Patent ID: 8021946
Filing Date: 2011-09-20
Classification: H01L

Abstract:
1. A method for manufacturing a nonvolatile memory device, the method comprising the steps of: forming a first trench in a first isolation area of a substrate having a plurality of isolation areas and a plurality of active areas; forming a photoresist pattern so as to cover an entire surface of the substrate except for the first trench; sequentially forming a first gate oxide layer and a first electrode layer on the entire surface of the substrate including the photoresist pattern and the first trench; forming a protective material layer on the entire surface of the substrate so as to fill the first trench; planarizing the first gate oxide layer, the first electrode layer and the protective material layer, until the photoresist pattern is exposed; etching the first gate oxide layer, the first electrode layer and the protection material to reduce a thickness thereof; forming a spacer at sides of the photoresist pattern so as to cover the first gate oxide and the first electrode layer; removing the exposed protective material using the spacer as a mask; removing the photoresist pattern and the spacer; forming a junction area in at least one active area; forming a second gate oxide layer on the at least one active area; removing a part of the second gate oxide layer on the junction area to expose a part of the junction area; forming a tunnel oxide on the exposed junction area; and forming a second electrode on the at least one active area and in the first trench.