Patent ID: 9012969
Filing Date: 2015-04-21
Classification: H01L

Abstract:
1. A nonvolatile semiconductor memory device comprising: a semiconductor layer having a first area and a second area; an active area formed in the semiconductor layer, extending in a first direction, and including a select transistor, a first memory transistor, and a second memory transistor, the select transistor, the first memory transistor, and the second memory transistor being connected in series; and a device isolation film formed on the semiconductor layer, extending in the first direction, being adjacent to the active area, and having a first height in the first area and a second height higher than the first height in the second area, the first area including a first end of the first memory transistor facing the second memory transistor and a first part of the device isolation film adjacent thereof, and the second area including a second end of the first memory transistor facing the select transistor and a second part of the device isolation film adjacent thereof.