A retrograde well structure for a CMOS imager that improves the quantum efficiency and signal-to-noise ratio of the imager. The retrograde well comprises a doped region with a vertically graded dopant concentration that is lowest at the substrate surface, and highest at the bottom of the well. A single...http://www.google.de/patents/US6787819?utm_source=gb-gplus-sharePatent US6787819 - Retrograde well structure for a CMOS imager
