Company Filing History:
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Years Active: 1988-2000
Title: Shunji Imanaga: Innovator in Field Effect Transistor Technology
Introduction
Shunji Imanaga is a prominent inventor based in Kanagawa, Japan. He has made significant contributions to the field of semiconductor technology, particularly in the development of field effect transistors (FETs). With a total of 5 patents to his name, Imanaga's work has had a lasting impact on the industry.
Latest Patents
Imanaga's latest patents include a method for manufacturing field effect transistors and a heterojunction field effect transistor. The method for manufacturing a GaN-type field effect transistor involves using a gate insulating film that enhances input amplitude. This design features a channel layer and a gate insulating film that are sequentially laminated on a substrate with a buffer layer in between. The gate electrode is formed on the gate insulating film, with source and drain electrodes positioned on either side, connected to the channel layer through openings. The channel layer is composed of n-type GaN, and the gate insulating film is made from AlN, which provides excellent insulation characteristics, thereby increasing the Schottky barrier and achieving a large input amplitude.
The heterojunction field effect transistor is designed to achieve high performance by significantly reducing source resistance while maintaining high gate resistivity to voltage. This transistor is constructed on a c-face sapphire substrate with multiple layers, including an undoped GaN layer and an n-type AlGaN contact layer. The design allows for the formation of an AlGaN/GaN HEMT, which is crucial for modern electronic applications.
Career Highlights
Throughout his career, Shunji Imanaga has worked with notable companies, including Sony Corporation. He has also served as the Director-General of the Agency of Industrial Science and Technology, where he contributed to advancing industrial research and development in Japan.
Collaborations
Imanaga has collaborated with esteemed colleagues such as Hiroji Kawai and Toshimasa Kobayashi. Their joint efforts have furthered the understanding and application of semiconductor technologies.
Conclusion
Shunji Imanaga's innovative work in the field of field effect transistors has established him as a key figure in semiconductor technology. His patents and career achievements reflect his dedication to advancing this critical area of research.