Patent ID: 7863077
Filing Date: 2011-01-04
Classification: H01L

Abstract:
1. A method of manufacturing an image sensor, the method comprising: providing a semiconductor substrate comprising a photodiode region, a transistor region, and a floating diffusion region; forming a first dielectric comprising an upper dielectric and a lower dielectric on the semiconductor substrate, wherein the upper dielectric extends above the surface of the semiconductor substrate and the lower dielectric, extends below the surface of the semiconductor substrate; forming a gate dielectric consisting of a portion of the lower dielectric in the transistor region and forming a first dielectric pattern in the photodiode region and the floating diffusion region by removing at least a portion of the upper dielectric in the transistor region; forming a second dielectric under the gate dielectric by forming a dummy dielectric on the first dielectric pattern and the gate dielectric and performing a heat-treating process, wherein during the heat-treating process the second dielectric forms under the gate dielectric; and removing the dummy dielectric.