Katsushi Tokunaga

Title: Katsushi Tokunaga: Innovator in Silicon Crystal Technology

Introduction

Katsushi Tokunaga is a prominent inventor based in Kanagawa-ken, Japan. He has made significant contributions to the field of silicon crystal technology, particularly in the production of silicon single crystals and wafers. With a total of 9 patents to his name, Tokunaga's work has had a substantial impact on the solar energy sector.

Latest Patents

One of his latest patents involves a silicon single crystal and wafer doped with gallium, along with a method for producing them. This invention allows for the creation of a silicon single crystal produced using the Czochralski method, where gallium is added as a dopant. The resulting silicon single crystal exhibits a resistivity ranging from 5Ω.cm to 0.1Ω.cm. Additionally, the method ensures that the produced silicon single crystal can be used in solar cells without causing photo-degradation, even in crystals with high oxygen concentration. Another notable patent focuses on Ga-doped multi-crystalline silicon and the method for its production, which also aims to enhance the stability of conversion efficiency for light energy in solar cells.

Career Highlights

Throughout his career, Katsushi Tokunaga has worked with notable companies, including Shin-Etsu Chemical Co., Ltd. His expertise in silicon technology has positioned him as a key figure in the development of materials that are essential for solar energy applications.

Collaborations

Tokunaga has collaborated with esteemed colleagues such as Yoshio Tawara and Hideo Kaneko. These partnerships have further enriched his research and innovations in the field of silicon crystals.

Conclusion

Katsushi Tokunaga's contributions to silicon crystal technology and his innovative patents have significantly advanced the solar energy industry. His work continues to influence the development of efficient solar cells, showcasing the importance of innovation in sustainable energy solutions.