Method of forming semiconductor multi-layered structure

Abstract

Disclosed herein is a method of forming a single crystal SiC on a Si Substrate wherein a SiGe layer lower in melting point than Si and SiC and an amorphous SiC are formed on the Si layer and this structure is annealed at a temperature higher than the melting point of SiGe to relieve strain between SiC and the Si substrate and to cause an amorphous SiC to crystallize at the same time, thereby forming the single crystal SiC layer good in crystallinity and surface morphology.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

Embodiments of the present invention will be described in detail based on the following figures, wherein:

FIG. 1 is a schematic cross section illustrating a method of producing a semiconductor thin film according to a first embodiment of the present invention;

FIG. 2A is a schematic cross section illustrating a method of producing a semiconductor thin film in the order of steps according to the present invention shown in FIG. 1;

FIG. 2B is a schematic cross section illustrating a method of producing a semiconductor thin film in the order of steps according to the present invention shown in FIG. 1;

FIG. 2C is a schematic cross section illustrating a method of producing a semiconductor thin film in the order of steps according to the present invention shown in FIG. 1;

FIG. 3 is a schematic cross section illustrating a method of producing a semiconductor thin film according to a second embodiment of the present invention;

FIG. 4A is a schematic cross section illustrating a method of producing a semiconductor thin film in the order of steps according to the present invention shown in FIG. 3;

FIG. 4B is a schematic cross section illustrating a method of producing a semiconductor thin film in the order of steps according to the present invention shown in FIG. 3;

FIG. 4C is a schematic cross section illustrating a method of producing a semiconductor thin film in the order of steps according to the present invention shown in FIG. 3;

FIG. 5 is a schematic cross section illustrating a semiconductor device according to a third embodiment of the present invention;

FIG. 6 is a schematic cross section illustrating a semiconductor device according to a fourth embodiment of the present invention;

FIG. 7 is a schematic cross section illustrating a semiconductor device according to a fifth embodiment of the present invention;

FIG. 8 is a schematic cross section illustrating a semiconductor device according to a sixth embodiment of the present invention;

FIG. 9 is a schematic cross section illustrating a semiconductor device according to a seventh embodiment of the present invention; and

FIG. 10 is a schematic cross section illustrating a method of producing a conventional semiconductor thin film.

Claims

1. A method of forming semiconductor multi-layered structure comprising the steps of: forming a first semiconductor thin film on a single crystal substrate, the first semiconductor thin film being lower in melting point than the single crystal substrate and being a single crystal;forming a second semiconductor thin film on the first semiconductor thin film, the second semiconductor thin film including a semiconductor material different in lattice constant from the single crystal substrate and higher in melting point than the first semiconductor thin film; andannealing the second semiconductor thin film at a temperature higher than the melting point of the first semiconductor thin film to turn the second semiconductor thin film into a single crystal.

2. The method of forming semiconductor multi-layered structure according to claim 1, wherein the second semiconductor thin film is amorphous before the annealing step and turned into a single crystal after the annealing step.

3. The method of forming semiconductor multi-layered structure according to claim 1, wherein the first semiconductor thin film is amorphous before being annealed and turned into a single crystal after having been annealed.

4. The method of forming semiconductor multi-layered structure according to claim 2, wherein the first semiconductor thin film is amorphous before being annealed and turned into a single crystal after having been annealed.

5. The method of forming semiconductor multi-layered structure according to claim 1, further comprising the step of forming a third semiconductor thin film on the second semiconductor thin film, the third semiconductor thin film having the same structure as the second semiconductor thin film.

6. The method of forming semiconductor multi-layered structure according to claim 2, further comprising the step of forming a third semiconductor thin film on the second semiconductor thin film, the third semiconductor thin film having the same structure as the second semiconductor thin film.

7. The method of forming semiconductor multi-layered structure according to claim 3, further comprising the step of forming a third semiconductor thin film on the second semiconductor thin film, the third semiconductor thin film having the same structure as the second semiconductor thin film.

8. The method of forming semiconductor multi-layered structure according to claim 1, wherein a thin film including an inorganic material of which characteristics are not varied by annealing at a temperature higher than the melting point of the first semiconductor thin film at the annealing step is provided between the single crystal substrate and the first semiconductor thin film.

9. The method of forming semiconductor multi-layered structure according to claim 2, wherein a thin film including an inorganic material of which characteristics are not varied by annealing at a temperature higher than the melting point of the first semiconductor thin film at the annealing step is provided between the single crystal substrate and the first semiconductor thin film.

10. The method of forming semiconductor multi-layered structure according to claim 3, wherein a thin film including an inorganic material of which characteristics are not varied by annealing at a temperature higher than the melting point of the first semiconductor thin film at the annealing step is provided between the single crystal substrate and the first semiconductor thin film.

11. The method of forming semiconductor multi-layered structure according to claim 4, wherein a thin film including an inorganic material of which characteristics are not varied by annealing at a temperature higher than the melting point of the first semiconductor thin film at the annealing step is provided between the single crystal substrate and the first semiconductor thin film.

12. The method of forming semiconductor multi-layered structure according to claim 1, wherein the single crystal substrate includes single crystal silicon (Si).

13. The method of forming semiconductor multi-layered structure according to claim 1, wherein the first semiconductor thin film includes SiGe.

14. The method of forming semiconductor multi-layered structure according to claim 13, wherein the composition ratio of Ge included in the first semiconductor thin film is 30% or more.

15. The method of forming semiconductor multi-layered structure according to claim 1, wherein the second semiconductor thin film includes SiC.

16. The method of forming semiconductor multi-layered structure according to claim 7, wherein the third semiconductor thin film includes SiC.

17. The method of forming semiconductor multi-layered structure according to claim 7, wherein the third semiconductor thin film includes one element of at least Ga, Al and In, and nitrogen.