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Silicon Carbide

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Century-Old Pitt Physicist Keeps Working
science11 days ago

Century-Old Pitt Physicist Keeps Working

Jim Choyke, a 100-year-old emeritus professor in Pitt's physics and astronomy department, spent decades studying silicon carbide—the semiconductor material underpinning AI, quantum computing, and advanced batteries. He moved to Pittsburgh in 1952 for a Westinghouse role, joined Pitt in 1974, and says he never believed in retirement because he loves physics. His work and mentorship helped advance the field and inspire a generation of scientists, and he continues to work and teach from his Pitt office.

via post-gazette.com|
#jim-choyke#quantum-mechanics#retirement
Ancient stardust in a 1969 meteorite predates the Sun by billions of years
space2 months ago

Ancient stardust in a 1969 meteorite predates the Sun by billions of years

Tiny silicon carbide grains sealed in the 1969 Murchison meteorite were dated via cosmic-ray exposure, revealing stardust that formed about 7 billion years ago—older than the Sun and the Earth; most grains formed around 4.6–4.9 billion years ago, indicating they originated in earlier generations of stars before the solar system.

via Space Daily|
#cosmic-ray-exposure-dating#murchison-meteorite#presolar-grains
Crystal Clear: Groundbreaking Discovery Shatters Conventional Wisdom
science-and-technology3 years ago

Crystal Clear: Groundbreaking Discovery Shatters Conventional Wisdom

A recent study challenges the conventional definition of crystals by revealing that crystal structures are not always regularly arranged. The discovery of the random stacking of hexagonal layers (RHCP) as a stable structure overturns previous beliefs and has implications for materials science, particularly in semiconductors, solar panels, and electric vehicle technologies. The study provides insights into polytypism and suggests that polytypic materials like silicon carbide may have continuous structural transitions with new useful properties. The research was conducted using X-ray scattering data and advanced computation techniques.

via SciTechDaily|
#close-packed-structures#crystal-structures#materials-science
"Wolfspeed Secures $2B Deposit with 10-Year Chip Contract, Shares Surge 15%"
business3 years ago

"Wolfspeed Secures $2B Deposit with 10-Year Chip Contract, Shares Surge 15%"

Semiconductor company Wolfspeed has secured a 10-year contract with Renesas Electronics, receiving a $2 billion cash infusion. The deal involves the production of chips using silicon carbide technology at a semiconductor plant in Chatham County. Wolfspeed's shares soared 15% following the announcement. Renesas will use the chips in various industries, including automotive and industrial sectors. The agreement strengthens Wolfspeed's position in the growing silicon carbide market.

via WRAL TechWire|
#business#contract#renesas-electronics
technology3 years ago

Renesas and Wolfspeed Secure Decade-Long Silicon Carbide Wafer Deal

Renesas Electronics Corporation and Wolfspeed have signed a 10-year wafer supply agreement, with Renesas depositing $2 billion to secure a supply commitment of silicon carbide wafers from Wolfspeed. The agreement supports the adoption of silicon carbide in automotive, industrial, and energy markets and reinforces Renesas' commitment to boost its power semiconductor roadmap. The supply of high-quality silicon carbide wafers will enable Renesas to scale production of silicon carbide power semiconductors starting in 2025. Silicon carbide devices offer higher energy efficiency, greater power density, and lower system costs compared to conventional silicon power semiconductors.

via Yahoo Finance|
#renesas#semiconductor#silicon-carbide
Wolfspeed's Stock Takes a Hit Due to Mohawk Valley Facility Delays and Tesla SiC Cut Down
business3 years ago

Wolfspeed's Stock Takes a Hit Due to Mohawk Valley Facility Delays and Tesla SiC Cut Down

Wolfspeed's shares fell over 15% in pre-market trading after the semiconductor company issued weaker-than-expected guidance, citing issues at its Mohawk Valley facility. The delay at the facility stems from its inability to ramp its 200mm substrate capacity, leading to a lowered fiscal 2024 revenue guidance. Analysts are questioning whether silicon carbide might be "too hard to scale" given the continued missteps and whether Tesla was right to question its ability to meet the demands for electrification of the economy.

via Seeking Alpha|
#business#guidance#mohawk-valley
High-Pressure Superconducting Magnetic Detection Breakthrough Achieved by Chinese Researchers
science-and-technology3 years ago

High-Pressure Superconducting Magnetic Detection Breakthrough Achieved by Chinese Researchers

A joint research team from the Hefei Institutes of Physical Science of the Chinese Academy of Sciences and the University of Science and Technology of China has developed a research platform to study superconducting magnetic detection and magnetic phase transitions of hydrides under high pressure. The researchers have for the first time realized high-pressure in-situ quantum magnetic detection based on the silicon vacancy (VSi) defects in silicon carbide and solved the problem of high-pressure magnetic detection. This technique is of great significance to the field of high-pressure superconductivity and magnetic materials.

via SciTechDaily|
#high-pressure#magnetic-detection#quantum-materials