Source: http://www.google.com/patents/US8044384?dq=7,013,345/
Timestamp: 2014-10-25 21:11:59
Document Index: 675040758

Matched Legal Cases: ['Application No. 10180319', 'Application No. 2007', 'Application No. 10', 'Application No. 10', 'Application No. 10', 'Application No. 09157557']

Patent US8044384 - Group III nitride based quantum well light emitting device structures with ... - Google PatentsSearch Images Maps Play YouTube News Gmail Drive More »Sign inAdvanced Patent SearchPatentsGroup III nitride based light emitting devices and methods of fabricating Group III nitride based light emitting devices are provided. The emitting devices include an n-type Group III nitride layer, a Group III nitride based active region on the n-type Group III nitride layer and comprising at least...http://www.google.com/patents/US8044384?utm_source=gb-gplus-sharePatent US8044384 - Group III nitride based quantum well light emitting device structures with an indium containing capping structureAdvanced Patent SearchPublication numberUS8044384 B2Publication typeGrantApplication numberUS 12/698,658Publication dateOct 25, 2011Filing dateFeb 2, 2010Priority dateMay 30, 2001Also published asCA2441310A1, CN1552104A, CN100350637C, DE60229514D1, DE60231877D1, EP1390990A2, EP1390990B1, EP2075855A2, EP2075855A3, EP2237334A2, EP2259347A2, US6958497, US7312474, US8227268, US8546787, US20030006418, US20050045895, US20080038858, US20100133508, US20120018701, US20120298955, US20130341593, WO2002097904A2, WO2002097904A3Publication number12698658, 698658, US 8044384 B2, US 8044384B2, US-B2-8044384, US8044384 B2, US8044384B2InventorsMichael John Bergmann, David Todd EmersonOriginal AssigneeCree, Inc.Export CitationBiBTeX, EndNote, RefManPatent Citations (102), Non-Patent Citations (16), Referenced by (1), Classifications (24), Legal Events (1) External Links: USPTO, USPTO Assignment, EspacenetGroup III nitride based quantum well light emitting device structures with an indium containing capping structureUS 8044384 B2Abstract Group III nitride based light emitting devices and methods of fabricating Group III nitride based light emitting devices are provided. The emitting devices include an n-type Group III nitride layer, a Group III nitride based active region on the n-type Group III nitride layer and comprising at least one quantum well structure, a Group III nitride layer including indium on the active region, a p-type Group III nitride layer including aluminum on the Group III nitride layer including indium, a first contact on the n-type Group III nitride layer and a second contact on the p-type Group III nitride layer. The Group III nitride layer including indium may also include aluminum.
1. A light emitting diode, comprising
a Group III nitride light emitting diode active region on the n-type Group III nitride layer, wherein the light emitting diode active region provides photon emission due to carrier recombination therein; and
an undoped quaternary Group III nitride capping layer on the light emitting diode active region opposite from the n-type Group III nitride layer, wherein the undoped quaternary Group III nitride capping layer is a distinct layer from the light emitting diode active region and is directly on a binary Group III nitride layer.
3. The light emitting diode of claim 2, wherein the undoped quaternary Group III nitride capping layer comprises indium.
4. The light emitting diode of claim 3, wherein the undoped quaternary Group III nitride capping layer further comprises aluminum.
5. The light emitting diode of claim 4, wherein the undoped quaternary Group III nitride capping layer comprises a layer of undoped indium aluminum gallium nitride (InAlGaN).
6. The light emitting diode of claim 5, wherein the binary Group III nitride layer comprises a gallium nitride (GaN) layer between the light emitting diode active region and the undoped quaternary Group III nitride capping layer.
7. The light emitting diode of claim 6, wherein the GaN layer is undoped.
8. The light emitting diode of claim 5, wherein the undoped InAlGaN layer is continuously graded.
9. The light emitting diode of claim 5, wherein the undoped InAlGaN layer comprises a plurality of undoped InAlGaN sublayers having different aluminum (Al) compositions.
10. The light emitting diode of claim 9, wherein at least one of the plurality of undoped InAlGaN sublayers distal from the light emitting diode active region has an aluminum (Al) composition greater than is present in at least one of the plurality of undoped InAlGaN sublayers proximate the light emitting diode active region.
11. The light emitting diode of claim 10, wherein an Al composition of the ternary p-type Group III nitride layer is less than that of one of the plurality of InAlGaN sublayers directly thereon.
12. The light emitting diode of claim 2, wherein the quaternary Group III nitride capping layer provides a transition from a lattice structure of the light emitting diode active region to a lattice structure of the ternary p-type layer thereon.
13. The light emitting diode of claim 12, wherein the quaternary Group III nitride capping layer does not provide photon emission due to carrier recombination therein.
14. The light emitting diode of claim 2, further comprising:
a binary p-type Group III nitride layer on the ternary p-type Group III nitride layer opposite the undoped quaternary Group III nitride capping layer; and
a second contact on the binary p-type Group III nitride layer opposite the ternary p-type Group III nitride layer.
15. The light emitting diode of claim 14, wherein the ternary p-type Group III nitride layer comprises a p-type AlGaN layer directly on the undoped quaternary Group III nitride capping layer, and wherein the binary p-type Group III nitride layer comprises a p-type GaN layer.
16. The light emitting diode of claim 1, wherein the light emitting diode active region comprises a multi-quantum well structure including alternating indium gallium nitride (InGaN)/gallium nitride (GaN) layers, and wherein the binary Group III nitride layer comprises a GaN layer of the multi-quantum well structure.
17. The light emitting diode of claim 1, wherein the light emitting diode active region comprises a multi-quantum well structure including alternating quantum well layers and quaternary barrier layers.
18. The light emitting diode of claim 17, wherein the undoped quaternary Group III nitride capping layer has a higher bandgap than at least one quantum well layer of the light emitting diode active region.
an undoped quaternary Group III nitride capping layer on the light emitting diode active region opposite from the n-type Group III nitride layer, wherein the undoped quaternary Group III nitride capping layer is a distinct layer from the active region and comprises:
a first layer of InxAlyGa1-x-yN, where 0<x≦0.2 and 0≦y≦0.4; and
a second layer of InwAlzGa1-w-zN, where 0<w≦0.2 and y≦z<1.
a Group III nitride light emitting diode active region on the n-type Group III nitride layer, the light emitting diode active region comprising a multi-quantum well structure including alternating quantum well layers and quaternary barrier layers; and
a quaternary Group III nitride capping layer on the light emitting diode active region opposite from the n-type Group III nitride layer, wherein the quaternary Group III nitride capping layer is a distinct layer from the light emitting diode active region and is directly on a quaternary barrier layer of the light emitting diode active region.
21. The light emitting diode of claim 20, further comprising:
a ternary p-type Group III nitride layer directly on the quaternary Group III nitride capping layer and remote from the light emitting diode active region.
a Group III nitride light emitting diode active region on the n-type Group III nitride layer, the light emitting diode active region comprising a multi-quantum well structure including alternating quantum well layers and quaternary barrier layers;
a quaternary Group III nitride capping layer on the light emitting diode active region opposite from the n-type Group III nitride layer; and
a binary Group III nitride layer between the light emitting diode active region and the quaternary Group III nitride capping layer,
wherein the quaternary Group III nitride capping layer is directly on the binary Group III nitride layer.
23. The light emitting diode of claim 22, wherein the quaternary Group III nitride capping layer is undoped, and wherein the binary Group III nitride layer comprises an undoped GaN layer.
24. A light emitting diode, comprising:
a Group III nitride light emitting diode active region on the n-type Group III nitride layer, the light emitting diode active region comprising a multi-quantum well structure including alternating quantum well layers and quaternary barrier layers, wherein the quantum well layers comprise indium gallium nitride (InGaN), wherein the quaternary barrier layers comprise aluminum indium gallium nitride (AlInGaN), and wherein an indium (In) composition of the barrier layers is less than that of the quantum well layers; and
a quaternary Group III nitride capping layer on the light emitting diode active region opposite from the n-type Group III nitride layer.
25. The light emitting diode of claim 24, wherein the quaternary Group III nitride capping layer comprises a barrier layer of the light emitting diode active region.
26. The light emitting diode of claim 24, wherein the at least one quantum well structure comprises an indium gallium nitride (InGaN) quantum well layer and an aluminum indium gallium nitride (AlInGaN) barrier layer, and wherein an indium (In) composition of the barrier layer is less than that of the quantum well layer.
27. A light emitting diode, comprising
a Group III nitride light emitting diode active region on the n-type Group III nitride layer, the light emitting diode active region comprising at least one quantum well structure; and
an undoped quaternary Group III nitride capping layer on the light emitting diode active region opposite from the n-type Group III nitride layer, wherein the undoped quaternary Group III nitride capping layer has a higher bandgap than the at least one quantum well structure of the light emitting diode active region and wherein the undoped quaternary Group III nitride capping layer is directly on a binary Group III nitride layer.
28. A light emitting diode, comprising:
a Group III nitride based superlattice on the n-type Group III nitride layer, the superlattice having at least two periods of alternating layers;
a Group III nitride based light emitting diode active region on the superlattice opposite the n-type Group III nitride layer, wherein the light emitting diode active region provides photon emission due to carrier recombination therein; and
a Group III nitride capping layer including aluminum (Al) on the light emitting diode active region, the Group III nitride capping layer having a higher Al composition in a region distal from the light emitting diode active region than is present in a region proximate the light emitting diode active region.
29. The light emitting diode of claim 28, wherein the Group III nitride capping layer is undoped.
30. The light emitting diode of claim 28, further comprising:
a p-type Group III nitride layer directly on the Group III nitride capping layer and remote from the active region.
31. The light emitting diode of claim 30, wherein the p-type Group III nitride layer includes aluminum (Al), and wherein an Al composition of the p-type Group III nitride layer is less than that of the region of the Group III nitride capping layer distal from the light emitting diode active region.
32. The light emitting diode of claim 28, wherein the Al composition of the Group III nitride capping layer is continuously graded.
33. The light emitting diode of claim 28, wherein the Al composition of the Group III nitride capping layer is graded in a stepwise fashion.
34. The light emitting diode of claim 28, further comprising:
a gallium nitride (GaN) layer between the active region and the Group III nitride capping layer.
35. A light emitting diode, comprising
a Group III nitride light emitting diode active region on the n-type Group III nitride layer, the light emitting diode active region comprising at least one quantum well layer and at least one barrier layer; and
an undoped quaternary Group III nitride capping layer on the light emitting diode active region opposite from the n-type Group III nitride layer, wherein the undoped quaternary Group III nitride capping layer is a distinct layer from the light emitting diode active region and is directly on a barrier layer of the light emitting diode active region.
CROSS-REFERENCE TO RELATED APPLICATIONS This application is a continuation of U.S. patent application Ser. No. 10/899,791 filed Jul. 27, 2004 now U.S. Pat. No. 7,692,182 entitled GROUP III NITRIDE BASED QUANTUM WELL LIGHT EMITTING DEVICE STRUCTURES WITH AN INDIUM CONTAINING CAPPING STRUCTURE, which is a continuation-in-part of U.S. patent application Ser. No. 10/140,796 filed May 7, 2002 now U.S. Pat. No. 6,958,497 entitled GROUP III NITRIDE BASED LIGHT EMITTING DIODE STRUCTURES WITH A QUANTUM WELL AND SUPERLATTICE, GROUP III NITRIDE BASED QUANTUM WELL STRUCTURES AND GROUP III NITRIDE BASED SUPERLATTICE STRUCTURES which claims the benefit of, and priority from, Provisional Application Ser. No. 60/294,445, filed May 30, 2001 entitled MULTI-QUANTUM WELL LIGHT EMITTING DIODE STRUCTURE, Provisional Application Ser. No. 60/294,308, filed May 30, 2001 entitled LIGHT EMITTING DIODE STRUCTURE WITH SUPERLATTICE STRUCTURE and Provisional Application Ser. No. 60/294,378, filed May 30, 2001 entitled LIGHT EMITTING DIODE STRUCTURE WITH MULTI-QUANTUM WELL AND SUPERLATTICE STRUCTURE, the disclosures of which are hereby incorporated herein by reference in their entirety as if set forth fully herein. This application is also a continuation-in-part of U.S. patent application Ser. No. 11/875,353, filed Oct. 19, 2007, which is a divisional of U.S. patent application Ser. No. 10/963,666, filed Oct. 13, 2004, which is a divisional of U.S. patent application Ser. No. 10/140,796 filed May 7, 2002, which claims the benefit of, and priority from, Provisional Application Ser. No. 60/294,445, filed May 30, 2001, Provisional Application Ser. No. 60/294,308, filed May 30, 2001, and Provisional Application Ser. No. 60/294,378, filed May 30, 2001.
FILED OF THE INVENTION This invention relates to microelectronic devices and fabrication methods therefor, and more particularly to structures which may be utilized in Group III nitride semiconductor devices, such as light emitting diodes (LEDs).
SUMMARY OF THE INVENTION Some embodiments of the present invention provide Group III nitride based light emitting devices and methods of fabricating Group III nitride based light emitting devices that include an n-type Group III nitride layer, a Group III nitride based active region on the n-type Group III nitride layer and including at least one quantum well structure, a Group III nitride layer including indium on the active region, a p-type Group III nitride layer including aluminum on the Group III nitride layer including indium, a first contact on the n-type Group III nitride layer and a second contact on the p-type Group III nitride layer.
In further embodiments of the present invention, the p-type gallium nitride based layer includes a p-type AlGaN layer on the gallium nitride based layer including indium and a p-type GaN layer on the p-type AlGaN layer. The second contact is on the p-type GaN layer. The gallium nitride based layer including indium may include a first layer of InxAlyGa1-x-yN, where 0<x≦0.2 and 0≦y≦0.4 and a second layer of InwAlzGa1-w-zN, where 0<w≦0.2 and y≦z≦1. The first layer may have a thickness of from about 10 to about 200 Å and the second layer may have a thickness of from about 10 to about 120 Å. In particular embodiments of the present invention, the first layer has a thickness of about 80 Å, x=0.1 and y=0.25 and the second layer has a thickness of about 30 Å, w=0.05 and z=0.55.
DETAILED DESCRIPTION OF EMBODIMENTS The present invention now will be described more fully hereinafter with reference to the accompanying drawings, in which embodiments of the invention are shown. However, this invention should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art. In the drawings, the thickness of layers and regions are exaggerated for clarity. Like numbers refer to like elements throughout. As used herein the term �and/or� includes any and all combinations of one or more of the associated listed items.
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