Toyokazu Ohnishi

Title: The Innovations of Toyokazu Ohnishi

Introduction

Toyokazu Ohnishi is a notable inventor based in Isehara, Japan. He has made significant contributions to the field of microelectronics, particularly through his innovative work on thin film resistors. His expertise and inventions have had a lasting impact on semiconductor technology.

Latest Patents

Ohnishi holds a patent for a thin film resistor designed for integrated circuit semiconductor devices. This resistor features a resistive layer made of silicon nitride (Si₃N₄) combined with refractory metals such as tungsten and/or molybdenum. The unique structure of the resistor allows for a silicon nitride layer that contains grains of metal and/or metal silicide. The resistivity of the device is primarily determined by the silicon nitride, enabling control over the total resistance by adjusting the amount of silicon nitride. This innovation provides a wide resistivity range from 10⁻³ to 10⁹ Ω.cm. Additionally, the resistor demonstrates immunity to dopants in adjacent layers, showcasing heat resistivity and low activation energy of resistivity, as confirmed by experimental results.

Career Highlights

Ohnishi is associated with Fujitsu Corporation, where he has been able to apply his innovative ideas in a practical setting. His work has contributed to advancements in microelectronic devices, enhancing their performance and reliability.

Collaborations

Throughout his career, Ohnishi has collaborated with esteemed colleagues such as Naoki Yokoyama and Nobuo Toyokura. These partnerships have fostered a collaborative environment that encourages innovation and the sharing of ideas.

Conclusion

Toyokazu Ohnishi's contributions to the field of microelectronics, particularly through his patented thin film resistor, highlight his role as a significant inventor. His work continues to influence the development of advanced semiconductor technologies.