Semiconductor devices including stacked electrodes

1. A semiconductor device, comprising:

a substrate comprising a cell array region and a connection region;

first and second electrode structures that extend in a first direction on the substrate and are spaced apart from each other in a second direction that intersects the first direction, each of the first and second electrode structures comprising first and second electrodes vertically and alternatingly stacked on the substrate and comprising a stair-step structure on the connection region;

respective string selection electrodes on the first and second electrode structures, each of the string selection electrodes comprising first and second string selection electrodes that are spaced apart from each other in the second direction by an insulating separation layer;

first connection lines that connect coplanar ones of the first electrodes of the first and second electrode structures; and

second connection lines that connect coplanar ones of the second electrodes of the first and second electrode structures,

wherein each of the first connection lines comprises a line-shaped structure extending in the second direction,

wherein each of the second connection lines comprises a shape different from the line-shaped structure when viewed in a plan view,

wherein each of the first connection lines has a first length in the second direction, and

wherein each of the second connection lines has a second length in the second direction, and the second length is greater than the first length.

2. The semiconductor device of claim 1 , wherein the first and second connection lines are coplanar and are alternatingly and repeatedly disposed in the first direction.

3. The semiconductor device of claim 1 , wherein:

each of the first electrodes comprises a first pad region exposed by the second electrode thereon;

each of the second electrodes comprises a second pad region exposed by the first electrode or the string selection electrode thereon;

when viewed in the plan view, the first pad regions are arranged in the first direction; and

when viewed in the plan view, the second pad regions are arranged in the first direction and are adjacent the first pad regions in the second direction.

4. The semiconductor device of claim 3 , wherein:

each of the second electrodes comprises an electrode portion comprising a first width and a protruding portion protruding from the electrode portion in the first direction and comprising a second width narrower than the first width;

on the connection region, each of the first electrodes comprises an end portion that is exposed by the protruding portion of the second electrode thereon;

the first pad regions are at the end portions of the first electrodes that are exposed by the protruding portions of the second electrodes; and

the second pad regions are at the protruding portions of the second electrodes.

5. The semiconductor device of claim 3 , wherein the first pad regions of the first electrode structure are adjacent the first pad regions of the second electrode structure.

6. The semiconductor device of claim 5 , further comprising:

first contacts connected to the first pad regions, respectively; and

second contacts connected to the second pad regions, respectively,

wherein each of the first connection lines connects some of the first contacts that are adjacent each other in the second direction, and

wherein each of the second connection lines connects some of the second contacts that are adjacent each other in the second direction.

7. The semiconductor device of claim 6 ,

wherein each of the second connection lines comprises:

a first connecting portion extending in the second direction; and

second connecting portions protruding from opposite ends of the first connecting portion in the first direction away from the cell array region, and

wherein the second contacts are connected to the second connecting portions.

8. The semiconductor device of claim 6 ,

wherein each of the second connection lines comprises:

a first connecting portion extending in the second direction; and

second connecting portions protruding from opposite ends of the first connecting portion toward the cell array region, and

wherein the second contacts are connected to the second connecting portions.

9. The semiconductor device of claim 3 , wherein the second pad regions of the first electrode structure are adjacent the second pad regions of the second electrode structure.

10. The semiconductor device of claim 1 , further comprising:

first metal lines connected to some of the first connection lines and some of the second connection lines, respectively; and

second metal lines connected to others of the first connection lines and others of the second connection lines, respectively,

wherein the first metal lines are at a higher level than the first and second connection lines, and

wherein the second metal lines are at a higher level than the first metal lines.

11. The semiconductor device of claim 1 , further comprising:

first vertical pillars on the cell array region to penetrate the first and second electrode structures and the first string selection electrodes on the first and second electrode structures;

second vertical pillars on the cell array region to penetrate the first and second electrode structures and the second string selection electrodes on the first and second electrode structures; and

dummy vertical pillars on the cell array region and between the first and second string selection electrodes, the dummy vertical pillars penetrating the first and second electrode structures.

12. The semiconductor device of claim 11 ,

wherein the first vertical pillars comprise first to fourth subsidiary vertical pillars in a zigzag arrangement in the second direction, and

wherein the second vertical pillars comprise fifth to eighth subsidiary vertical pillars in a zigzag arrangement in the second direction.

13. A semiconductor device, comprising:

a substrate comprising a cell array region and a connection region;

first and second electrode structures that extend in a first direction on the substrate and are spaced apart from each other in a second direction that intersects the first direction, each of the first and second electrode structures comprising first and second electrodes vertically and alternatingly stacked on the substrate and comprising a stair-step structure on the connection region,

wherein each of the first electrodes comprises a first pad region at an end portion thereof and each of the second electrodes comprises a second pad region at an end portion thereof, and

wherein, when viewed in a plan view, the first pad regions are arranged in the first direction and each of the second pad regions is adjacent a corresponding one of the first pad regions in the second direction;

first contacts connected to the first pad regions, respectively;

second contacts connected to the second pad regions, respectively;

first connection lines, each of which connects ones of the first contacts that are adjacent each other in the second direction;

second connection lines, each of which connects ones of the second contacts that are adjacent each other in the second direction;

first metal lines, each of which is connected to ones of the first connection lines in a first group and ones of the second connection lines in the first group, wherein the first metal lines are at a higher level than the first connection lines and the second connection lines; and

second metal lines at a higher level than the first metal lines, wherein each of the second metal lines is connected to ones of the first connection lines in a second group and ones of the second connection lines in the second group.

14. The semiconductor device of claim 13 , wherein:

each of the second electrodes comprises an electrode portion comprising a first width and a protruding portion protruding from the electrode portion in the first direction and comprising a second width narrower than the first width;

the second pad regions are on the protruding portions;

each of the end portions of the first electrodes is exposed by the protruding portion thereon;

the first pad regions are on the end portions of the first electrodes that are exposed by the protruding portions of the second pad regions; and

each of the second pad regions of the second electrodes, except for uppermost ones of the second electrodes, is exposed by the first electrode thereon.

15. The semiconductor device of claim 13 , further comprising a third contact that connects one of the second metal lines to one of the first connection lines or to one of the second connection lines.

16. A semiconductor device comprising:

first and second stacks of electrodes;

a plurality of first connection lines, comprising a first length, that connect inner portions of the first stack of electrodes to inner portions of the second stack of electrodes;

a plurality of second connection lines, comprising a second length longer than the first length, that connect outer portions of the first stack of electrodes to outer portions of the second stack of electrodes; and

first metal lines and second metal lines that overlap the plurality of first connection lines and the plurality of second connection lines, wherein uppermost surfaces of the second metal lines are non-coplanar with uppermost surfaces of the first metal lines.

17. The semiconductor device of claim 16 , further comprising:

first contacts that connect the plurality of first connection lines to the inner portions of the first and second stacks;

second contacts that connect the plurality of second connection lines to the outer portions of the first and second stacks; and

a third contact that connects one of the second metal lines to one of the plurality of first connection lines or to one of the plurality of second connection lines,

wherein each of the first and second stacks comprises a plurality of first electrodes and a plurality of second electrodes,

wherein the inner portions comprise upper surfaces of the plurality of first electrodes, and

wherein the outer portions comprise upper surfaces of the plurality of second electrodes that are non-coplanar with the upper surfaces of the plurality of first electrodes.

18. The semiconductor device of claim 17 , wherein uppermost surfaces of the plurality of first connection lines are coplanar with uppermost surfaces of the plurality of second connection lines.

19. The semiconductor device of claim 16 , wherein each of the first and second stacks comprises first and second stair-step-shaped structures, the semiconductor device further comprising:

first contacts that connect the plurality of first connection lines to the inner portions at a first plurality of levels of the first and second stair-step-shaped structures; and

second contacts that connect the plurality of second connection lines to the outer portions at a second plurality of levels of the first and second stair-step-shaped structures that are non-coplanar with the first plurality of levels, wherein pairs of the first contacts are laterally aligned with respective pairs of the second contacts.

20. The semiconductor device of claim 19 , wherein:

the first metal lines are connected to a first group of the plurality of first connection lines and the plurality of second connection lines;

the second metal lines are connected to a second group of the plurality of first connection lines and the plurality of second connection lines; and

the first and second metal lines overlap the first and second groups, respectively.

21. The semiconductor device of claim 16 , further comprising:

a first pair of contacts that connects a first one of the plurality of first connection lines to the first and second stacks;

a second pair of contacts that connects a second one of the plurality of first connection lines to the first and second stacks; and

a third pair of contacts that connects one of the plurality of second connection lines to the first and second stacks,

wherein the one of the plurality of second connection lines comprises a nearest one of the plurality of second connection lines to the first pair of contacts, and

wherein the first pair of contacts is closer to the second pair of contacts than to the third pair of contacts.