Patent ID: 7883964
Filing Date: 2011-02-08
Classification: G11C,H01L

Abstract:
1. A fabrication method of a nonvolatile semiconductor memory comprising: forming a device isolating region in a semiconductor substrate, a memory cell transistor, select transistors, and a peripheral transistor on the semiconductor substrate; depositing a sidewall insulator film of an oxide film; subjecting the sidewall insulator film to etching so that the sidewall insulator film remains between a sidewall of the select transistors and adjacent memory cell transistor; depositing a barrier insulator film on a surface of the semiconductor substrate; and filling the area between select transistors by depositing a first interlayer film, depositing an intermediate insulator film; removing the first interlayer film between the intermediate insulator film and the select transistor by etching, using an etching condition having selectivity with respect to the barrier insulator film; selectively removing the barrier insulator film, a portion of the barrier insulator film remaining at the sidewalls of the select transistors; depositing a first conductive material; depositing a mask insulator film on the first conductive material; and subjecting the mask insulator film to patterning.