Company Filing History:
Years Active: 2007-2010
Title: Takeo Shirahama: Innovator in Semiconductor Technology
Introduction
Takeo Shirahama 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 advancements in semiconductor lasers and III-V nitride semiconductor devices.
Latest Patents
One of his latest patents is for a semiconductor laser that utilizes a GaN laser. This innovation includes a coating film on the front end surface through which laser light is emitted. The coating film consists of a first insulating film in contact with the front end surface and a second insulating film on top of the first. The optical film thickness of the second insulating film is an odd multiple of λ/4 concerning the wavelength λ of the laser light produced. Additionally, the adhesion of the first insulating film to GaN is stronger than that of the second insulating film. The refractive index of the second insulating film ranges from 2 to 2.3, while the first insulating film is 10 nm or less and is an oxide film with a stoichiometric composition.
Another notable patent involves a method of manufacturing a III-V nitride semiconductor device. In this process, an aluminum gallium nitride/gallium nitride layer is formed on a silicon carbide substrate. The layer is dry-etched using a chlorine-based gas to create a surface via hole. A back via hole, which connects to the surface via hole, is formed by dry-etching the silicon carbide substrate from the back side using a fluorine-based gas.
Career Highlights
Takeo Shirahama is currently employed at Mitsubishi Electric Corporation, where he continues to innovate in semiconductor technology. His work has been instrumental in advancing the capabilities of semiconductor devices, making them more efficient and effective.
Collaborations
He has collaborated with notable coworkers, including Yasuyuki Nakagawa and Harumi Nishiguchi, contributing to various projects and innovations within the company.
Conclusion
Takeo Shirahama's contributions to semiconductor technology through his patents and work at Mitsubishi Electric Corporation highlight his role as a key innovator in the field. His advancements continue to influence the development of efficient semiconductor devices.
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