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Sensors 2018, 18(6), 1688; https://doi.org/10.3390/s18061688

Multiband Imaging CMOS Image Sensor with Multi-Storied Photodiode Structure

Olympus Corporation, Tokyo 163-0914, Japan
This paper is an expanded version of our published paper: Takemoto, Y.; Kobayashi, K.; Tsukimura, M.; Takazawa, N.; Kato, H.; Suzuki, S.; Aoki, J.; Kondo, T.; Saito, H.; Gomi, Y.; Matsuda, S.; Tadaki Y. Optical characteristics of multi-storied photodiode CMOS image sensor with 3D stacking technology. In Proceedings of the 2017 International Image Sensor Workshop, Hiroshima, Japan, 30 May–2 June 2017.
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Received: 24 February 2018 / Revised: 21 May 2018 / Accepted: 22 May 2018 / Published: 24 May 2018
(This article belongs to the Special Issue Special Issue on the 2017 International Image Sensor Workshop (IISW))
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Abstract

We developed a multiband imaging CMOS image sensor (CIS) with a multi-storied photodiode structure, which comprises two photodiode (PD) arrays that capture two different images, visible red, green, and blue (RGB) and near infrared (NIR) images at the same time. The sensor enables us to capture a wide variety of multiband images which is not limited to conventional visible RGB images taken with a Bayer filter or to invisible NIR images. Its wiring layers between two PD arrays can have an optically optimized effect by modifying its material and thickness on the bottom PD array. The incident light angle on the bottom PD depends on the thickness and structure of the wiring and bonding layer, and the structure can act as an optical filter. Its wide-range sensitivity and optimized optical filtering structure enable us to create the images of specific bands of light waves in addition to visible RGB images without designated pixels for IR among same pixel arrays without additional optical components. Our sensor will push the envelope of capturing a wide variety of multiband images. View Full-Text
Keywords: CMOS image sensor; 3D stacked; near infrared; multiband imaging CMOS image sensor; 3D stacked; near infrared; multiband imaging
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Takemoto, Y.; Tsukimura, M.; Kato, H.; Suzuki, S.; Aoki, J.; Kondo, T.; Saito, H.; Gomi, Y.; Matsuda, S.; Tadaki, Y. Multiband Imaging CMOS Image Sensor with Multi-Storied Photodiode Structure . Sensors 2018, 18, 1688.

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