Patent ID: 8411187

Claim:
A photoelectric conversion device comprising: a pixel region that includes a plurality of pixels, each pixel including a photoelectric conversion element, an amplifying MOS transistor configured to amplify a signal in response to electric charges of said photoelectric conversion element, and a reset MOS transistor electrically connected to a gate of said amplifying MOS transistor; and a peripheral circuit region arranged outside of said pixel region, said peripheral circuit region including a plurality of MOS transistors configured to at least one of: drive said reset MOS transistors and amplify signals read from said pixel region, said pixel region and said peripheral circuit region being located on a same semiconductor substrate, wherein an impurity concentration in a drain region of each of said reset MOS transistors is lower than an impurity concentration in a drain of each of said MOS transistors arranged in said peripheral circuit region, and wherein a side spacer is disposed on a side wall of a gate electrode of each of said MOS transistors arranged in said peripheral circuit region, and no side spacer is disposed on a side wall of a source region side and a drain region side of a gate electrode of each of said reset MOS transistors.