This inventor holds 3 USPTO granted patents and 5 published patent applications and 1 EPO patent. Top assignee: Mitsubishi Electric Corporation. Active years: 2018-2024.
Location History:
- Chiyoda-ku, JP (2023)
- Tokyo, JP (2018 - 2024)
Company Filing History:
Years Active: 2018-2024
Title: Akira Kiyoi: Innovator in Semiconductor Technology
Introduction
Akira Kiyoi is a prominent inventor based in Tokyo, Japan. He has made significant contributions to the field of semiconductor technology, holding a total of 3 patents. His work focuses on innovative methods and devices that enhance semiconductor performance.
Latest Patents
Kiyoi's latest patents include a semiconductor device and a manufacturing method for such devices. The semiconductor device features a first conductivity-type silicon substrate that includes a cell part and a termination part surrounding the cell part. It also incorporates a first conductivity-type emitter layer on the front surface of the silicon substrate in the cell part, along with a second conductivity-type collector layer on the back surface. Additionally, a first conductivity-type drift layer is situated between the emitter and collector layers, and a trench gate reaches the drift layer from the front surface of the emitter layer. Notably, the vacancies included in a crystal defect in the cell part are fewer than those in the termination part.
The method of manufacturing the semiconductor device involves several steps. Acceptor ions are implanted from the back surface of the semiconductor substrate. A wet process is then performed, immersing the substrate in a chemical solution containing hydrofluoric acid to introduce hydrogen atoms. Proton radiation is applied to the back surface to further introduce hydrogen atoms and form radiation-induced defects. Finally, an annealing process is conducted to create hydrogen-related donors through the reaction of hydrogen atoms and radiation-induced defects, thereby reducing the defects.
Career Highlights
Kiyoi is currently employed at Mitsubishi Electric Corporation, where he continues to advance semiconductor technology. His innovative approaches have positioned him as a key figure in the industry.
Collaborations
Kiyoi collaborates with talented coworkers, including Taiki Hoshi and Yuki Haraguchi, who contribute to his projects and research endeavors.
Conclusion
Akira Kiyoi's work in semiconductor technology exemplifies innovation and dedication. His patents reflect a commitment to improving device performance and manufacturing methods. His contributions are significant in shaping the future of semiconductor applications.