Patent ID: 9735169
Date: 2017-08-15
CPC Classifications: H01L

Claim:
1. A semiconductor device comprising: a semiconductor substrate; a projecting portion serving as a part of the semiconductor substrate, projected from a main surface of the semiconductor substrate, and extending in a first direction when seen in a plan view; a first gate electrode formed over the projecting portion and extending in a second direction intersecting with the first direction when seen in a plan view; a first gate insulating film formed between the first gate electrode and the projecting portion; a second gate electrode formed over the projecting portion, extending in the second direction when seen in a plan view, and adjacent to the first gate electrode; and a second gate insulating film formed between the second gate electrode and the projecting portion and between the second gate electrode and the first gate electrode and including a charge storage unit inside, wherein the projecting portion includes: wherein the first gate electrode covers a first upper surface of the first region, a first side surface of the first region on a second side in the second direction, and a second side surface of the first region on an opposite side of the second side in the second direction, wherein the second gate electrode covers a second upper surface of the second region, a third side surface of the second region on the second side, and a fourth side surface of the second region on the opposite side of the second side, wherein the second upper surface is lower than the first upper surface, and wherein the third side surface is arranged on the opposite side of the second side with respect to the first side surface in the second direction.