ReS₂ on GaN Photodetector Using H⁺ Ion-Cut Technology.

Area of Science:

• Materials Science
• Optoelectronics
• Semiconductor Physics

Background:

• Gallium Nitride (GaN) is a wide bandgap semiconductor with unique polarization properties.
• Rhenium Disulfide (ReS₂) is a promising 2D material for optoelectronic applications.
• Developing high-performance photodetectors is crucial for advanced optical sensing.

Purpose of the Study:

• To fabricate and compare ReS₂ photodetectors on GaN and sapphire substrates.
• To investigate the impact of GaN's polarization effect on ReS₂ photodetector performance.
• To demonstrate an enhanced method for improving ReS₂ photodetector characteristics.

Main Methods:

• Wafer-scale single-crystal GaN film transfer using ion-cut and surface-activated bonding.
• Growth of uniform, large-scale ReS₂ multilayers on GaN substrates.
• Fabrication and performance characterization of ReS₂ photodetectors on GaN and sapphire.

Main Results:

• ReS₂ photodetectors fabricated on GaN substrates showed significantly superior performance compared to those on sapphire.
• The ReS₂/GaN photodetector achieved a high responsivity of 40.12 A/W, versus 0.17 A/W for ReS₂/sapphire.
• Key performance metrics for ReS₂/GaN included a photoconductive gain of 447.30, NEP of 1.80 × 10⁻¹⁴ W/Hz¹/², and detectivity of 1.21 × 10¹⁰ Jones.

Conclusions:

• The polarization effect of GaN enhances the performance of ReS₂ photodetectors.
• This study presents a novel approach to significantly boost the performance of ReS₂-based photodetectors.
• The findings open new avenues for developing next-generation optoelectronic devices utilizing 2D materials on GaN.