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Sensors 2018, 18(1), 305; https://doi.org/10.3390/s18010305

A 750 K Photocharge Linear Full Well in a 3.2 μm HDR Pixel with Complementary Carrier Collection

STMicroelectronics. 850 rue Jean Monnet, 38926 Crolles Cedex. France
This paper is an expanded version of our published paper: Lalanne, F.; Malinge, P.; Hérault, D.; Jamin-Mornet, C. A Native HDR 115 dB 3.2 m BSI Pixel Using Electron and Hole Collection. In Proceedings of the 2017 International Image Sensor Workshop, Hiroshima, Japan, 30 May–2 June 2017.
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Received: 1 November 2017 / Revised: 12 January 2018 / Accepted: 14 January 2018 / Published: 20 January 2018
(This article belongs to the Special Issue Special Issue on the 2017 International Image Sensor Workshop (IISW))
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Abstract

Mainly driven by automotive applications, there is an increasing interest in image sensors combining a high dynamic range (HDR) and immunity to the flicker issue. The native HDR pixel concept based on a parallel electron and hole collection for, respectively, a low signal level and a high signal level is particularly well-suited for this performance challenge. The theoretical performance of this pixel is modeled and compared to alternative HDR pixel architectures. This concept is proven with the fabrication of a 3.2 μm pixel in a back-side illuminated (BSI) process including capacitive deep trench isolation (CDTI). The electron-based image uses a standard 4T architecture with a pinned diode and provides state-of-the-art low-light performance, which is not altered by the pixel modifications introduced for the hole collection. The hole-based image reaches 750 kh+ linear storage capability thanks to a 73 fF CDTI capacitor. Both images are taken from the same integration window, so the HDR reconstruction is not only immune to the flicker issue but also to motion artifacts. View Full-Text
Keywords: HDR imaging; CMOS image sensors; outdoor vision HDR imaging; CMOS image sensors; outdoor vision
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Lalanne, F.; Malinge, P.; Hérault, D.; Jamin-Mornet, C.; Virollet, N. A 750 K Photocharge Linear Full Well in a 3.2 μm HDR Pixel with Complementary Carrier Collection. Sensors 2018, 18, 305.

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