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Related Experiment Video

Updated: Jun 25, 2026

Scalable Solution-processed Fabrication Strategy for High-performance, Flexible, Transparent Electrodes with Embedded Metal Mesh

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Published on: June 23, 2017

Dual-Functional Metal Interlayer Enables High-Quality GaN Epitaxy and Low-Damage Transfer Towards Flexible

Yaqing Ma¹, Yuqiao Zheng^2,3, Huaze Zhu⁴

¹Zhejiang University, Hangzhou, China.

|June 24, 2026

Summary

A novel metal-interlayer chemical lift-off (MI-CLO) strategy enables high-quality gallium nitride (GaN) epitaxy and intact transfer for flexible optoelectronics. This method uses a dual-functional metal interlayer for growth and exfoliation, overcoming previous limitations.

Keywords:

epitaxy flexible applications gallium nitride low‐damage transfer metal interlayer

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Area of Science:

Materials Science
Semiconductor Physics
Optoelectronics

Background:

High-quality gallium nitride (GaN) epitaxy and transfer are critical for flexible optoelectronics.
Existing methods face challenges due to the trade-off between strong interfaces for epitaxy and weak forces for exfoliation.

Purpose of the Study:

To develop a novel strategy for achieving high-quality GaN epitaxy and intact transfer to flexible substrates.
To overcome the limitations of current epitaxy and transfer techniques.

Main Methods:

A dual-functional metal-interlayer chemical lift-off (MI-CLO) strategy was employed.
A metallic interlayer served as both an epitaxial template and a dissolvable sacrificial layer.
Copper (Cu) was investigated as the metal interlayer, showing superior performance over nickel.

Main Results:

The MI-CLO strategy facilitated single-crystalline GaN thin film growth and low-damage transfer.
A 33-µm GaN film on sapphire exhibited a low (0002) rocking curve FWHM of 0.10°.
A 5-µm GaN film showed a low threading dislocation density (8 × 10⁸ cm⁻²).
The technology demonstrated broad applicability across heteroepitaxial systems and enabled strain-released transfer to flexible substrates.

Conclusions:

The MI-CLO strategy successfully enables high-quality GaN epitaxy and intact transfer for flexible optoelectronics.
A flexible ultraviolet photodetector was fabricated, demonstrating stable performance under bending.
This technology holds significant potential for advanced flexible optoelectronic devices.