Patent ID: 7872298
Filing Date: 2011-01-18
Classification: G11C,H01L

Abstract:
1. A semiconductor device comprising: a semiconductor substrate; a first gate electrode and a second gate electrode each formed over an upper portion of the semiconductor substrate and adjacent to each other; a first layer formed between the first gate electrode and the semiconductor substrate and functioning as a gate dielectric film of the first gate electrode; a second layer formed between the second gate electrode and the semiconductor substrate and including a charge storage portion; a first channel region formed over the semiconductor substrate and positioned under the first gate electrode and the first layer; and a second channel region formed over the semiconductor substrate and positioned under the second gate electrode and the second layer, wherein the first layer contains a metal element, wherein impurities having a reverse conducting type with respect to a conducting type of impurities in the first channel region are doped into the second channel region, and wherein the second channel region includes a region in which an effective charge density of impurities is lower than a charge density of impurities in the first channel region.