Patent ID: 6300160
Filing Date: 2001-10-09
Classification: H01L

Abstract:
A method of forming CCD electrodes within an image sensing device comprising the steps of:providing a substrate with a gate dielectric layer formed on a surface;creating a plurality of phases within the CCD by forming a first set of electrodes by forming a deposited silicon layer on the surface of the CCD;forming a CMP polish stop layer on the deposited silicon layer;removing the deposited layer from areas where the first set of electrodes is to be formed;oxidizing the side walls of the remaining deposited silicon layer;depositing a gate electrode material on the CCD and a polish buffer layer on the gate electrode material;polishing the device until the gate electrode material is removed from the areas above the polish stop layer and the deposited silicon;removing the polish stop layer and the unoxidized portion of the deposited silicon layer;depositing a second layer of gate electrode material on the device and a second polish buffer layer on the second gate electrode material; andpolishing the device until there is no second gate electrode material either on top of or in contact with the first gate electrode material.