Fabrication of Schottky Diodes on Zn-polar BeMgZnO/ZnO Heterostructure Grown by Plasma-assisted Molecular Beam Epitaxy

Overview

This study presents a methodology for fabricating high-quality Schottky contacts on Zn-polar BeMgZnO/ZnO heterostructures, crucial for efficient gate modulation in heterostructure field effect transistors (HFETs). The research highlights the implications of this technique for advancing high-frequency, high-power field effect transistors.

Key Study Components

Area of Science

• Neuroscience
• Materials Science
• Electrical Engineering

Background

• Schottky contacts are essential for effective gate modulation in HFETs.
• The study focuses on Zn-polar BeMgZnO/ZnO heterostructures with high-density 2DEG.
• Fabrication is achieved through plasma-assisted molecular beam epitaxy.
• This method can also be applied to other devices like solar detectors and sensors.

Purpose of Study

• To improve the understanding of voltage control over current in zinc oxide-based HFETs.
• To develop a single-step photo-defined gate for field effect transistors.
• To explore the stability of Schottky contacts on single-site devices.

Methods Used

• Preparation of sapphire substrates for deposition.
• Use of metal organic CVD for growth of aluminum nitride and gallium nitride layers.
• Growth of zinc oxide buffer layers using oxygen plasma.
• Monitoring growth patterns to ensure desired thickness and quality.

Main Results

• Successful fabrication of Schottky diodes on Zn-polar heterostructures.
• Demonstrated voltage control over current in the developed HFETs.
• Insights into the stability of Schottky contacts on single-site devices.
• Potential applications in high-frequency and high-power electronics.

Conclusions

• The methodology provides a pathway for efficient gate modulation in HFETs.
• Findings contribute to the development of advanced electronic devices.
• Future research can expand on applications in various sensor technologies.

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