Patent ID: 7439604
Filing Date: 2008-10-21
Classification: H01L

Abstract:
1. A semiconductor device, comprising: a semiconductor substrate having first and second regions defined thereon; a first trench in the first region and a second trench in the second region; a first dielectric layer on the first region of the semiconductor substrate to conformally cover inside surfaces of the first trench, wherein a thickness of the first dielectric layer is substantially the same on the inside surfaces of the first trench as it is on a surface of the semiconductor substrate in the first region; and a second dielectric layer having a dielectric constant higher than that of the first dielectric layer, on both the first and second regions to conformally cover the inside surfaces of the first and second trenches, wherein a thickness of the second dielectric layer is substantially the same on the inside surfaces of the first and second trenches as it is on a surface of the semiconductor substrate in the first region and a surface of the semiconductor substrate in the second region.