Patent ID: 6589841
Filing Date: 2003-07-08
Classification: H01L

Abstract:
A method of producing a flash memory device on a substrate, comprising:forming a plurality of core stacks on the substrate; forming at least one periphery stack on the substrate; forming a first protective layer of a thickness of less than 200 Ã¥ over the plurality of core stacks, the periphery stack, and the substrate; forming a second protective layer of a thickness less than 350 Ã¥ over the first protective layers; etching back the first protective layer and the second protective layer to form first side walls and second side walls surrounding the core stacks and the periphery stack and extending from the substrate surface to a point below the top of the stacks; forming a plurality of spacers around the second side walls; and forming a high temperature oxide (HTO) layer over the plurality of core stacks, the periphery stack, the side spacers, and the substrate.