Group III nitride compound semiconductor light-emitting device and method for producing the same
First Claim
1. A Group III nitride compound semiconductor light-emitting device comprising:
- a substrate;
a plurality of Group III nitride compound semiconductor layers comprising a first layer as a top flat surface layer deposited on said substrate through epitaxial growth,a plurality of convex parts which are separated from each other and comprise Group III nitride compound semiconductor formed on said first layer through selective growth from said first layer; and
a light-transparency electrode formed on an exposed portion of said first layer except for said plurality of convex parts.
1 Assignment
0 Petitions
Accused Products
Abstract
In a Group III nitride compound semiconductor light-emitting device which outputs lights from a semiconductor plane, about 1.5 μm in height of a Group III nitride compound semiconductor projection part 150, which is made of Mg-doped p-type GaN having Mg doping concentration of 8×1019/cm3 and is formed through selective growth, is formed on a p-type contact layer (second p-layer) 108. And a light-transparency electrode 110 is formed thereon through metal deposition. The Group III nitride compound semiconductor projection part 150 makes a rugged surface for outputting lights and actual critical angle is widened, which enables to improve luminous outputting efficiency. And because etching is not employed to form the ruggedness, driving voltage does not increase.
68 Citations
20 Claims
-
1. A Group III nitride compound semiconductor light-emitting device comprising:
-
a substrate; a plurality of Group III nitride compound semiconductor layers comprising a first layer as a top flat surface layer deposited on said substrate through epitaxial growth, a plurality of convex parts which are separated from each other and comprise Group III nitride compound semiconductor formed on said first layer through selective growth from said first layer; and a light-transparency electrode formed on an exposed portion of said first layer except for said plurality of convex parts. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
-
-
10. A method for producing a Group III nitride compound semiconductor light-omitting device, comprising:
-
forming an n-type Group III nitride compound semiconductor layer, an emission layer, and a p-type Group III nitride compound layer on a substrate; forming a mask on an uppermost layer of said Group III nitride compound semiconductor layer on which a Group III nitride compound semiconductor does not grow; removing a portion of the mask; selectively growing a Group III nitride compound semiconductor on the exposed portion of said uppermost layer where said mask is partially removed so as to form a plurality of convex parts for outputting lights on the surface of said uppermost layer; removing a remaining portion of said mask; and forming a light-transparency electrode on an exposed portion of said first layer except for said plurality of convex parts. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17)
-
-
18. A method for producing a Group III nitride compound semiconductor light-emitting device, comprising:
-
forming an n-type Group III nitride compound semiconductor layer, an emission layer, and a p-type Group III nitride compound layer on a substrate; forming a light-transparency electrode comprising indium tin oxide (ITO) on an uppermost layer of said Group III nitride compound semiconductor layer on which a Group III nitride compound semiconductor does not grow; removing a portion of said light-transparency electrode; and selectively growing a Group III nitride compound semiconductor on the exposed portion of said uppermost layer where said light-transparency electrode is partially removed so as to form a plurality of convex parts for outputting lights on the surface of said uppermost layer. - View Dependent Claims (19, 20)
-
Specification