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Published on: December 4, 2014
GaN epitaxial layers prepared on nano-patterned Si(001) substrate
C C Huang1, S J Chang, C H Kuo
1Institute of Microelectronics and Department of Electrical Engineering, Center for Micro/Nano Science and Technology, National Cheng Kung University, Tainan 701, Taiwan
Journal of Nanoscience and Nanotechnology
|April 2, 2011
Summary
We grew gallium nitride (GaN) epitaxial layers on nano-patterned silicon substrates, significantly reducing threading dislocations and tensile stress. This advancement offers improved GaN material quality for electronic applications.
Area of Science:
- Materials Science
- Semiconductor Physics
- Nanotechnology
Background:
- Gallium nitride (GaN) is a critical material for high-power and high-frequency electronic devices.
- Growing high-quality GaN on silicon (Si) substrates is challenging due to lattice mismatch and thermal expansion differences.
- Existing methods often result in high defect densities and significant stress in GaN layers.
Purpose of the Study:
- To investigate the growth of GaN epitaxial layers on nano-patterned Si(001) substrates.
- To analyze the structural properties, phase composition, and stress of the resulting GaN layers.
- To evaluate the effectiveness of nano-patterning in improving GaN epitaxy on Si.
Main Methods:
- Fabrication of nano-patterned Si(001) substrates using dry etching techniques common in the integrated circuit (IC) industry.
- Growth of GaN epitaxial layers on both nano-patterned and conventional unpatterned Si substrates.
- Characterization of GaN epitaxial layers using techniques to assess phase, threading dislocation density, and residual stress.
Main Results:
- GaN epitaxial layers grown on nano-patterned Si(001) substrates exhibited both cubic and hexagonal phases.
- A significant reduction in threading dislocation density was observed compared to GaN grown on unpatterned Si(111) substrates.
- Tensile stress in the GaN epitaxial layer was reduced by approximately 78% when using the nano-patterned Si(001) substrate.
Conclusions:
- Nano-patterning of Si(001) substrates is an effective strategy for improving GaN epitaxy.
- This method leads to reduced defectivity and lower tensile stress in GaN layers.
- The findings suggest a viable pathway for high-quality GaN-on-Si integration for advanced electronic devices.
