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Direct Growth of Wafer-Scale Self-Separated GaN on Reusable 2D Material Substrates
Chang-Hsun Huang1, Chia-Yi Wu1, Yi-Chia Chou1
1Department of Material Science and Engineering, National Taiwan University, Taipei, 10617, Taiwan.
Advanced Science (Weinheim, Baden-Wurttemberg, Germany)
|September 3, 2024
Summary
Researchers developed a new method for creating free-standing gallium nitride (GaN) films using hydride vapor-phase epitaxy on mica substrates. This technique simplifies GaN film separation and enables substrate reuse, yielding high-quality, single-crystalline films for device applications.
Area of Science:
- Materials Science
- Solid State Physics
- Semiconductor Technology
Background:
- Producing free-standing gallium nitride (GaN) films is crucial for advanced electronics but often faces challenges with substrate removal and low success rates.
- Existing methods for GaN substrate removal are complex and inefficient, limiting the scalability and cost-effectiveness of GaN film production.
Purpose of the Study:
- To develop a novel, high-yield method for producing wafer-scale, free-standing gallium nitride (GaN) films.
- To investigate the use of fluoro phlogopite mica as a substrate for GaN growth via hydride vapor-phase epitaxy (HVPE).
- To demonstrate the device quality of the self-separated GaN films and the reusability of the mica substrate.
Main Methods:
- Direct growth of 2-inch GaN films on fluoro phlogopite mica using hydride vapor-phase epitaxy (HVPE).
- Exploiting van der Waals (vdW) interactions between GaN and mica to mitigate lattice mismatch.
- Utilizing rapid cooling to induce vdW-driven cracks for self-separation of GaN films.
- Employing deionized water treatment for efficient GaN film lifting and mica substrate recovery.
Main Results:
- High-quality, wafer-scale, single-crystalline, and strain-free GaN films were successfully obtained via self-separation from mica.
- The vdW interaction effectively reduced lattice mismatch, enabling epitaxial growth on the 2D mica material.
- The hydrophilic nature of mica facilitated easy separation, and the substrate demonstrated reusability for multiple growth cycles.
- A functional ultraviolet light-emitting diode (UV-LED) fabricated from the self-separated GaN film confirmed its device-level quality.
Conclusions:
- A scalable and efficient method for producing free-standing GaN films using HVPE on mica substrates has been established.
- The van der Waals epitaxy approach on 2D materials offers a promising alternative substrate strategy for III-V semiconductor technology.
- This technique significantly improves the success rate of GaN film preparation and enables substrate recycling, paving the way for cost-effective GaN device manufacturing.
