Patent ID: 8450780

Claim:
A solid-state image sensor, comprising a photoelectric converter to store a signal charge that is subjected to photoelectric conversion; a charge detector to detect the signal charge; and a transfer transistor to transfer the signal charge from the photoelectric converter to the charge detector, wherein the transfer transistor includes a gate insulating film, a gate electrode formed on the gate insulating film, a first spacer formed of a first portion of another insulating film, the first portion of the another insulating film formed on a first surface portion of the gate insulating film extending in a length direction, having a first height on a sidewall of the gate electrode on a side of the photoelectric converter, and a second spacer formed of a second portion of the another insulating film, the second portion of the another insulating film formed on a second surface portion of the gate insulating film extending in the length direction, having a second height greater than the first height on another sidewall of the gate electrode on a side of the charge detector, and wherein the first spacer is shorter in the length direction than the second spacer.