Semiconductor memory device and electronic system including the same

A semiconductor memory device, comprising:

• a peripheral circuit structure including a peripheral circuit element;
• and
• a cell structure on the peripheral circuit structure,
• wherein the cell structure includes:
• a substrate including a cell array region, an extension region, and a pad region;
• a mold structure including a plurality of gate electrodes sequentially stacked on the cell array region and the extension region of the substrate in a stair shape, and a plurality of mold insulating layers stacked alternately with the plurality of gate electrodes;
• a plurality of channel structures on the cell array region of the substrate, the plurality of channel structures intersecting the plurality of gate electrodes and passing through the mold structure;
• a plurality of cell contacts respectively connected to the plurality of gate electrodes on the extension region of the substrate;
• a first interlayer insulating layer on the mold structure and covering the plurality of channel structures and the plurality of cell contacts;
• a through contact on the pad region of the substrate and connected to the peripheral circuit element by passing through the first interlayer insulating layer;
• a plurality of first metal patterns respectively connected to the plurality of channel structures, an upper surface of the plurality of first metal patterns being coplanar with an upper surface of the first interlayer insulating layer;
• a plurality of second metal patterns respectively connected to the plurality of cell contacts, an upper surface of the plurality of second metal patterns being coplanar with the upper surface of the plurality of first metal patterns;
• a third metal pattern connected to the through contact, an upper surface of the third metal pattern being coplanar with the upper surface of the plurality of first metal patterns;
• a first blocking layer extending along the upper surface of the first interlayer insulating layer, the upper surface of the plurality of first metal patterns, the upper surface of the plurality of second metal patterns, and the upper surface of the third metal pattern;
• a second interlayer insulating layer on the first blocking layer;
• a plurality of fourth metal patterns in the second interlayer insulating layer, an upper surface of the plurality of fourth metal patterns being coplanar with an upper surface of the second interlayer insulating layer;
• a plurality of vias below the plurality of fourth metal patterns and connected to the plurality of first metal patterns, the plurality of second metal patterns, and the third metal pattern;
• a second blocking layer on the second interlayer insulating layer;
• a plurality of first dummy vias passing through the first blocking layer, on the pad region of the substrate and the extension region of the substrate and not on the cell array region of the substrate;
• and
• a plurality of second dummy vias passing through the first blocking layer, and
• wherein at least a portion of the plurality of first dummy vias is in the first interlayer insulating layer and in the second interlayer insulating layer.

An electronic system, comprising:

• a main board;
• a semiconductor memory device on the main board;
• and
• a controller electrically connected to the semiconductor memory device on the main board,
• wherein the semiconductor memory device includes:
• a substrate including a cell array region and an extension region;
• a mold structure including a plurality of gate electrodes sequentially stacked on the cell array region and the extension region of the substrate in a stair shape, and a plurality of mold insulating layers stacked alternately with the plurality of gate electrodes;
• a plurality of channel structures on the cell array region of the substrate and intersecting the plurality of gate electrodes by passing through the mold structure;
• a plurality of cell contacts respectively connected to the plurality of gate electrodes on the substrate of the extension region;
• a first interlayer insulating layer on the mold structure and covering the plurality of channel structures and the plurality of cell contacts;
• a plurality of first metal patterns respectively connected to the plurality of channel structures, an upper surface of the plurality of first metal patterns being coplanar with an upper surface of the first interlayer insulating layer;
• a plurality of second metal patterns respectively connected to the plurality of cell contacts, an upper surface of the plurality of second metal patterns being coplanar with the upper surface of the plurality of first metal patterns;
• a first blocking layer extended along the upper surface of the first interlayer insulating layer, the upper surface of the plurality of first metal patterns and the upper surface of the plurality of second metal patterns;
• and
• a plurality of first dummy vias passing through the first blocking layer.