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Dark count or Dark Current is one of the most important CCD specifications, along with resolution, quantum efficiency and noise figure.
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Dark count or Dark Current is one of the most important CCD specifications, along with resolution, quantum efficiency and noise figure. Dark current causes an output to occur without the previous introduction of an input. This is caused by the thermal generation and then diffusion of charge. This Dark Current is generated at different locations in the CCD, but the cause of this charge generation is basically the same in all locations. This is because all cases are to do with irregularities in the fundamental crystal structure of the silicon present in CCDs. Examples of these irregularities include metal impurities such as gold, copper or iron, and crystal defects such as dislocations and stacking faults, all of which are known to be thermal generation sites of charge carriers in silicon. THE BEST EXAMPLE OF WHERE THIS DARK Current can be located is at the Silicon Oxide to silicon interface of...
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