Patent ID: 8669132

Claim:
A manufacturing method of a separation type unit pixel comprising a plurality of transistors for an image sensor, the method comprising: constructing a first wafer comprising a photodiode formed by implanting impurity ions into a semiconductor substrate; constructing a second wafer comprising a pixel array region except the photodiode and a peripheral circuit region; arranging the first wafer and the second wafer up and down for pixel array arrangement; adhering a pad of a unit pixel on the first wafer and the second wafer arranged up and down; forming a first transparent buffer layer on the first wafer; forming a color filter on the first wafer; forming a second transparent buffer layer on the first wafer; and forming a microlens on the first wafer, wherein the first transparent buffer layer is positioned between the semiconductor substrate and the color filter, and wherein the second transparent buffer layer is positioned between the color filter and the microlens.