FIG. 1: (a) Schematic of the multi-channel field-effect transistor device gated by a polymer electrolyte. The photoresist covers the part of the crystal. (b) Optical image of the device prepared using a 10-nm-thick 2H-TaSe2 single crystal before (upper panel) and after (lower panel) ionic gating. The photoresist window is outlinedmore » by the dashed line. (c-f) Values of R12, R23, R34, and R45 as a function of VG (see text). (g) Time dependent resistance changes of R12, R23, R34, and R45 at VG = 1.4 V.« less

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    Figures/Tables have been extracted from DOE-funded journal article accepted manuscripts.