Memory device comprising an array portion and a logic portion
First Claim
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1. A memory device comprising:
- a substrate having an array portion and a logic portion;
a first plurality of transistor devices including a plurality of semiconductor structures that are recessed in the array portion of the substrate, wherein source and drain regions define at least part of an upper surface of each of the plurality of semiconductor structures, wherein the source and drain regions are co-planar with an uppermost surface of the substrate in the logic portion, and each of the plurality of semiconductor structures include a channel portion that is contiguous with the substrate array portion and adjacent to a gate region; and
a second plurality of transistor devices formed over the logic portion of the substrate, wherein each of the second plurality of transistor devices include a gate oxide layer, a conductive gate layer, and sidewall spacer structures, wherein there is no dielectric layer between the sidewall spacer structures, and wherein the second plurality of transistor devices are formed in a layer that is above the plurality of semiconductor structures,wherein each of the plurality of semiconductor structures occupies an area of the substrate array portion between about 4F2 and about 8F2, wherein F is the minimum resolvable feature size formable using a photolithographic technique that is used to define features of the semiconductor structures, andwherein each of the plurality of semiconductor structures occupies an area of the substrate having a length dimension that is equal to a width dimension.
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Abstract
In an embodiment of the present invention, a method comprises patterning a first plurality of semiconductor structures in an array portion of a semiconductor substrate using a first photolithographic mask. The method further comprises patterning a second plurality of semiconductor structures over a logic portion of a semiconductor substrate using a second photolithographic mask. The method further comprises patterning a sacrificial layer over the first plurality of semiconductor structures using the second photolithographic mask. The sacrificial layer is patterned simultaneously with the second plurality of semiconductor structures.
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Citations
15 Claims
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1. A memory device comprising:
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a substrate having an array portion and a logic portion; a first plurality of transistor devices including a plurality of semiconductor structures that are recessed in the array portion of the substrate, wherein source and drain regions define at least part of an upper surface of each of the plurality of semiconductor structures, wherein the source and drain regions are co-planar with an uppermost surface of the substrate in the logic portion, and each of the plurality of semiconductor structures include a channel portion that is contiguous with the substrate array portion and adjacent to a gate region; and a second plurality of transistor devices formed over the logic portion of the substrate, wherein each of the second plurality of transistor devices include a gate oxide layer, a conductive gate layer, and sidewall spacer structures, wherein there is no dielectric layer between the sidewall spacer structures, and wherein the second plurality of transistor devices are formed in a layer that is above the plurality of semiconductor structures, wherein each of the plurality of semiconductor structures occupies an area of the substrate array portion between about 4F2 and about 8F2, wherein F is the minimum resolvable feature size formable using a photolithographic technique that is used to define features of the semiconductor structures, and wherein each of the plurality of semiconductor structures occupies an area of the substrate having a length dimension that is equal to a width dimension. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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Specification