Patent ID: 7385172

Claim:
A photoelectric conversion device including pixels arranged in an array, each of said pixels comprising: a light receiving region for converting light to signal charges; transistors; and an insulation film arranged on a surface of said light receiving region, and under gate electrodes of said transistors, wherein a reflection prevention film having a refractive index higher than that of said insulation film is arranged at least above said light receiving region, with said insulation film arranged between said reflection prevention film and said light receiving region, and has a silicon nitride film, an interlayer insulation film is arranged on said reflection prevention film, a second reflection prevention film is laminated between said reflection prevention film and said interlayer insulation film, and at least one of side walls of said gate electrodes of said transistors is comprised of said silicon nitride film and a silicon oxide film arranged between said silicon nitride film and said gate electrodes, in which a transistor having such a side wall of a gate electrode comprises a source or drain region of LDD structure, and in which a heavily doped region of said source or drain region of said LDD structure is self aligned to said side wall formed from said silicon nitride film and said silicon oxide film.