Patent ID: 8048742
Filing Date: 2011-11-01
Classification: H01L

Abstract:
1. A method for fabricating a transistor including a bulb-type recess channel, the method comprising: forming a bulb-type recess pattern in a substrate, wherein the bulb-type recess pattern includes a trench pattern and a ball pattern; forming a gate insulating layer over the substrate and the bulb-type recess pattern; forming a first gate conductive layer over the gate insulating layer; forming a void movement blocking layer by forming a liner layer over the first gate conductive layer in the bulb-type recess pattern to fill the bulb-type recess pattern and removing portions of the liner layer such that the void movement blocking layer remains only in the bulb-type recess pattern, wherein the void movement blocking layer, the gate insulating layer, and the first gate conductive layer completely fill the trench pattern; and forming a second gate conductive layer over the void movement blocking layer and the first gate conductive layer, wherein, in removing the portions of the liner layer such that the void movement blocking layer remains only in the bulb-type recess pattern, the first gate conductive layer is not removed in areas of the first gate conductive layer over and outside the bulb-type recess pattern.