Patent ID: 8344446
Filing Date: 2013-01-01
Classification: H01L

Abstract:
1. A nonvolatile storage device, comprising: a semiconductor substrate; a gate electrode provided on the semiconductor substrate; a first impurity diffusion region and a second impurity diffusion region which are provided in the semiconductor substrate on opposite sides sandwiching the gate electrode; and a film stack extending from between the semiconductor substrate and the gate electrode onto at least a surface of the gate electrode lying on a first impurity diffusion region side and being in contact with the first impurity diffusion region, the film stack including a charge accumulating layer and a tunnel insulating film sequentially from a gate electrode side, wherein an insulating film A is located in at least a part of a portion of the film stack and further wherein the insulating film A is located between the first impurity diffusion region and the second impurity diffusion region but absent on the first impurity diffusion region, and has a lower charge trap surface density than a portion of the charge accumulating layer located on the first impurity diffusion region.