High-Sensitivity Pixels with a Quad-WRGB Color Filter and Spatial Deep-Trench Isolation
Department of Electronics Engineering, Dong-A University, Busan 49315, Korea
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Sensors 2019, 19(21), 4653; https://doi.org/10.3390/s19214653
Received: 2 September 2019 / Revised: 22 October 2019 / Accepted: 24 October 2019 / Published: 26 October 2019
(This article belongs to the Section Optical Sensors)
The demand for a high-resolution metal-oxide-semiconductor (CMOS) image sensor has increased in recent years, and pixel size has shrunk below 1.0 μm to allow accumulation of numerous pixels in a limited area. However, shrinking the pixel size lowers the sensitivity and increases crosstalk because the aspect ratio is worsened by maintaining the height of the pixel. This work introduces a high-sensitivity pixel with a quad-WRGB (White, Red, Green, Blue) color filter array (CFA), spatial deep-trench isolation (S-DTI), and a spatial tungsten grid (S-WG). The optical performance of the suggested pixel was analyzed by performing 3D optical simulations at 1.0, 0.9, and 0.8 μm pixel pitches as small-sized pixels. The quad-WRGB CFA is compared with the quad-Bayer CFA, and the S-DTI and S-WG are compared with the conventional DTI and WG. We confirmed an improvement in the sensitivity of the suggested pixel using the quad-WRGB CFA with S-DTI and S-WG to a maximum of 58.2%, 67.0%, and 66.3% for 1.0, 0.9, and 0.8 μm pixels, respectively.
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Keywords:
quad-WRGB; spatial-DTI; CMOS image sensor
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited
MDPI and ACS Style
Kim, Y.; Kim, Y. High-Sensitivity Pixels with a Quad-WRGB Color Filter and Spatial Deep-Trench Isolation. Sensors 2019, 19, 4653. https://doi.org/10.3390/s19214653
AMA Style
Kim Y, Kim Y. High-Sensitivity Pixels with a Quad-WRGB Color Filter and Spatial Deep-Trench Isolation. Sensors. 2019; 19(21):4653. https://doi.org/10.3390/s19214653
Chicago/Turabian StyleKim, Yongnam; Kim, Yunkyung. 2019. "High-Sensitivity Pixels with a Quad-WRGB Color Filter and Spatial Deep-Trench Isolation" Sensors 19, no. 21: 4653. https://doi.org/10.3390/s19214653
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