Patent ID: 6207521
Filing Date: 2001-03-27
Classification: H01L

Abstract:
A method for forming a thin-film resistor on a dielectric layer of a semiconductor wafer comprising:forming a resistance layer, a protective layer and an insulating layer in a predetermined area of the dielectric layer wherein the protective layer is positioned on the resistance layer and the insulating layer is positioned on the protective layer;performing a dry-etching process on the insulating layer in the predetermined area to form two openings extending down to the protective layer, the protective layer being used to prevent plasma damage to the resistance layer from the dry-etching process;performing a wet-etching process on the protective layer through the two openings of the insulating layer to form two openings extending down to the resistance layer; andforming two separate conductive layers in the two openings of the insulating layer and the protective layer, the two conductive layers being used as two electrical terminals for connecting the two ends of resistance layer.