Semiconductor memory device and method for manufacturing the same
A semiconductor memory device may include: a substrate extending in each of a first direction and a second direction that intersect each other; and storage patterns disposed on the substrate, and spaced apart from each other in each of the first and second directions. Each of the storage patterns extends in a third direction intersecting a plane defined by the first and second directions, and include a face in contact with a respective one from among storage contacts. The face of each of the storage patterns has a first width along the first direction and a second width along the second direction. The first width of the face of the storage patterns increases in a relative manner to each other in the first direction, while spacings in the first direction between adjacent ones of the storage patterns decrease in a relative manner to each other in the first direction.
1 . A semiconductor memory device comprising:
a substrate extending in each of a first direction and a second direction that intersect each other; and
a plurality of storage patterns disposed on the substrate, and spaced apart from each other in each of the first direction and the second direction, wherein each of the plurality of storage patterns extends in a third direction intersecting a plane defined by the first direction and the second direction, and each of the plurality of storage patterns comprises a first face in contact with a respective one from among a plurality of storage contacts,
wherein the first face of each of the plurality of storage patterns has a first width along the first direction and a second width along the second direction,
wherein the first width of the first face of each of the plurality of storage patterns increases in a relative manner to each other in the first direction, while spacings in the first direction between adjacent ones of the plurality of storage patterns decrease in a relative manner to each other in the first direction, and
wherein the first direction is unidirectional, and the second direction is unidirectional.
2 . The semiconductor memory device of claim 1 , wherein the second width of the first face of each of the plurality of storage patterns increases in a relative manner to each other in the second direction.
3 . The semiconductor memory device of claim 1 , wherein areas of the first face of each of the plurality of storage patterns increases in a relative manner to each other in the first direction.
4 . The semiconductor memory device of claim 3 , wherein the areas of the first face of each of the plurality of storage patterns increase in a relative manner to each other in the second direction.
5 . The semiconductor memory device of claim 1 , wherein the substrate comprises a cell area, on which a memory cell array is disposed, and a peripheral area around the cell area,
wherein the first width of the first face of each of the plurality of storage patterns increases in a relative manner to each other as the plurality of storage patterns are closer to the peripheral area.
6 . The semiconductor memory device of claim 5 , wherein the second width of the first face of each of the plurality of storage patterns increases in a relative manner to each other as the plurality of storage patterns are closer to the peripheral area.
7 . The semiconductor memory device of claim 5 , wherein areas of the first face of each of the plurality of storage patterns increase in a relative manner to each other as the plurality of storage patterns are closer to the peripheral area.
8 . The semiconductor memory device of claim 1 , wherein each of the plurality of storage patterns further comprises a second face opposite to the first face, and a sidewall connecting the first face and the second face to each other and extending in the third direction,
wherein the semiconductor memory device further comprises a support pattern in contact with the sidewall of each of the plurality of storage patterns so as to support each of the plurality of storage patterns.
9 . The semiconductor memory device of claim 1 , wherein each of the plurality of storage patterns comprises a lower electrode, a capacitor dielectric film on the lower electrode, and an upper electrode on the capacitor dielectric film.
10 . A semiconductor memory device comprising:
a substrate comprising a cell area on which a memory cell array is disposed, and a peripheral area disposed around the cell area, wherein the substrate extends in each of a first direction and a second direction that intersect each other; and
a plurality of storage patterns disposed on the substrate, and extending in a third direction intersecting a plane defined by the first direction and the second direction, wherein the plurality of storage patterns are respectively connected to a plurality of storage contacts,
wherein the plurality of storage patterns comprises a first storage pattern adjacent to the cell area, a second storage pattern adjacent to the peripheral area, and a third storage pattern between the first storage pattern and the second storage pattern,
wherein a width of the first storage pattern along the first direction, a width of the second storage pattern along the first direction, and a width of the third storage pattern along the first direction gradually increase in a relative manner to each other as the plurality of storage patterns are closer to the peripheral area,
wherein a spacing in the first direction between the second storage pattern and the third storage pattern is smaller than a spacing in the first direction between the first storage pattern and the third storage pattern, and
wherein the first direction is unidirectional, and the second direction is unidirectional.
11 . The semiconductor memory device of claim 10 , wherein a width of the first storage pattern along the second direction, a width of the second storage pattern along the second direction, and a width of the third storage pattern along the second direction gradually increase or decrease in a relative manner to each other as the plurality of storage patterns are closer to the peripheral area.
12 . The semiconductor memory device of claim 10 , wherein a spacing in the second direction between the second storage pattern and the third storage pattern is smaller than a spacing in the second direction between the first storage pattern and the third storage pattern.
13 . The semiconductor memory device of claim 10 , wherein the width along the first direction of the first storage pattern is smaller than or equal to 20% of the width along the first direction of the second storage pattern.
14 . The semiconductor memory device of claim 10 , wherein an aspect ratio of the first storage pattern, an aspect ratio of the second storage pattern, and an aspect ratio of the third storage pattern decrease in a relative manner to each other as the plurality of storage patterns are closer to the peripheral area.
15 . The semiconductor memory device of claim 10 , wherein the plurality of storage contacts comprise first to third storage contacts respectively contacting the first storage pattern, the second storage pattern, and the third storage pattern,
wherein widths along the first direction of the first to third storage contacts are equal to each other.