Location History:
- Tokyo, JP (1993 - 2011)
- Gunma, JP (2010 - 2012)
- Annaka, JP (2005 - 2014)
- Nagano, JP (2021 - 2023)
- Karuizawa-machi, JP (2019 - 2024)
Company Filing History:
29 out of 5,978 
9 out of 1,033 
7 out of 1,099 
Years Active: 1993-2024
Title: Hiroyuki Ohtsuka: Innovator in Solar Cell Technology
Introduction
Hiroyuki Ohtsuka, based in Karuizawa-machi, Japan, is a distinguished inventor with an impressive portfolio of 38 patents. His work primarily focuses on advancements in solar cell technology, contributing significantly to improving photoelectric conversion efficiency.
Latest Patents
One of Ohtsuka's latest patents is for a solar cell with high photoelectric conversion efficiency, accompanied by an innovative method for its manufacturing. This method involves several steps, including the formation of unevenness on both main surfaces of a semiconductor substrate, and the creation of base and emitter layers through a precise diffusion masking process. This approach streamlines production while enhancing energy efficiency.
Another notable patent is for a high-efficiency backside contact solar cell. This design features a p-type region and an n-type region on a crystal silicon substrate, integrating a unique laminated conductor for the positive electrode, which utilizes group III elements judiciously. This development promises to produce low-cost solar cells without compromising on efficiency.
Career Highlights
Throughout his career, Hiroyuki Ohtsuka has worked with prominent companies, notably Shin-Etsu Chemical Co., Ltd. and Kabushiki Kaisha Topcon. His contributions in these organizations have propelled advancements in the production and functionality of solar cells, solidifying his reputation as a pioneer in the field.
Collaborations
Ohtsuka has collaborated with notable individuals such as Takenori Watabe and Hiroshi Hashigami. These partnerships have facilitated knowledge exchange and innovation, greatly influencing the advancement of solar technologies.
Conclusion
Hiroyuki Ohtsuka stands out as a remarkable inventor whose work continues to push the boundaries of solar energy technology. With his extensive patent portfolio and collaborations in the industry, he has made significant strides toward achieving greater efficiency in solar cells, positioning him as a pivotal figure in the renewable energy sector.