Semiconductor devices

1. A semiconductor device comprising:

a first electrode on a substrate;

a second electrode on the substrate;

a dielectric layer structure between the first electrode and the second electrode; and

a crystallization inducing layer between the dielectric layer structure and the first electrode, the crystallization inducing layer including niobium nitride (NbN),

wherein the dielectric layer structure includes

a first dielectric layer including a first dielectric material, and

a second dielectric layer on the first dielectric layer, the second dielectric layer including a second dielectric material,

wherein the first dielectric material includes hafnium oxide having a tetragonal crystal phase, and the first dielectric layer has a thickness that is equal to or greater than about 20 Å, and

wherein the first dielectric layer is on a surface of the crystallization inducing layer, and the surface of the crystallization inducing layer and a surface of the first dielectric layer are in contact with each other.

2. The semiconductor device of claim 1 , wherein the crystallization inducing layer includes a material having a work function that is greater in magnitude than a work function of the first electrode and a work function of the second electrode.

3. The semiconductor device of claim 1 , wherein the second dielectric material includes at least one material of zirconium oxide, aluminum oxide, silicon oxide, titanium oxide, yttrium oxide, scandium oxide, or lanthanide oxide.

4. The semiconductor device of claim 1 , wherein the thickness of the first dielectric layer is equal to or greater than about 40% of a thickness of the dielectric layer structure.

5. The semiconductor device of claim 1 , wherein the dielectric layer structure is configured to exhibit a peak radiation emission of 30.48°±0.2° by a {101} plane of a tetragonal crystal structure of the first dielectric layer based on being subjected to an X-ray diffraction analysis.

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

a second crystallization inducing layer between the second electrode and the dielectric layer structure.

7. The semiconductor device of claim 6 , wherein

the second dielectric layer is in contact with the second crystallization inducing layer, and

the second dielectric layer has a dielectric constant that is smaller than a dielectric constant of the first dielectric layer.

8. The semiconductor device of claim 1 , wherein the dielectric layer structure has a dielectric constant of about 40 to about 60.

9. A semiconductor device comprising:

a contact structure on a substrate; and

a capacitor structure on the contact structure,

wherein the capacitor structure includes

a lower electrode electrically connected to the contact structure,

a dielectric layer structure on the lower electrode, the dielectric layer structure including

a first dielectric layer including a first dielectric material, and

a second dielectric layer on the first dielectric layer, the second dielectric layer including a second dielectric material,

an upper electrode on the dielectric layer structure, and

a crystallization inducing layer between the lower electrode and the first dielectric layer, the crystallization inducing layer including a metal material, the metal material having a work function that is greater than a work function of titanium nitride,

wherein the first dielectric layer is on a surface of the crystallization inducing layer, and the surface of the crystallization inducing layer and a surface of the first dielectric layer are in contact with each other,

wherein the first dielectric material includes hafnium oxide having a tetragonal crystal phase, and the first dielectric layer has a thickness that is equal to or greater than about 20 Å, and

wherein the crystallization inducing layer includes niobium nitride.

10. The semiconductor device of claim 9 , wherein the second dielectric layer has a dielectric constant that is smaller than a dielectric constant of the first dielectric layer.

11. The semiconductor device of claim 9 , wherein the dielectric layer structure is configured to exhibit a peak radiation emission of 30.48°±0.2° by a {101} plane of a tetragonal crystal structure of the first dielectric layer based on being subjected to an X-ray diffraction analysis.