Patent ID: 8044455
Filing Date: 2011-10-25
Classification: H01L

Abstract:
1. A semiconductor device having a memory cell formed on a main surface of a semiconductor substrate of a first conductive type, wherein the memory cell includes: a select gate formed on the semiconductor substrate via a first gate insulating film; a memory gate formed on one sidewall of the select gate and insulated from the select gate and the semiconductor substrate via a second gate insulating film; a source region composed of a semiconductor region of a second conductive type and formed in the semiconductor substrate in a vicinity of the select gate; and a drain region composed of a semiconductor region of a second conductive type and formed in the semiconductor substrate in a vicinity of the memory gate, the second gate insulating film includes at least a first potential barrier film and a charge-trapping film stacked on the first potential barrier film, and a substrate interface of the select gate is positioned lower than a substrate interface of the memory gate.