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Updated: Feb 7, 2026
12:26
Fabrication, Operation and Flow Visualization in Surface-acoustic-wave-driven Acoustic-counterflow Microfluidics
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Acoustic-Driven Enhancement of Photocarrier Separation in a Reconfigurable WSe2 Homojunction
Xuan Deng1, Chao Dou1, Yan Wang1
1State Key Laboratory of Precision Measuring Technology and Instruments, School of Precision Instruments and Optoelectronics Engineering, Tianjin University, Tianjin City 300072, China.
ACS Applied Materials & Interfaces
|February 5, 2026
Summary
Surface acoustic waves (SAWs) enhance photocarrier separation in two-dimensional transition-metal dichalcogenide (TMD) homojunctions. This acoustooptic approach boosts photocurrent and improves optoelectronic device performance.
Area of Science:
- Materials Science
- Condensed Matter Physics
- Optoelectronics
Background:
- Two-dimensional transition-metal dichalcogenide (TMD) homojunctions show promise for optoelectronics.
- Inefficient carrier separation limits their performance, even under reverse bias.
Purpose of the Study:
- To investigate surface acoustic wave (SAW) technology for enhancing photocarrier dissociation in TMD homojunctions.
- To demonstrate a scalable acoustooptic platform for nonpiezoelectric low-dimensional systems.
Main Methods:
- Fabrication of a reconfigurable WSe2 homojunction on a hexagonal boron nitride (h-BN) layer.
- Integration with a LiNbO3 substrate and interdigitated transducers for SAW generation.
- Dynamic tuning of built-in potentials via UV-assisted doping.
Main Results:
- SAW excitation enhanced photocurrent by 30% at 550 nm illumination.
- Achieved >10^3 rectification ratio with negligible dark-current variation.
- Observed a 30% photocurrent enhancement at significantly lower voltage compared to reverse bias.
Conclusions:
- SAW technology effectively enhances photocarrier separation through strain-mediated electron-phonon interactions.
- SAW induces type-I band modulation, creating energy barriers that suppress recombination.
- This work presents SAW as a viable strategy for improving optoelectronic performance in homojunctions.
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