Patent ID: 7883922

Claim:
A method for manufacturing an image sensor, comprising: forming a first unit pixel including a first transfer transistor; forming a second unit pixel including a second drive transistor; and forming a contact that electrically connects a floating diffusion region of the first unit pixel with the second drive transistor of the second unit pixel, wherein said forming the contact comprises: forming a first insulator over a first unit pixel region and a second unit pixel region; forming a first contact hole by selectively removing the first insulator over a floating region of the first pixel region; forming a contact that electrically connects the second drive transistor by filing the first contact hole, wherein the contact comprises under insulators between the bottom of the contact and a substrate on which the first unit pixel is formed, wherein a width of the first contact hole is smaller than a width of a top side of the contact, and wherein an outer distance between the under insulators is same as the width of the top side of the contact.