Methods for fabricating flash memory devices
First Claim
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1. A method for fabricating a memory device, the method comprising the steps of:
- forming a first ONO gate stack and a second ONO gate stack overlying a substrate;
etching a trench into the substrate between the first gate stack and the second gate stack, wherein the trench is etched to a depth in the range of about 100 to about 800 angstroms as measured from a surface of the substrate; and
forming a first impurity doped region within the substrate underlying the trench.
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Abstract
Methods for fabricating flash memory devices are provided. In accordance with an exemplary embodiment of the invention, a method for fabricating a memory device comprises forming a first gate stack and a second gate stack overlying a substrate. A trench is etched into the substrate between the first gate stack and the second gate stack. A first impurity doped region is formed within the substrate underlying the trench.
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Citations
22 Claims
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1. A method for fabricating a memory device, the method comprising the steps of:
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forming a first ONO gate stack and a second ONO gate stack overlying a substrate; etching a trench into the substrate between the first gate stack and the second gate stack, wherein the trench is etched to a depth in the range of about 100 to about 800 angstroms as measured from a surface of the substrate; and forming a first impurity doped region within the substrate underlying the trench. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A method far fabricating a dual bit memory device, the method comprising the steps of:
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fabricating a charge trapping ONO stack overlying a substrate; forming a control gate material overlying the charge trapping stack; etching the control gate material and the charge trapping stack to the substrate; etching the substrate to form a trench having a depth in the range of about 100 to about 800 angstroms as measured from a surface of the substrate; and implanting a first impurity dopant within the substrate underlying the trench to form a first bitline region. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19)
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20. A method for fabricating a memory device, the method comprising the steps of:
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fabricating a first ONO gate stack and a second ONO gate stack overlying a substrate; forming a first impurity doped region in the substrate between the first gate stack and the second gate stack; fabricating gate spacers about sidewalls of the first gate stack and the second gate stack after the step of forming the first impurity doped region; and forming a second impurity doped region in the substrate between the first gate stack and the second gate stack after the step of fabricating the gate spacers, wherein the second impurity doped region is deeper than the first impurity doped region. - View Dependent Claims (21, 22)
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Specification