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Updated: Jul 23, 2026

Fabrication of Uniform Nanoscale Cavities via Silicon Direct Wafer Bonding

Fabrication of Uniform Nanoscale Cavities via Silicon Direct Wafer Bonding

Published on: January 9, 2014

AlGaN HEMT Structures Grown on Miscut Si(111) Wafers.

Alexei V Sakharov^1,2, Dmitri S Arteev², Evgenii E Zavarin^1,2

¹Submicron Heterostructures for Microelectronics, Research and Engineering Center, RAS, 26 Politekhnicheskaya, 194021 Saint-Petersburg, Russia.

Materials (Basel, Switzerland)

|June 28, 2023

Summary

Substrate miscut significantly impacts AlGaN/GaN transistor properties. Optimizing wafer misorientation enhances 2D electron gas mobility, with interface roughness being a key factor.

Keywords:

AlGaN HEMT MOVPE Si carrier mobility miscut

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Last Updated: Jul 23, 2026

Fabrication of Uniform Nanoscale Cavities via Silicon Direct Wafer Bonding

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Published on: January 9, 2014

Atomically Traceable Nanostructure Fabrication

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Published on: July 17, 2015

Fabricating van der Waals Heterostructures with Precise Rotational Alignment

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Published on: July 5, 2019

Area of Science:

Materials Science
Semiconductor Physics
Device Engineering

Background:

Aluminum Gallium Nitride/Gallium Nitride (AlGaN/GaN) high-electron-mobility transistors (HEMTs) are crucial for high-power and high-frequency applications.
Substrate properties, particularly miscut orientation, can influence epitaxial growth and device performance.
Understanding these influences is vital for optimizing HEMT fabrication.

Purpose of the Study:

To investigate the effect of substrate miscut on AlGaN/GaN HEMT structures.
To determine the optimal miscut angle for enhanced device properties.
To identify the primary factors affecting 2D electron gas mobility.

Main Methods:

Epitaxial growth of AlGaN/GaN HEMTs on miscut Si(111) wafers using metalorganic vapor phase epitaxy (MOVPE).
Analysis of strain evolution, surface morphology, and 2D electron gas mobility.
Numerical analysis to correlate interface properties with electron mobility.

Main Results:

Wafer misorientation affects strain evolution and surface morphology during growth.
A weak optimum in 2D electron gas mobility was observed at a 0.5° miscut angle.
Numerical analysis identified interface roughness as a major factor influencing electron mobility variations.

Conclusions:

Substrate miscut is a critical parameter influencing AlGaN/GaN HEMT properties.
Optimizing substrate miscut can enhance electron mobility in HEMTs.
Interface roughness plays a significant role in determining electron mobility, guiding future material optimization efforts.