Tuning electrical and interfacial thermal properties of bilayer MoS2via electrochemical intercalation

Feng Xiong; Eilam Yalon; Connor J McClellan; Jinsong Zhang; Burak Aslan; Aditya Sood; Jie Sun; Christopher M Andolina; Wissam A Saidi; Kenneth E Goodson; Tony F Heinz; Yi Cui; Eric Pop

doi:10.1088/1361-6528/abe78a

Tuning electrical and interfacial thermal properties of bilayer MoS₂via electrochemical intercalation

Nanotechnology. 2021 Apr 6;32(26). doi: 10.1088/1361-6528/abe78a.

Authors

Feng Xiong¹, Eilam Yalon², Connor J McClellan², Jinsong Zhang³, Burak Aslan^{3

4}, Aditya Sood³, Jie Sun³, Christopher M Andolina⁵, Wissam A Saidi⁵, Kenneth E Goodson⁶, Tony F Heinz^{4

7}, Yi Cui^{3

7}, Eric Pop^{2

3}

Affiliations

¹ Department of Electrical and Computer Engineering, University of Pittsburgh, Pittsburgh, PA 15261, United States of America.
² Department of Electrical Engineering, Stanford University, Stanford, CA 94305, United States of America.
³ Department of Materials Science and Engineering, Stanford University, Stanford, CA 94305, United States of America.
⁴ Department of Applied Physics, Stanford University, Stanford, CA 94305, United States of America.
⁵ Department of Mechanical Engineering and Materials Science, University of Pittsburgh, Pittsburgh, PA 15261, United States of America.
⁶ Department of Mechanical Engineering, Stanford University, Stanford, CA 94305, United States of America.
⁷ Stanford Institute for Materials and Energy Sciences, SLAC National Accelerator Laboratory, 2575 Sand Hill Road, Menlo Park, CA 94025, United States of America.

PMID: 33601363
DOI: 10.1088/1361-6528/abe78a

Abstract

Layered two-dimensional (2D) materials such as MoS₂have attracted much attention for nano- and opto-electronics. Recently, intercalation (e.g. of ions, atoms, or molecules) has emerged as an effective technique to modulate material properties of such layered 2D films reversibly. We probe both the electrical and thermal properties of Li-intercalated bilayer MoS₂nanosheets by combining electrical measurements and Raman spectroscopy. We demonstrate reversible modulation of carrier density over more than two orders of magnitude (from 0.8 × 10¹²to 1.5 × 10¹⁴cm^-2), and we simultaneously obtain the thermal boundary conductance between the bilayer and its supporting SiO₂substrate for an intercalated system for the first time. This thermal coupling can be reversibly modulated by nearly a factor of eight, from 14 ± 4.0 MW m^-2K^-1before intercalation to 1.8 ± 0.9 MW m^-2K^-1when the MoS₂is fully lithiated. These results reveal electrochemical intercalation as a reversible tool to modulate and control both electrical and thermal properties of 2D layers.

Keywords: Raman; electrical; intercalation; thermal; tunable; two-dimensional.