Patent ID: 7517761
Filing Date: 2009-04-14
Classification: H01L

Abstract:
1. A method for manufacturing a field plate of a high voltage device located on a drift region of a substrate, wherein an isolation structure is located on the drift region, the method comprising: forming a first dielectric layer over the substrate; forming a first patterned conductive layer on the first dielectric layer, wherein the first patterned conductive layer is located over the isolation structure and exposes a portion of a top surface of the first dielectric layer; removing the exposed portion of the first dielectric layer until a top surface of the isolation structure so as to form a plurality of vertical fin-type dielectric bottoms; and forming a second patterned conductive layer over the substrate, wherein the second patterned conductive layer extends downwardly from the top of the first patterned conductive layer and covers the sidewall of each vertical fin-type dielectric bottoms and a portion of the isolation structure exposed by the vertical fin-type dielectric bottoms, and the second patterned conductive layer is insulated from the first patterned conductive layer.