Patent ID: 7112511
Filing Date: 2006-09-26
Classification: H01L

Abstract:
1. A method for fabricating a complementary metal oxide semiconductor (CMOS) image sensor with a pixel array including a plurality of unit pixels, the method comprising the steps of: forming a plurality of photodiodes corresponding to the respective unit pixels on a substrate; sequentially forming an inter-layer insulation layer and an uppermost metal line on the substrate and the photodiodes; etching the inter-layer insulation layer in a predetermined depth to form a plurality of trenches corresponding to the respective photodiodes; depositing a high density plasma (HDP) oxide layer such that the HDP oxide layer disposed between the trenches has a tapered profile; depositing a nitride layer having a higher refractive index than that of the inter-layer insulation layer to fill the trenches with a predetermined thickness; and depositing an insulation layer having a lower refractive index than that of the nitride layer to fill the trenches, thereby forming a prism, wherein the prism induces a total reflection of lights incident to the photodiodes disposed in edge regions of the pixel array.