THREE-DIMENSIONAL SEMICONDUCTOR DEVICE AND METHOD OF FABRICATING THE SAME
First Claim
1. A three dimensional (3D) semiconductor memory device comprising:
- a substrate including a cell array region and a connection region;
a stack structure comprising a plurality of electrodes and a plurality of insulating layers vertically and alternately stacked on the substrate, the stack structure having a first staircase structure formed along a first direction on the connection region and a second staircase structure formed along a second direction crossing the first direction on the connection region, andan etch stop layer covering the first and second staircase structures of the stack structure, the etch stop layer comprising an amorphous boron layer;
wherein the first staircase structure comprises a plurality of first stairs, each of the first stairs comprising adjacent two of the electrodes, andwherein the second staircase structure comprises a plurality of second stairs, each of the second stairs comprising one of the electrodes,wherein the first and second directions are parallel to a top surface of the substrate.
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Abstract
Provided is a semiconductor device including a lower layer structure on a substrate, the lower layer structure having different thicknesses on first and second regions of the substrate, the lower layer structure including an electrode layer at a top and an insulating layer thereunder, an etch stop layer on the lower layer structure, an upper layer structure on the etch stop layer, the etch stop layer having an etch selectivity to the upper and lower layer structures, first and second contact plugs filling first and second openings defined in the upper layer structure and the etch stop layer on the first and second regions, respectively, and contacting corresponding electrode layers of the lower layer structure, respectively, such that one of the first and second contact plugs downwardly extends further with respect to a bottom of the etch stop layer than the other one of the first and second contact plugs.
23 Citations
20 Claims
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1. A three dimensional (3D) semiconductor memory device comprising:
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a substrate including a cell array region and a connection region; a stack structure comprising a plurality of electrodes and a plurality of insulating layers vertically and alternately stacked on the substrate, the stack structure having a first staircase structure formed along a first direction on the connection region and a second staircase structure formed along a second direction crossing the first direction on the connection region, and an etch stop layer covering the first and second staircase structures of the stack structure, the etch stop layer comprising an amorphous boron layer; wherein the first staircase structure comprises a plurality of first stairs, each of the first stairs comprising adjacent two of the electrodes, and wherein the second staircase structure comprises a plurality of second stairs, each of the second stairs comprising one of the electrodes, wherein the first and second directions are parallel to a top surface of the substrate. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A three dimensional (3D) semiconductor memory device comprising:
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a substrate including a cell array region and a connection region adjacent to the cell array region in a first direction; a stack structure comprising a plurality of electrodes and a plurality of insulating layers vertically and alternately stacked on the substrate, the stack structure having a staircase structure formed along the first direction on the connection region, the staircase structure comprising a plurality of first stairs, each of the first stairs comprising adjacent two of the electrodes; and an etch stop layer covering sidewalls of the plurality of first stairs, etch stop layer comprising an amorphous boron layer. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19, 20)
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Specification