Masayoshi Umeno

Title: Masayoshi Umeno: Innovator in Semiconductor Technology

Introduction

Masayoshi Umeno is a prominent inventor based in Nagoya, Japan. He has made significant contributions to the field of semiconductor technology, holding a total of 5 patents. His work primarily focuses on the development of advanced techniques for the deposition of gallium arsenide on silicon substrates.

Latest Patents

One of Umeno's latest patents is a masking technique for depositing gallium arsenide on silicon. This innovative process allows for the formation of GaAs on a silicon substrate while minimizing unintended silicon doping. The method involves growing or depositing a dielectric layer of silicon dioxide, silicon nitride, or both on the substrate. A window is then opened in the dielectric layer to expose the silicon substrate in the regions where GaAs is to be formed. The GaAs layer is subsequently formed using conventional techniques, with the dielectric layer inhibiting the gas phase transfer of silicon contamination.

Another notable patent by Umeno is related to the method of making an epitaxial gallium arsenide semiconductor wafer. This wafer includes a monocrystalline silicon substrate with a major surface inclined at an angle between 0.5° and 5° with respect to (100). The design accommodates lattice mismatches between the silicon substrate and the epitaxial GaAs layer, which is grown on the top layer of at least one intermediate layer. This wafer can be utilized to produce semiconductor light-emitting elements and various compound semiconductor devices.

Career Highlights

Throughout his career, Masayoshi Umeno has worked with notable organizations such as Daido Tokushuko Kabushiki Kaisha and the Nagoya Institute of Technology. His experience in these institutions has allowed him to refine his expertise in semiconductor technologies and contribute to groundbreaking innovations.

Collaborations

Umeno has collaborated with esteemed colleagues, including Shiro Sakai and Shinichiro Yahagi. These partnerships have fostered a collaborative environment that has led to significant advancements in their respective fields.

Conclusion

Masayoshi Umeno's contributions to semiconductor technology through his innovative patents and collaborations highlight his role as a key figure in the industry. His work continues to influence the development of advanced semiconductor devices and techniques.