There is 2007 presentation by LETI analyzing pixel shrink trends and problems. Slide #17 raises an interesting question: is there a way to use electromagnetic detection device instead of energy-type device, like photodiode. The possible benefit is to be limited by thermal noise, rather than by shot noise. Personally, I do not believe that this approach is any better than what a photodiode.
Another 2007 LETI presentation describes wafer level camera concepts. A 2008 LETI presentation mainly talks about IR smart pixels as a way to overcome pixel limitations.
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