Patent ID: 6136635
Filing Date: 2000-10-24
Classification: H01L

Abstract:
A method for forming an active pixel sensor cell in a semiconductor material of a first conductivity type, the semiconductor material having a surface and a well region of a second conductivity type, the method comprising the steps of:forming a base region of the first conductivity type in the well region;forming an emitter region of the second conductivity type in the base region;forming a first layer of conductive material on the surface of the semiconductor material over the base region;etching the first layer of conductive material to form a first structure and a second structure on the surface of the semiconductor material, the first structure including a region of the second conductivity type that contacts the surface of the semiconductor material, the second structure including a region of the first conductivity type that contacts the surface of the semiconductor material, the first and second structures being spaced apart; andforming a second layer of conductive material over the second structure.