Patent ID: 6074902
Filing Date: 2000-06-13
Classification: H01L

Abstract:
A method of forming complementary type conductive regions on a substrate comprising:providing a first etch stop layer over a substrate;etching a void through the first etch stop layer;providing a first conductive layer of a first conductive material over the first etch stop layer and into the void;removing the first conductive layer over the first etch stop layer to eliminate all first conductive material from atop the first etch stop layer, and leaving first conductive material in the void;removing the remaining first etch stop layer from the substrate thereby defining a remaining region of first conductive layer;providing a second conductive layer of a second conductive material over the substrate and remaining first conductive layer region;removing the second conductive layer over the remaining first conductive layer to eliminate all second conductive material from atop the remaining first conductive layer, and leaving remaining second conductive material atop the substrate which is adjacent the remaining first conductive material region; andafter removing the second conductive layer, patterning and etching the remaining first conductive layer and remaining second conductive layer to define complementary discrete circuit devices from the first and second conductive layers.