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Hagiwara AIPS Library Page 6
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August 1-3, 2026, Inner Mongolia, China

International Symposium on Integrated Circuit Design and Integrated Systems (ICDIS2026)


2026_08_01_ICDIS2026.pdf

ICDIS2026

Dr. Yoshiaki Hagiwara is a key note speaker in ICDIS2026

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July 7-10, 2026, Takasaki, Japan

2026_07_01_ICCCAS2026.pdf

2026 15th International Conference on Communications, Circuits and Systems (ICCCAS2026)

ICCCAS2026

Dr. Yoshiaki Hagiwara is an invited speaker in ICCCAS2026

Abstract? The first silicon chip of a PP-NP-P+ double junction type solar cell
was fabricated for an AI self-energy robot vision application.

This PP-NP-P+ double junction photodiode is very attractive cost-wise.
We only need to add one high-energy ion implantation step to form the deep buried N type region and
another low-energy ion implantation step to form the surface P region.

The deep buried N type region is completely depleted,
to provide a free underground long channel for photo-electrons to be directed swiftly
to the small area N+P-P+ single junction outlet drain.

Subsequent steps are identical to the conventional single junction solar cell fabrication.
In external power-off mode, this AI self-energy robot vision chip,
with an image sensor array of N x M pinned-surface buried-channel
P+PNPP+ double junction type photodiodes can also function
as a solar cell energy source unit.

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