Reduced optical absorption for silicon carbide crystalline materials

US12024794B2 · kind B2 · utility

Assignee

• Wolfspeed, Inc. · US

Inventors

• Robert Tyler Leonard · Raleigh, US
• Elif Balkas · Cary, US
• Valeri F. Tsvetkov · Durham, US
• Yuri Khlebnikov · Raleigh, US
• Kathryn A. O'Hara · Raleigh, US
• Simon Bubel · Carrboro, US
• David Phillip Malta · Raleigh, US

Key dates

• Filing date: Jun 17, 2021
• Grant date: Jul 2, 2024
• Expiry date: Dec 21, 2041

Classification

• Technology area (CPC H): Electricity
• CPC primary: H10H20/826
• WIPO field: Surface technology, coating
• WIPO sector: Chemistry

Abstract

Silicon carbide (SiC) crystalline materials and related methods are disclosed that provide SiC crystalline materials with reduced optical absorption. In certain aspects, SiC crystalline materials with reduced absorption coefficients for wavelengths of light within the visible spectrum are disclosed. Various peaks in absorption over a wavelength spectrum may be reduced in SiC crystalline materials to improve overall absorption coefficient uniformity across the visible spectrum. By providing such improvements in absorption coefficients for SiC crystalline materials, reduced reflection and transmission losses of light in corresponding devices may be realized. Related methods are disclosed that include various combinations of crystalline growth, with and without various post-growth thermal conditioning steps.