Naohisa Toda

Title: Naohisa Toda: Innovator in Silicon Wafer Manufacturing

Introduction

Naohisa Toda is a prominent inventor based in Annaka, Japan. He has made significant contributions to the field of semiconductor technology, particularly in the manufacturing of silicon epitaxial wafers. With a total of 2 patents to his name, Toda's work has had a lasting impact on the industry.

Latest Patents

One of Toda's latest patents is a method of manufacturing silicon epitaxial wafers. This innovative process involves growing a silicon epitaxial layer in vapor phase on a silicon single crystal substrate manufactured by the Czochralski method. The layer is doped with boron to adjust the resistivity to 0.02 Ω·cm or below. Additionally, oxygen precipitation nuclei are formed in the silicon single crystal substrate by annealing at temperatures between 450°C to 750°C in an oxidizing atmosphere. This careful control allows for the formation of a silicon oxide film that is only 2 nm thick on the silicon epitaxial layer. The final residual thickness of the silicon oxide film can be minimized to a level equivalent to a native oxide film, without relying on hydrofluoric acid cleaning. Another notable patent is related to a heat-treating method and radiant heating device.

Career Highlights

Toda has worked with notable companies in the semiconductor industry, including Shin-Etsu Handotai Co., Ltd. and Shin-Etsu Handotai Co., Ltd. His expertise in silicon wafer technology has positioned him as a key figure in advancing manufacturing techniques.

Collaborations

Throughout his career, Naohisa Toda has collaborated with esteemed colleagues such as Naoto Tate and Tomoyuki Sakai. These partnerships have contributed to the development of innovative solutions in the semiconductor field.

Conclusion

Naohisa Toda's contributions to silicon wafer manufacturing and his innovative patents highlight his importance in the semiconductor industry. His work continues to influence advancements in technology and manufacturing processes.