Method of producing a single crystal gallium nitride substrate and single crystal gallium nitride substrate
First Claim
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1. A method of making a gallium nitride single crystal substrate comprising the steps of:
- growing a {1−
100} single crystal gallium nitride single ingot on a {1−
100} GaN seed crystal substrate in the <
1−
100>
growing direction;
slicing the {1−
100} GaN single crystal ingot in (0001) planes parallel to the <
1−
100>
growing direction; and
obtaining (0001) GaN single crystal substrates.
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Abstract
GaN single crystal substrates are produced by slicing a GaN single crystal ingot in the planes parallel to the growing direction. Penetration dislocations which have been generated in the growing direction extend mainly in the bulk of the GaN substrate. A few of the threading dislocations appear on the surface of the GaN substrate. GaN substrates of low-dislocation density are obtained.
188 Citations
21 Claims
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1. A method of making a gallium nitride single crystal substrate comprising the steps of:
-
growing a {1−
100} single crystal gallium nitride single ingot on a {1−
100} GaN seed crystal substrate in the <
1−
100>
growing direction;
slicing the {1−
100} GaN single crystal ingot in (0001) planes parallel to the <
1−
100>
growing direction; and
obtaining (0001) GaN single crystal substrates. - View Dependent Claims (2, 3)
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4. A method of making a gallium nitride single crystal substrate comprising:
-
growing the {11−
20} single crystal gallium nitride ingot on a {11−
20} GaN seed crystal substrate in a <
11−
20>
growing direction;
slicing the {11−
20} GaN single crystal ingot in (0001) planes parallel to the <
11−
20>
growing direction; and
obtaining (0001) GaN single crystal substrates. - View Dependent Claims (5, 6)
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7. A method of making gallium nitride single crystal comprising:
-
growing a {0001} single crystal gallium nitride ingot in a {0001} GaN seed crystal substrate in a <
0001>
growing direction;
slicing the {0001} GaN single crystal ingot in {1−
100} planes parallel to the <
0001>
growing direction; and
obtaining {1−
100} GaN single crystal substrates.- View Dependent Claims (8, 9)
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10. A method of making a gallium nitride single crystal substrate comprising:
-
growing the {0001} gallium nitride single crystal ingot on a {0001} GaN seed crystal substrate in the <
0001>
growing direction;
slicing the {0001} GaN single crystal ingot in {11−
20} planes parallel to the <
0001>
growing direction; and
obtaining {11−
20} GaN single crystal substrates.- View Dependent Claims (11, 12)
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- 13. A gallium nitride single crystal substrate having surfaces and containing threading dislocations extending in parallel with the surface, wherein parallelism of the dislocations to the surface reduces the threading dislocations appearing on the surface by hiding almost all of the threading dislocations below the surface and allowing a few of the threading dislocations to appear on the surface.
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14. A gallium nitride single crystal substrate having surfaces and containing threading dislocations extending in parallel with the surface, wherein one direction parallelism of the dislocations to the surface reduces the threading dislocations below the surface and allowing a few of the threading dislocations to appear on the surface.
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16. A method of making a gallium nitride single crystal substrate comprising:
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growing a gallium nitride single crystal ingot in a growing direction;
slicing the GaN single crystal ingot in planes parallel to the growing direction into GaN seed single crystals;
obtaining the GaN seed single crystals having surfaces, a bulk between the surfaces, threading dislocations running within the bulk in a direction parallel to the surface and a few threading dislocations appearing on the surface;
growing a gallium nitride single crystal ingot in a growing direction on the GaN seed crystal;
slicing the GaN single crystal ingot in planes orthogonal to the growing direction into GaN single substrates; and
obtaining the GaN single crystal substrates having surfaces, a bulk between the surfaces and threading dislocations running in a direction orthogonal to the surface. - View Dependent Claims (18, 19, 20, 21)
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17. A method of making a gallium nitride single crystal substrate comprising:
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preparing a GaN seed single crystal having surfaces, a bulk between the surfaces, threading dislocations running within the bulk in a direction parallel to the surface and a few threading dislocations appearing on the surface;
growing a gallium nitride single crystal ingot in a growing direction on the GaN seed single crystal;
slicing the GaN single crystal ingot in planes orthogonal to the growing direction into GaN single substrates; and
obtaining the GaN single crystal substrates having surfaces, a bulk between the surfaces and threading dislocations running in a direction orthogonal to the surface.
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Specification