Studying defects in the silicon lattice using CCDs

Hall, D.; Murray, Neil J.; Gow, Jason; Wood, Daniel; Holland, A. D.

doi:10.1088/1748-0221/9/12/c12004

Cited by 10 publications

(11 citation statements)

References 20 publications

(32 reference statements)

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“…However as shown by the dashed overlaid traces in Figure 4 a good fit is not possible at higher values of n which indicates that another mechanism is affecting the CTI which is not accounted for in Equation 2.2. The same initial non-linear feature for low numbers of transfers has been seen previously in testing for CCDs on the Euclid VIS instrument at longer integration times [12]. This effect is thought to be caused by the signal electrons in that region seeing a lower number of longeremission-time (slow) traps due to travelling through fewer unfilled slow traps; in general, the X-ray signal will travel through the number of slow traps between X-ray events (as once filled they can no longer trap charge).…”

Section: X-ray Ctisupporting

confidence: 75%

Effects of Temperature Anneal Cycling on a Cryogenically Proton Irradiated CCD

Parsons,

Buggey,

Holland

et al. 2021

Preprint

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Throughout a typical Earth orbit a satellite is constantly bombarded by radiation with trapped and solar protons being of particular concern as they gradually damage the focal plane devices throughout the mission and degrade their performance. To understand the impact the damage has on CCDs and how it varies with their thermal history a proton radiation campaign has been carried out using a CCD280. The CCD is irradiated at 153 K and gradually warmed to 188 K in 5 K increments with Fe 55 X-ray, dark current and trap pumping images taken at 153 K after each anneal step.The results show that despite the trap landscape changing throughout the anneal it has little impact on parallel charge transfer inefficiency. This is thought to be because most traps are unaffected and a lot of those that do anneal only move from the continuum between distinct trap species and into a nearby divacancy trap "peak" whose emission time constant is similar enough to still impact the CTI.In terms of using a CCD280 or similar devices in a mission the CTI being unaffected by thermal annealing up to 188 K means that any CTI correction needed as the radiation damage builds up does not have to take into account the thermal history of the focal plane. However, it is possible that a significant amount of annealing will occur at temperatures greater than 188 K and care should be taken when a mission is operating in this range to gather accurate pre-flight data K : CCD, radiation damage, temperature annealing, radiation damage, X-ray detectors, trap pumping, charge transfer inefficiency

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Section: X-ray Ctisupporting

confidence: 75%

Effects of Temperature Anneal Cycling on a Cryogenically Proton Irradiated CCD

Parsons,

Buggey,

Holland

et al. 2021

Preprint

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“…These A-centers are deemed to be effective traps that have a detrimental impact upon device performance. 8,9 Therefore it is necessary to suppress their concentration and for this purpose numerous defect engineering strategies have been proposed.…”

Section: Introductionmentioning

confidence: 99%

Controlling A-center concentration in silicon through isovalent doping: mass action analysis

Christopoulos

Parfitt

Sgourou

et al. 2016

J Mater Sci: Mater Electron

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It has been determined experimentally that doping silicon with large isovalent dopants such as tin can limit the concentration of vacancy-oxygen defects, this in turn, can be deleterious for the materials properties and its application. These results have been supported by recent calculations based on density functional theory employing hybrid functional. In the present study, we employ mass action analysis to calculate the impact of germanium, tin and lead doping on the relative concentrations of vacancyoxygen defects and defect clusters in silicon under equilibrium conditions. In particular, we calculate how much isovalent doping is required to constrain vacancy-

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“…The prior model implementation used a power law parameterization [4] to extrapolate packet volume at full capacity down to the packet size of interest. Trap species that have been experimentally verified to exist in the irradiated CCD201 [5] and their properties are summarized in Table 1. Each trap species has a proportionality constant, a, called the defect scaling factor, which defines its prevalence in the silicon lattice (i.e.…”

Section: Statistics Of Trap Capture and Releasementioning

confidence: 99%

WFIRST coronagraph detector trap modeling results and improvements

Effinger

Nemati

Rizzo

et al. 2018

High Energy, Optical, and Infrared Detectors for Astronomy VIII

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The WFIRST coronagraph is being designed to detect and characterize mature exoplanets through the starlight reflected from their surfaces and atmospheres. The light incident on the detector from these distant exoplanets is estimated to be on the order of a few photons per pixel per hour. To measure such small signals, the project has baselined the CCD201 detector made by e2v, a low-noise and high-efficiency electron-multiplying charge-coupled device (EMCCD), and has instituted a rigorous test and modeling program to characterize the device prior to flight. An important consideration is detector performance degradation over the proposed mission lifetime due to radiation exposure in space. To quantify this estimated loss in performance, the project has built a detector trap model that takes into account detailed trap interactions at the sub-pixel level, including stochastic trap capture and release, and the deferment of charge into subsequent pixels during parallel and serial clocking of the pseudo-two-phase CCD201 device. This paper describes recent detector trap model improvements and modeling results.

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Studying defects in the silicon lattice using CCDs

Cited by 10 publications

References 20 publications

Effects of Temperature Anneal Cycling on a Cryogenically Proton Irradiated CCD

Effects of Temperature Anneal Cycling on a Cryogenically Proton Irradiated CCD

Controlling A-center concentration in silicon through isovalent doping: mass action analysis

WFIRST coronagraph detector trap modeling results and improvements

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