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Proceedings Paper

Single event effects in 0.18um CMOS image sensors
Author(s): Joseph E. Rushton; Konstantin D. Stefanov; Andrew D. Holland; Henri Bugnet; Frederic Mayer; Matthew Cordrey-Gale; James Endicott
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Paper Abstract

CMOS image sensors are widely used on Earth and are becoming increasingly favourable for use in space. Advantages, such as low power consumption, and ever-improving imaging peformance make CMOS an attractive option. The ability to integrate camera functions on-chip, such as biasing and sequencing, simplifies designing with CMOS sensors and can improve system reliability. One potential disadvantage to the use of CMOS is the possibility of single event effects, such as single event latchup (SEL), which can cause malfunctions or even permanent destruction of the sensor. These single event effects occur in the space environment due to the high levels of radiation incident on the sensor. This work investigates the ocurrence of SEL in CMOS image sensors subjected to heavy-ion irradiation. Three devices are investigated, two of which have triple-well doping implants. The resulting latchup cross-sections are presented. It is shown that using a deep p well on 18 μm epitaxial silicon increases the radiation hardness of the sensor against latchup. The linear energy transfer (LET) threshold for latchup is increased when using this configuration. Our findings suggest deep p wells can be used to increase the radiation tolerance of CMOS image sensors for use in future space missions.

Paper Details

Date Published: 5 August 2016
PDF: 10 pages
Proc. SPIE 9915, High Energy, Optical, and Infrared Detectors for Astronomy VII, 99152Q (5 August 2016); doi: 10.1117/12.2235212
Show Author Affiliations
Joseph E. Rushton, The Open Univ. (United Kingdom)
Konstantin D. Stefanov, The Open Univ. (United Kingdom)
Andrew D. Holland, The Open Univ. (United Kingdom)
Henri Bugnet, e2v Technologies (France)
Frederic Mayer, e2v Technologies (United Kingdom)
Matthew Cordrey-Gale, e2v Technologies (United Kingdom)
James Endicott, e2v Technologies (United Kingdom)

Published in SPIE Proceedings Vol. 9915:
High Energy, Optical, and Infrared Detectors for Astronomy VII
Andrew D. Holland; James Beletic, Editor(s)

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