Abstract
The CMOS image sensors (CISs) are irradiated with neutron from a nuclear reactor. The dark signal in CISs affected by neutron radiation is studied theoretically and experimentally. The Primary knock-on atoms (PKA) energy spectra for 1 MeV incident neutrons are simulated by Geant4. And the theoretical models for the mean dark signal, dark signal non-uniformity (DSNU) and dark signal distribution versus neutron fluence are established. The results are found to be in good agreement with the experimental outputs. Finally, the dark signal in the CISs under the different neutron fluence conditions is estimated. This study provides the theoretical and experimental evidence for the displacement damage effects on the dark signal CISs.
Highlights
CMOS image sensors (CISs) are widely used in star tracking, medical imaging, space remote sensing, nuclear industry and other scientific fields because of their low power consumption, high levels of integration, low noise, low cost, etc.[1,2] when the CISs are applied in these applications, they will be severely damaged by the particles or rays, such as protons, neutrons, electrons, γ rays, X-rays, etc, leading to image quality degradation or even functional failure.[3,4]Many studies have already been dedicated to the radiation effects on CISs
Fewer studies have focused on the neutron radiation effects on the dark signal of CISs, especially using theoretical models
In summary, the displacement damage effects on CISs induced by neutron irradiation form
Summary
CMOS image sensors (CISs) are widely used in star tracking, medical imaging, space remote sensing, nuclear industry and other scientific fields because of their low power consumption, high levels of integration, low noise, low cost, etc.[1,2] when the CISs are applied in these applications, they will be severely damaged by the particles or rays, such as protons, neutrons, electrons, γ rays, X-rays, etc, leading to image quality degradation or even functional failure.[3,4]. Many studies have already been dedicated to the radiation effects on CISs. Bogaerts et al.[5] have studied the displacement damage effects in STAR250 CISs. Virmontois al.[6,7] have reported the dark current distribution of the CISs under proton and neutron irradiation. Zujun Wang et al.[8,9] have done lots of experiments to study the degradation of CIS induced by total ionizing dose effects and displacement damage effects. Dark signal is an important parameter to be used to evaluate the imaging performance of CISs. fewer studies have focused on the neutron radiation effects on the dark signal of CISs, especially using theoretical models. The dark signal in the CISs under the different neutron fluence conditions would be estimated
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