Patent ID: 8039324

Claim:
A method of fabricating an image sensor comprising: simultaneously forming a first gate and a second gate over a semiconductor substrate; and then forming a photodiode including a first impurity region and a second impurity region in the semiconductor substrate; and then simultaneously forming a third impurity region formed in the semiconductor substrate spaced from the photodiode and a fourth impurity region formed in the semiconductor substrate spaced from the third impurity region; and then sequentially forming a first oxide film and a first nitride film over the semiconductor substrate including the first and second gates and the third and fourth impurity regions; and then forming a first nitride film pattern only over a portion of the first oxide film formed over the fourth impurity region, a first sidewall of the second gate and a first portion of the uppermost surface of the second gate, the first nitride film pattern not covering the entire uppermost surface of the second gate; and then forming a second oxide film over a remaining portion of the first oxide film and the first nitride film pattern; and then simultaneously forming a first oxide film pattern, a second oxide film pattern and a spacer, wherein the first oxide film pattern and the second oxide film pattern are formed over the photodiode, the first gate, the third impurity region, a second sidewall of the second gate and a second portion of the uppermost surface of the second gate and the spacer is formed over the fourth impurity region and on the first sidewall of the second gate.