MULTIHEIGHT ELECTRICALLY CONDUCTIVE VIA CONTACTS FOR A MULTILEVEL INTERCONNECT STRUCTURE
First Claim
1. A method of making multi-level contacts, comprising:
- providing an in-process multilevel device comprising a device region and a contact region comprising a stack of plurality of alternating sacrificial layers and insulating layers located over a major surface of a substrate;
providing a first contact mask with at least one first contact mask opening and at least one first terrace mask opening over the stack, wherein the at least one first terrace mask opening is larger than the at least one first contact mask opening;
simultaneously forming at least one first contact opening and at least one first terrace opening extending substantially perpendicular to the major surface of the substrate through the stack to a first sacrificial layer by etching a portion of the stack through the at least one first contact mask opening and the at least one first terrace mask opening; and
depositing a first electrically conductive via contact in the at least one first contact opening.
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Accused Products
Abstract
A method of making multi-level contacts includes providing an in-process multilevel device having a device region and a contact region including a stack of a plurality of alternating sacrificial layers and insulator layers located over a major surface of a substrate. A contact mask with at least one contact mask opening and at least one first terrace mask opening is provided over the stack, where the at least one first terrace mask opening is larger than the at least one contact mask opening. At least one first contact opening and at least one first terrace opening are simultaneously formed extending substantially perpendicular to the major surface of the substrate through the stack to a first sacrificial layer by etching a portion of the stack through the at least one contact mask opening and the at least one first terrace mask opening. A first electrically conductive via contact is deposited in the at least one first contact opening.
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Citations
14 Claims
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1. A method of making multi-level contacts, comprising:
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providing an in-process multilevel device comprising a device region and a contact region comprising a stack of plurality of alternating sacrificial layers and insulating layers located over a major surface of a substrate; providing a first contact mask with at least one first contact mask opening and at least one first terrace mask opening over the stack, wherein the at least one first terrace mask opening is larger than the at least one first contact mask opening; simultaneously forming at least one first contact opening and at least one first terrace opening extending substantially perpendicular to the major surface of the substrate through the stack to a first sacrificial layer by etching a portion of the stack through the at least one first contact mask opening and the at least one first terrace mask opening; and depositing a first electrically conductive via contact in the at least one first contact opening. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A three-dimensional NAND device, comprising:
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a substrate having a major surface; a stack of plurality of alternating word lines and insulating layers located over the major surface of the substrate and extending substantially parallel to the major surface of the substrate, wherein the plurality of word lines comprise at least a first word line located in a first device level and a second word line located in a second device level located over the major surface of the substrate and below the first device level; a semiconductor channel, at least one end portion of the semiconductor channel extending substantially perpendicular to the major surface of the substrate through the stack; at least one charge storage region located adjacent to the semiconductor channel; a first plurality of electrically conductive via contacts extending substantially perpendicular to the major surface of the substrate, wherein each of the first plurality of electrically conductive via contacts extends through the stack to contact an upper surface of a respective one of the plurality of word lines in a first set of word lines; an insulating liner located around each of the first plurality of electrically conductive via contacts, wherein the insulating liner isolates each of the first plurality of electrically conductive via contacts from all the word lines in the stack through which each electrically conductive via contact extends, except a respective one of the plurality of word lines whose upper surface is contacted by the respective electrically conductive via contact; a terraced region in the stack comprising end portions of a second set of word lines arranged in a stepped configuration in which underlying word lines extend past overlying word lines in a direction parallel to the major surface of the substrate; an insulating layer located above the terraced region in the stack; and a second plurality of electrically conductive via contacts extending substantially perpendicular to the major surface of the substrate, wherein each of the second plurality of electrically conductive via contacts extends through the insulating layer to contact an upper surface of a respective one of the second set of word lines. - View Dependent Claims (13, 14)
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Specification