Patent ID: 6620667
Filing Date: 2003-09-16
Classification: H01L

Abstract:
A method of manufacturing an HF power device comprising the steps of:forming a semiconductor layer as a first conductive type on a semiconductor substrate as the first conductive type; etching the semiconductor layer by a given depth and forming a first trench; doping impurity of the first conductive type on the neighborhood of the first trench and forming a first impurity layer as the first conductive type connected to the semiconductor substrate; burying a conduction film as the first conductive type into the first trench; etching the semiconductor layer by a given depth and forming a second trench with a constant interval from the first trench; forming a field oxide film buried into the second trench; forming gate electrode on a given surface of the semiconductor layer; forming a source area of a second conductive type on the surface of the semiconductor layer so as to be structurally self-aligned on one side of the gate electrode and be structurally pierced by the conduction film; forming a drain area as the second conductive type on the surface of the semiconductor layer with a given interval from another side of the gate electrode; forming an LDD area of the second conductive type on the surface of the semiconductor layer between the drain area and the gate electrode; forming first metal electrode having a width which reaches the source area and the gate electrode; and forming second metal electrode electrically connected to the LDD area.