This step deposits and patterns the Red color filter element directly over the designated photodiode array on the backside of the thinned silicon substrate A1.In a backside illuminated (BSI) CMOS image sensor, the color filter array is placed on the backside optical stack to minimize the distance to the pinned photodiode, thereby reducing optical and carrier crosstalk P2.A color imager relies on these coated filters to separate incoming white light into primary red, green, and blue signals for l