Ultra-Smooth Single-Crystal Diamond Surfaces for Enhanced Device Performance

Reduces Surface Roughness and Spike Density Through Extended UV-Ozone Exposure

This diamond smoothing method via extended UV-ozone exposure enhances device performance and reliability by reducing surface roughness and spike density. Diamond-based devices, such as rectifiers, offer significant potential for high-power and high-frequency applications. These devices possess exceptional properties, including high breakdown voltage, low leakage current, and high thermal conductivity. However, production is hindered by current surface smoothing technologies’ limitations. Existing methods often rely on material removal through etching, which result in an uneven surface, forming etch pits. These damages to the device surface cause increased leakage currents, reduced breakdown voltages, and degraded electronic and thermal properties, ultimately reducing the device’s reliability and performance. To overcome the challenges and unlock the full potential of diamond-based devices, there is an evident need for a non-invasive, reliable technique to achieve ultra-smooth diamond surfaces.

Researchers at the University of Florida have developed a diamond smoothing method via extended UV-ozone exposure that enhances device performance and reliability by reducing surface roughness and spike density. It enables the production of ultra-smooth, high-quality diamond devices with improved breakdown voltages, reduced leakage currents, and enhanced thermal conductivity. By providing a non-invasive way to smoothen diamond surfaces, this method offers a competitive advantage in the development of high-power electronic devices and holds great potential to revolutionize industries such as power electronics.

Application

UV-ozone smoothing method supports manufacturing ultra-smooth diamond surfaces for high-power and high-frequency electronic devices

Advantages

• Improves surface roughness, enabling high-quality diamond-based rectifiers
• Increases breakdown voltage by 30% through 60 minutes of exposure, enhancing device performance and reducing failure rates
• Preserves diamond lattice integrity, minimizing defects and maintaining material properties
• Boosts nitrogen-vacancy (NV) center quality, paving the way for greater potential for quantum sensing, information processing, and communication applications

Technology

This diamond smoothing technology via extended UV-ozone exposure enhances device performance and reliability by reducing surface roughness and spike density. Extended UV-ozone exposure progressively oxidizes surface irregularities, eliminating high-aspect-ratio spikes and reducing root-mean-square (RMS) surface roughness. Additionally, this method avoids creating new defects or damaging the diamond surface. The reaction of ozone with surface contaminants results in a smooth and defect-free surface.