DRAM device and method of manufacturing the same
First Claim
1. A method of manufacturing a dynamic random access memory (DRAM) device, comprising:
- forming a multiple tunnel junction (MTJ) structure including conductive patterns and nonconductive patterns alternately stacked on each other, the nonconductive patterns having a band gap larger than a band gap of the conductive patterns;
forming a first insulation layer along a sidewall of the MTJ structure;
forming a gate electrode on the first insulation layer;
forming a word line electrically connected with the MTJ structure;
forming a bit line electrically connected with one of a top surface and a bottom surface of the MTJ structure; and
forming a capacitor electrically connected with one of a top surface and a bottom surface of the MTJ structure that is not connected with the bit line.
1 Assignment
0 Petitions
Accused Products
Abstract
In a DRAM device and a method of manufacturing the same, a multiple tunnel junction (MTJ) structure is provided, which includes conductive patterns and nonconductive patterns alternately stacked on each other. The nonconductive patterns have a band gap larger than a band gap of the conductive patterns. A gate insulation layer and a gate electrode are formed on a sidewall of the MTJ structure. A word line is connected with the MTJ structure, and a bit line is connected with one of top and bottom surfaces of the MTJ structure. A capacitor is connected with one of top and bottom surfaces of the MTJ structure that is not connected with the bit line. Current leakage in the DRAM device is reduced and a unit cells may be vertically stacked on the substrate, so a smaller surface area of the substrate is required for the DRAM device.
10 Citations
11 Claims
-
1. A method of manufacturing a dynamic random access memory (DRAM) device, comprising:
-
forming a multiple tunnel junction (MTJ) structure including conductive patterns and nonconductive patterns alternately stacked on each other, the nonconductive patterns having a band gap larger than a band gap of the conductive patterns; forming a first insulation layer along a sidewall of the MTJ structure; forming a gate electrode on the first insulation layer; forming a word line electrically connected with the MTJ structure; forming a bit line electrically connected with one of a top surface and a bottom surface of the MTJ structure; and forming a capacitor electrically connected with one of a top surface and a bottom surface of the MTJ structure that is not connected with the bit line. - View Dependent Claims (2)
-
-
3. A method of manufacturing a random dynamic access memory (DRAM) device, comprising:
-
forming a preliminary storage electrode on a substrate having a line shape extending in a first direction; forming a preliminary multiple tunnel junction (MTJ) structure on the preliminary storage electrode, the MTJ structure including conductive layers and nonconductive layers alternately stacked on each other, the nonconductive layers having a band gap larger than a band gap of each conductive layers; forming a conductive layer on the preliminary MTJ structure; partially etching the conductive layer, the preliminary MTJ structure and the preliminary storage electrode in a second direction perpendicular to the first direction until a top surface of the substrate is exposed, thereby forming a bit line extending in the second direction and a plurality of MTJ structures and storage electrodes isolated from each other; forming a first dielectric layer on a sidewall of the storage electrodes; forming a plate electrode between adjacent storage electrodes so that a sidewall of the plate electrode contacts with the first dielectric layer; forming an insulation layer on a top surface of the plate electrode, a sidewall of the MTJ structure and a top surface of the bit line; and forming a word line on the insulation layer in the second direction, the word line facing the sidewall of the MTJ structure. - View Dependent Claims (4, 5, 6, 7, 8, 9, 10, 11)
-
Specification