Patent ID: 8368134
Filing Date: 2013-02-05
Classification: H01L

Abstract:
1. A nonvolatile memory device, comprising: a substrate; a pair of floating gate structures, comprising a tunnel insulating layer and a floating gate disposed on the substrate and facing each other, wherein the pair of the floating gate structures are isolated from each other by a trench; a first insulating layer conformably disposed on sidewalls of the trench and the substrate in the trench; a second insulating layer, conformably disposed on the first insulating layer on the sidewalls of the trench; a third insulating layer, comprising a first portion disposed on the second insulating layer on the sidewalls of the trench, and a second portion disposed on the first insulating layer on the substrate, wherein the first portion has a thickness thinner than that of the second portion; and a control gate, disposed on the third insulating layer in the trench.