Patent ID: 6518115
Filing Date: 2003-02-11
Classification: H01L

Abstract:
A method for fabricating a CMOS image sensor having a plurality of unit pixels, each unit pixel having a light sensing region and a peripheral circuit region, comprising the steps of:a) providing a semiconductor substrate of the first conductive type; b) sequentially forming a gate oxide layer and a gate electrode on the peripheral circuit region of the semiconductor substrate; c) forming a first doping region of a second conductive type on the light sensing region of the semiconductor substrate, wherein the first doping region is extended only up to an outer edge of the gate electrode; d) forming spacers on sidewalls of the gate oxide layer and the gate electrode, wherein one spacer is formed on the light sensing region; and e) performing an ion implantation to form a second doping region of the first conductive type, wherein the second doping region is extended only up to an outer edge of the one spacer formed on the light sensing region.