Lithium ion intercalation in thin crystals of hexagonal TaSe2 gated by a polymer electrolyte

Yueshen Wu, Hailong Lian, Jiaming He, Jinyu Liu, Shun Wang, Hui Xing, Zhiqiang Mao, Ying Liu

Research output: Contribution to journalArticle

9 Citations (Scopus)

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 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. Our work suggests that ion intercalation can be a useful tool for layered materials engineering and 2D crystal device design.

Original languageEnglish (US)
Article number023502
JournalApplied Physics Letters
Volume112
Issue number2
DOIs
StatePublished - Jan 8 2018

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intercalation
lithium
electrolytes
polymers
transition metals
crystals
ions
electric potential
photolithography
liquids
occupation
polyethylenes
charge carriers
interlayers
interstitials
spacing
engineering
electrostatics
modulation
fabrication

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy (miscellaneous)

Cite this

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. In: Applied Physics Letters. 2018 ; Vol. 112, No. 2.
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Lithium ion intercalation in thin crystals of hexagonal TaSe2 gated by a polymer electrolyte. / Wu, Yueshen; Lian, Hailong; He, Jiaming; Liu, Jinyu; Wang, Shun; Xing, Hui; Mao, Zhiqiang; Liu, Ying.

In: Applied Physics Letters, Vol. 112, No. 2, 023502, 08.01.2018.

Research output: Contribution to journalArticle

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