Akihito Sawa

Title: Akihito Sawa: Innovator in Nonvolatile Semiconductor Technology

Introduction

Akihito Sawa is a prominent inventor based in Tsukuba, Japan. He has made significant contributions to the field of semiconductor technology, particularly in the development of nonvolatile memory devices. With a total of 5 patents to his name, Sawa's work has paved the way for advancements in memory storage solutions.

Latest Patents

Sawa's latest patents include innovations such as a nonvolatile variable resistive element and a nonvolatile semiconductor memory device. The nonvolatile semiconductor memory device is designed to be large-capacity and inexpensive, effectively preventing leak currents while operating at high speeds. This device utilizes a nonvolatile variable resistive element, which consists of a variable resistor made from a metal oxide film. The resistance of this film changes according to the oxygen concentration within it. The memory cell array incorporates these variable resistive elements, which are sandwiched between first and second electrodes, with a third electrode positioned opposite the variable resistor across an insulation film. Writing operations are performed by applying a voltage to the third electrode, inducing an electric field that alters the resistance state of the variable resistor.

Another notable patent describes a memory cell array with a 1R structure, composed of nonvolatile variable resistive elements. Each element includes a variable resistor formed from a metal oxide film, with resistance that varies based on the oxygen concentration. The first electrode and the variable resistor create a rectifier junction through an oxide layer, allowing for changes in the thickness of the oxygen depletion layer when voltage is applied. This innovation enhances the rectifying properties of the device, showcasing Sawa's expertise in semiconductor technology.

Career Highlights

Throughout his career, Akihito Sawa has worked with esteemed organizations such as the National Institute of Advanced Industrial Science and Technology and Sharp Corporation. His experience in these institutions has contributed to his development of cutting-edge technologies in the semiconductor field.

Collaborations

Sawa has collaborated with notable colleagues, including Yukio Tamai and Takeshi Fujii. Their combined expertise has fostered innovation and advancement in the technologies they have worked on together.

Conclusion

Akihito Sawa's contributions to nonvolatile semiconductor technology have significantly impacted the field of memory devices. His innovative patents and collaborations highlight his role as a leading inventor in this domain.