Method, apparatus, and system for flash memory
First Claim
1. An apparatus comprising:
- a substrate including a central region and a peripheral region;
a plurality of layers above a surface of the substrate, the plurality of layers covering at least a portion of the central region and at least a portion of the peripheral region adjacent to the portion of the central region covered by the plurality of layers, the plurality of layers including a mask layer overlaying the substrate and a hard mask layer overlaying the mask layer, the hard mask layer having a hard mask layer top surface;
a first plurality of pitch-multiplied oxide spacers on the hard mask layer top surface, the first plurality of pitch-multiplied oxide spacers being above the central region of the substrate and including at least one pitch-multiplied oxide spacer having a substantially flat surface at a boundary between the central region and the peripheral region and a curved surface extending from the hard mask layer top surface up to the substantially flat surface; and
a second plurality of pitch-multiplied oxide spacers on the hard mask layer top surface, the second plurality of pitch-multiplied oxide spacers above the peripheral region and including at least one pitch-multiplied oxide spacer having a substantially flat surface at a distance from the at least one pitch multiplied oxide spacer having the substantially flat surface at the boundary, the distance no less than a width at the hard mask layer top surface between two of the plurality of pitch-multiplied oxide spacers above the central region, and no more than a width at the hard mask layer top surface of a second mask above an interconnect in the peripheral region and adjacent to the boundary.
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Accused Products
Abstract
Embodiments of the present invention provide apparatus, methods and systems that include a substrate including a central region and a peripheral region; a plurality of layers above a surface of the substrate, a first plurality of pitch-multiplied spacers on a top surface of the plurality of layer, the first plurality of pitch-multiplied spacers being above the central region of the substrate, and a second plurality of pitch-multiplied spacers on the top surface of the plurality of layers, the second plurality of pitch-multiplied spacers above the peripheral region and including at least one pitch-multiplied spacer having a surface at a distance from the at least one pitch multiplied spacer having a surface at the boundary.
25 Citations
10 Claims
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1. An apparatus comprising:
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a substrate including a central region and a peripheral region; a plurality of layers above a surface of the substrate, the plurality of layers covering at least a portion of the central region and at least a portion of the peripheral region adjacent to the portion of the central region covered by the plurality of layers, the plurality of layers including a mask layer overlaying the substrate and a hard mask layer overlaying the mask layer, the hard mask layer having a hard mask layer top surface; a first plurality of pitch-multiplied oxide spacers on the hard mask layer top surface, the first plurality of pitch-multiplied oxide spacers being above the central region of the substrate and including at least one pitch-multiplied oxide spacer having a substantially flat surface at a boundary between the central region and the peripheral region and a curved surface extending from the hard mask layer top surface up to the substantially flat surface; and a second plurality of pitch-multiplied oxide spacers on the hard mask layer top surface, the second plurality of pitch-multiplied oxide spacers above the peripheral region and including at least one pitch-multiplied oxide spacer having a substantially flat surface at a distance from the at least one pitch multiplied oxide spacer having the substantially flat surface at the boundary, the distance no less than a width at the hard mask layer top surface between two of the plurality of pitch-multiplied oxide spacers above the central region, and no more than a width at the hard mask layer top surface of a second mask above an interconnect in the peripheral region and adjacent to the boundary. - View Dependent Claims (2, 3, 4, 5)
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6. A system comprising:
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a processor; a memory device coupled to the processor, the memory device including a substrate including a central region and a peripheral region and a plurality of layers above a surface of the substrate; the plurality of layers above the surface of the substrate covering at least a portion of the central region and at least a portion of the peripheral region adjacent to the portion of the central region covered by the plurality of layers; the memory device formed using a first plurality of pitch-multiplied spacers on a top surface of the plurality of layers, the first plurality of pitch-multiplied spacers being above the central region of the substrate and including at least one pitch-multiplied spacer having a first substantially flat surface at a boundary between the central region and the peripheral region and a first curved surface extending from the top surface up to the first substantially flat surface; and the memory device further formed using a second plurality of pitch-multiplied spacers on the top surface of the plurality of layers, the second plurality of pitch-multiplied spacers above the peripheral region and including at least one pitch-multiplied spacer having a second substantially flat surface at a distance from the at least one pitch multiplied spacer having the first sustainably flat surface at the boundary and including a second curved surface extending from the top surface up to the second substantially flat surface, the distance no less than a width at the top surface between two of the plurality of pitch-multiplied spacers above the central region, and no more than a width at the top surface of a mask above the top surface and above an interconnect in the peripheral region and adjacent to the boundary. - View Dependent Claims (7, 8, 9, 10)
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Specification