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Negative Differential Interlayer Resistance in WSe2 Multilayers via Conducting Channel Migration with Vertical
Yeongseo Han1, Minji Chae1, Dahyun Choi1
1Department of Applied Physics, Sookmyung Women's University, Seoul 04310, Republic of Korea.
ACS Applied Materials & Interfaces
|December 5, 2023
Summary
Researchers discovered negative differential interlayer resistance (NDIR) in WSe2 multilayers. This finding explains how carrier density shifts within 2D materials under bias, impacting device design.
Area of Science:
- Condensed Matter Physics
- Materials Science
- Nanotechnology
Background:
- Interlayer resistance in 2D van der Waals (vdW) multilayers affects carrier distribution and mobility.
- The influence of interlayer resistance on carrier density profiles under varying bias remains unclear.
Purpose of the Study:
- To investigate the effect of interlayer resistance on carrier density profiles in WSe2 multilayers.
- To reveal the presence and characteristics of negative differential interlayer resistance (NDIR).
- To understand the impact of contact configurations on carrier transport.
Main Methods:
- Fabrication and characterization of WSe2 multilayers with varied contact electrode configurations (bottom, top, VDC).
- Electrical transport measurements, including four-probe measurements with vertical double-side contact (VDC).
- Analysis of transconductance characteristics to infer carrier density redistribution.
Main Results:
- Demonstrated negative differential interlayer resistance (NDIR) in WSe2 multilayers.
- Observed contact-structure-dependent modulation of transconductance, indicating carrier density redistribution.
- Identified electrically tunable NDIR and directional carrier channel migration along the thickness.
Conclusions:
- NDIR is a key factor influencing carrier transport in 2D vdW multilayers.
- Device layout significantly impacts carrier behavior and NDIR characteristics.
- Provides insights for optimizing 2D material device design and understanding carrier transport mechanisms.
Keywords:
carrier transportchannel migrationinterlayer couplingnegative differential interlayer resistancevertical double-side contactMore Related Videos
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