Toshiharu Marui

Title: The Innovations of Toshiharu Marui

Introduction

Toshiharu Marui is a prominent inventor based in Tokyo, Japan. He has made significant contributions to the field of semiconductor technology, particularly in the development of high electron mobility transistors (HEMTs). With a total of 3 patents to his name, Marui continues to push the boundaries of innovation in his field.

Latest Patents

One of Marui's latest patents is titled "AlGaN/GaN HEMT with normally-off threshold minimized and method of manufacturing the same." This patent describes a method for forming a gate recess on an epitaxial wafer, which includes a semiconductor layer with varying band gap energy. The process involves irradiating ultraviolet light to etch the specific semiconductor layer while protecting it with a SiN surface layer. This innovative approach results in a gate recess that is free from plasma ion-induced damage.

Another notable patent is the "Method for manufacturing a field effect transistor having a field plate." This invention outlines a process where a gate electrode is formed using a first photoresist pattern on an insulating film. By applying reactive ion etching, the surface of a GaN semiconductor layer is exposed, allowing for the evaporation of gate metal to create the gate electrode. This method prevents the formation of an oxidized film on the semiconductor surface, enhancing the device's performance.

Career Highlights

Toshiharu Marui is currently employed at Oki Electric Industry Co., Ltd., where he continues to innovate in the semiconductor sector. His work has been instrumental in advancing the technology behind field effect transistors, which are crucial for various electronic applications.

Collaborations

Throughout his career, Marui has collaborated with notable colleagues, including Hideyuki Okita and Shinichi Hoshi. These partnerships have fostered a creative environment that encourages the exchange of ideas and technological advancements.

Conclusion

Toshiharu Marui's contributions to semiconductor technology through his patents and collaborations highlight his role as a leading inventor in the field. His innovative methods for manufacturing advanced transistors continue to influence the industry and pave the way for future developments.