Solid-state image pickup apparatus and image pickup system

A solid-state image pickup apparatus comprising:

• a first semiconductor substrate;
• and
• a second semiconductor substrate,
• wherein the first semiconductor substrate comprises silicon,
• the first semiconductor substrate is provided with a photoelectric conversion element, a gate electrode of a transfer transistor for transferring an electric charge from the photoelectric conversion element, a floating diffusion region where the electric charge is transferred from the photoelectric conversion element by the gate electrode of the transfer transistor, an amplification transistor including a gate electrode to which a signal based on an electrical potential of the floating diffusion region is input, and a reset transistor for setting the gate electrode of the amplification transistor to a reset electrical potential, and
• the first semiconductor substrate is not provided with a layer of silicide,
• wherein the second semiconductor substrate comprises silicon,
• the second semiconductor substrate is provided with a peripheral circuit portion for reading out a signal based on the electric charge generated at the photoelectric conversion element, and
• the second semiconductor substrate is provided with a layer of silicide, and
• wherein the solid-state image pickup apparatus comprises a diffusion prevention film for preventing a diffusion of silicide disposed between the first semiconductor substrate and the second semiconductor substrate.