Stout, Uxa, Buyon & Mullins, LLP
Methods of fabricating high density mask ROM cells
Methods for making integrated circuit devices, such as high density memory devices and memory devices exhibiting dual bits per cell, include forming multiple oxide fences on a semiconductor substrate between multiple polybars. The oxide fences create a hole pre-code pattern that facilitates ion implantation into trenches disposed between the polybars. The holes, or voids, formed by the oxide fences provide greater control of the critical dimension of ion implantation, for example, the critical dimension of the trench sidewalls. Semiconductor devices used in the manufacture of memory devices include the oxide fences during the manufacturing process.
Macronix International Co. Ltd.
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Ching-Yu
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