Patent ID: 6448611
Filing Date: 2002-09-10
Classification: H01L

Abstract:
A high voltage semiconductor device comprising:a first conductive type semiconductor substrate; a second conductive type well formed at a predetermined region of the semiconductor substrate; a field oxide layer formed on a region other than on an active region of an upper surface of the well; the drain region formed within the active region positioned at one end of the field oxide layer within the well, the drain region being spaced apart from an edge of the field oxide layer at a predetermined interval; a drift region formed within the second conductive type well to surround the drain region, the drift region doped with the same conductive impurity as that of the drain region but with a lower concentration than that of the drain region; the source region formed within the active region positioned at the other end of the field oxide layer, the source region being spaced apart from the edge of the field oxide layer; a gate electrode formed on an upper surface of the field oxide layer and on the upper surface of the second conductive type well between the source region and the drain region; a field plate covering and contacting a portion of the field oxide layer, said field plate being extended to over the gate electrode, and covering a partial portion of the upper surface of the active region and the edge of the field oxide layer to separate the drain region from the field oxide layer at a predetermined interval; a second insulation layer covering the field plate and the gate electrode and having a contact hole at a portion of the source and drain region; and a source electrode and a drain electrode formed at the contact hole.