Patent ID: 9613975
Date: 2017-04-04
CPC Classifications: H01L

Claim:
1. A monolithic three-dimensional memory device comprising: a stack of alternating layers comprising insulating layers and electrically conductive layers and located over a substrate; a plurality of memory stack structures extending through the stack; at least one bridge line structure contacting top surfaces of a respective subset of the plurality of memory stack structures; an array of bit line structures overlying the at least one bridge line structure; at least one first contact via structure contacting a respective bit line structure within the array of bit line structures and contacting a respective bridge line structure; and second contact via structures contacting a respective bit line structure within the array of bit line structures and contacting a respective memory stack structure, wherein the monolithic three-dimensional memory device has at least one feature selected from: a first feature that each bottom surface of the at least one first contact via structure is located above a horizontal plane including top surfaces of the plurality of memory stack structures; a second feature that a height of the second contact via structures is the same as a sum of a height of the at least one bridge line structure and a height of the at least one first contact via structure; a third feature that each of the at least one first contact via structure and the at least one second contact via structure comprises a conductive metallic liner having a first metallic composition and a conductive fill material portion having a second metallic composition, and the at least one first contact via structure and the at least one second contact via structure are elongated along a lengthwise direction of the bit line structures within the array of bit line structures; or a fourth feature that the monolithic three-dimensional memory device further comprises a backside contact via structure extending through the stack and contacting a portion of the substrate, wherein the at least one bridge line structure straddles the backside contact via structure without contacting the backside contact via structure.