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In-Plane Electrostatic Addressable Strain in MoS2 for Reconfigurable Homojunction Optoelectronics
Xinchuan Du1, Yang Wang2, Yi Cui2
1Department of Materials Science and Engineering, National University of Singapore, Singapore, Singapore.
Small Methods
|March 10, 2026
Summary
We developed a new method to precisely control strain in 2D semiconductors using electric fields, enabling tunable electronic properties for advanced optical devices.
Area of Science:
- Materials Science
- Condensed Matter Physics
- Nanotechnology
Background:
- Strain engineering is crucial for tuning electronic properties of 2D semiconductors.
- Current methods using flexible substrates or MEMS are limited in scalability and integration.
Purpose of the Study:
- To introduce a novel in-plane isolated gated architecture for electrostatic strain engineering in 2D materials.
- To demonstrate large-range, tunable, and reversible in-plane uniaxial strain in suspended monolayer MoS2.
Main Methods:
- Utilized an in-plane isolated gated architecture to create lateral electrostatic fields across suspended MoS2.
- Employed in situ photoluminescence to quantify bandgap changes and strain.
- Investigated strain-induced homojunction formation and its properties.
Main Results:
- Achieved monotonic bandgap tuning from 1.83 eV to 1.66 eV, corresponding to over 3% in-plane strain.
- Demonstrated a strain-defined homojunction with tunable rectification and photoconductive cutoff (640-785 nm).
- Showcased a single device for wavelength-division multiplexing and polarization-resolved photodetection.
Conclusions:
- Electrostatic-field-induced strain is a scalable, CMOS-compatible method for localized strain engineering in 2D materials.
- This approach enables advanced functionalities for spectral sensing, polarization detection, and optical interconnects.
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