Yukio Karasawa

Title: Innovations by Yukio Karasawa

Introduction

Yukio Karasawa is a notable inventor based in Gunma-ken, Japan. He has made significant contributions to the field of semiconductor technology, particularly in the treatment and evaluation of silicon single crystals. With a total of 6 patents to his name, his work has had a profound impact on the production of large-scale integrated circuits (LSI).

Latest Patents

One of his latest patents is focused on the heat treatment of silicon single crystals. This method involves heat-treating a silicon wafer cut from a single crystal grown by the Czochralski method at a temperature ranging from 1,150°C to 1,280°C. This process effectively eliminates crystal defects, resulting in a silicon wafer with excellent oxide film dielectric breakdown voltage characteristics. Consequently, this innovation ensures a high yield in LSI production.

Another significant patent by Karasawa is a method for testing the electrical properties of silicon single crystals. This method evaluates the oxide film dielectric breakdown voltage by cutting a wafer from the single crystal rod and etching its surface with a mixed solution of hydrofluoric acid and nitric acid. This process relieves strain and induces pits and scale-like patterns on the wafer's surface. By determining the density of these patterns, the method allows for an accurate evaluation of the oxide film dielectric breakdown voltage.

Career Highlights

Yukio Karasawa is currently associated with Shin-Etsu Handotai Co., Ltd., a leading company in the semiconductor industry. His work has been instrumental in advancing the technology used in silicon wafers, which are critical components in electronic devices. His innovative approaches have contributed to the efficiency and reliability of semiconductor manufacturing.

Collaborations

Throughout his career, Karasawa has collaborated with esteemed colleagues such as Izumi Fusegawa and Hirotoshi Yamagishi. These partnerships have fostered a collaborative environment that encourages innovation and the sharing of ideas in the field of semiconductor research.

Conclusion

Yukio Karasawa's contributions to semiconductor technology through his patents and collaborations have significantly advanced the industry. His innovative methods for heat treatment and testing of silicon single crystals continue to influence the production of high-quality electronic components.