Patent ID: 6080601
Filing Date: 2000-06-27
Classification: H01L

Abstract:
A method for forming an active pixel sensor cell in a semiconductor material of a first conductivity type, the method comprising the steps of:forming a well region of a second conductivity type in the semiconductor material;after the well region has been formed, forming a base region of the first conductivity type in the well region, the base region having a first surface area and a second surface area;after the base region has been formed, forming a first layer of conductive material on the base region;after the first layer of conductive material has been formed, forming a first layer of dielectric material on the first layer of conductive material;after the first layer of dielectric material has been formed, etching the first layer of dielectric material and, after the first layer of dielectric material has been etched, etching the first layer of conductive material to form a region of conductive material on the first surface area of the base region, and a dielectric region overlying the region of conductive material, the region of conductive material having exposed sidewalls;after the region of conductive material and the dielectric region have been formed, forming a second layer of dielectric material on the second surface area of the base region and the exposed sidewalls of the region of conductive material;after the second layer of dielectric material has been formed, forming a second layer of conductive material on the dielectric region and the second dielectric layer; andafter the second layer of conductive material has been formed, etching the second layer of conductive material to form a conductive line over the dielectric region.