Memory devices including capacitor structures having improved area efficiency
View Patent ↗Semiconductor structures including a plurality of conductive structures having a dielectric material therebetween are disclosed. The thickness of the dielectric material spacing apart the conductive structures may be adjusted to provide optimization of capacitance and voltage threshold. The semiconductor structures may be used as capacitors, for example, in memory devices. Various methods may be used to form such semiconductor structures and capacitors including such semiconductor structures. Memory devices including such capacitors are also disclosed.
1. A semiconductor device, comprising:
a memory array comprising memory cells; and
a peripheral circuit associated with the memory array and including a capacitor, the capacitor comprising conductive structures, each conductive structure of the conductive structures laterally spaced from an adjacent conducive structure of the conductive structures by a dielectric material, wherein each conductive structure of the conductive structures comprises an elongated portion and at least one portion extending perpendicular to the elongated portion, wherein upper surfaces of the elongated portion and the at least one portion extending perpendicular to the elongated portion are substantially coplanar, and wherein each of the elongated portion and the at least one portion extending perpendicular to the elongated portion is planar and vertically oriented with respect to a base material on which the capacitor is located.
2. The semiconductor device of claim 1 , wherein each conductive structure of the conductive structures has a width less than about 65 nm.
3. The semiconductor device of claim 1 , wherein the conductive structures comprise polysilicon, a silicide, or a metal.
4. The semiconductor device of claim 1 , wherein a transverse cross-sectional shape of each conductive structure of the conductive structures is square, rectangular, circular, or triangular.
5. The semiconductor device of claim 1 , wherein the conductive structures extend a height of from about 50 nm to about 180 nm above a substrate of the semiconductor device.
6. The semiconductor device of claim 1 , wherein the conductive structures have an aspect ratio of from about 2:1 to about 8:1.
7. The semiconductor device of claim 1 , wherein each conductive structure of the conductive structures is substantially parallel to an adjacent conductive structure of the conductive structures.
8. The semiconductor device of claim 1 , further comprising an oxide-nitride-oxide material over the conductive structures, wherein the dielectric material is located between adjacent portions of the oxide-nitride-oxide material.
9. The semiconductor device of claim 1 , wherein the dielectric material comprises silicon dioxide, tantalum pentoxide, silicon nitride, hafnium oxide, aluminum oxide, or an air gap.
10. A semiconductor device, comprising:
a memory array comprising memory cells; and
a peripheral circuit associated with the memory array and including a capacitor, the capacitor comprising conductive structures, each conductive structure of the conductive structures laterally spaced from an adjacent conductive structure of the conductive structures by a dielectric material, and each conductive structure of the conductive structures comprising first and second portions that are planar and vertically oriented with respect to a material over which the capacitor is formed, wherein at least one conductive structure is spaced from an adjacent conductive structure a different distance than it is spaced from another adjacent conductive structure.
11. The semiconductor device of claim 10 , wherein each conductive structure of the conductive structures has a width of from about 30 nm to about 40 nm.
12. The semiconductor device of claim 10 , wherein the dielectric material between adjacent conductive structures has a thickness of from about 20 nm to about 30 nm.
13. The semiconductor device of claim 10 , wherein the capacitor comprises a decoupling capacitor or is associated with a charge pump circuit.
14. The semiconductor device of claim 10 , wherein the second portions of each conductive structure comprise multiple portions extending perpendicularly to the first portions of the respective conductive structure, and wherein the second portions are substantially coplanar with the first portions.
15. The semiconductor device of claim 10 , wherein the memory array comprises a NAND memory array.
16. A semiconductor device, comprising:
a memory array comprising memory cells; and
a peripheral circuit associated with the memory array and including a capacitor, the capacitor comprising conductive structures laterally spaced from an adjacent conductive structure of the conductive structures by a dielectric material, and each conductive structure of the conductive structures comprising an L-shaped cross-section in a plane parallel to a base material, wherein the dielectric material comprises silicon dioxide, tantalum pentoxide, hafnium oxide, aluminum oxide, or air.
17. The semiconductor device of claim 16 , wherein the conductive structures overlie the base material.
18. The semiconductor device of claim 16 , wherein the dielectric material comprises silicon dioxide.
19. The semiconductor device of claim 16 , further comprising an oxide-nitride-oxide material over the conductive structures, the dielectric material located between adjacent portions of the oxide-nitride-oxide material.
20. The semiconductor device of claim 19 , wherein the oxide-nitride-oxide material extends above each of the conductive structures by about 20 nm to about 30 nm.
21. The semiconductor device of claim 16 , wherein the capacitor directly overlies and contacts a material comprising tantalum pentoxide or silicon nitride.