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Yes, the actual light sensor in any CCD or CMOS imaging device is an ordinary silicon photodiode. However, there's just one silicon crystal (wafer), not an "array of silica crystals". Silica is silicon dioxide, which is an insulator, not a semiconductor. The difference is that in a solar cell, you make one big diode that covers the entire chip/...


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That is indeed the essence of it. CCD's either generate tiny charges upon being hit with light, or otherwise alter the accumulation of charges by the effects of light hitting them. They are made so small, so numerous, and so closely packed together that they can be used to reconstruct a fine-grained light image of an object by reading those charges off them ...


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