Patent ID: 6225164
Filing Date: 2001-05-01
Classification: H01L

Abstract:
A method for fabricating a semiconductor memory, comprising the steps of:(1) forming a field oxide film on a semiconductor substrate in one direction;(2) depositing a material for forming floating gate on an entire surface, and forming and stacking a first and a second masking material layers;(3) selectively patterning the first and second masking material layers, and forming masking sidewalls at sides thereof;(4) using the first and second masking material layers and the masking sidewalls in conducting an isotropic etching for first time patterning of the material layer for forming a floating gate, to form a separation region in the first direction on the field oxide film;(5) forming an interlayer insulating layer, and a control gate forming material layer on an entire surface in succession;(6) selectively patterning the control gate forming material layer to form a control gate separated in a second direction;(7) using the control gate in patterning the floating gate forming material layer for the second time, and processing impurity implanting for forming source/drain.