Patent ID: 7300845
Filing Date: 2007-11-27
Classification: H01L

Abstract:
1. A method of manufacturing a recess type Metal-Oxide Semiconductor (MOS) transistor, the method comprising: ion-implanting a first conductive impurity in an active region of a semiconductor substrate to form a channel impurity region; alternately ion-implanting a second conductive impurity and the first conductive impurity into a portion of the active region where the channel impurity region is disposed to form a first, a second, and a third impurity region having a dual diode structure on the channel impurity region, the second conductive impurity having a conductivity opposite that of the first conductive impurity; opening a trench in a gate region of the semiconductor substrate, the trench piercing the first, the second, and the third impurity regions and having a bottom in the channel impurity region; depositing a gate insulation layer in the gate region of the semiconductor substrate and in the trench; forming a gate stack in the gate region; ion-implanting the first conductive impurity in a source region of the semiconductor substrate where the gate stack was formed to form a fourth impurity region having a boundary with the channel impurity region in the source region; depositing a spacer on a sidewall of the gate stack; and ion-implanting the second conductive impurity in the source region and a drain region using the spacer and the gate stack as an ion implantation mask to form a fifth impurity region.