Ionic liquid gating induced self-intercalation of transition metal chalcogenides

Fei Wang, Yang Zhang, Zhijie Wang, Haoxiong Zhang, Xi Wu, Changhua Bao, Jia Li (), Pu Yu () and Shuyun Zhou ()
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Fei Wang: Tsinghua University
Yang Zhang: Tsinghua University
Zhijie Wang: Tsinghua University
Haoxiong Zhang: Tsinghua University
Xi Wu: Tsinghua University
Changhua Bao: Tsinghua University
Jia Li: Tsinghua University
Pu Yu: Tsinghua University
Shuyun Zhou: Tsinghua University

Nature Communications, 2023, vol. 14, issue 1, 1-8

Abstract: Abstract Ionic liquids provide versatile pathways for controlling the structures and properties of quantum materials. Previous studies have reported electrostatic gating of nanometer-thick flakes leading to emergent superconductivity, insertion or extraction of protons and oxygen ions in perovskite oxide films enabling the control of different phases and material properties, and intercalation of large-sized organic cations into layered crystals giving access to tailored superconductivity. Here, we report an ionic-liquid gating method to form three-dimensional transition metal monochalcogenides (TMMCs) by driving the metals dissolved from layered transition metal dichalcogenides (TMDCs) into the van der Waals gap. We demonstrate the successful self-intercalation of PdTe2 and NiTe2, turning them into high-quality PdTe and NiTe single crystals, respectively. Moreover, the monochalcogenides exhibit distinctive properties from dichalcogenides. For instance, the self-intercalation of PdTe2 leads to the emergence of superconductivity in PdTe. Our work provides a synthesis pathway for TMMCs by means of ionic liquid gating driven self-intercalation.

Date: 2023
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DOI: 10.1038/s41467-023-40591-5

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