Technique for the growth and fabrication of semipolar (Ga,Al,In,B)N thin films, heterostructures, and devices

Patent metadata

Field	Value
Publication number	US-9231376-B2
Application number	US-201414229674-A
Country	US
Kind code	B2
Filing date	Mar 28, 2014
Priority date	May 10, 2004
Publication date	Jan 5, 2016
Grant date	Jan 5, 2016

Abstract

A method for growth and fabrication of semipolar (Ga,Al,In,B)N thin films, heterostructures, and devices, comprising identifying desired material properties for a particular device application, selecting a semipolar growth orientation based on the desired material properties, selecting a suitable substrate for growth of the selected semipolar growth orientation, growing a planar semipolar (Ga,Al,In,B)N template or nucleation layer on the substrate, and growing the semipolar (Ga,Al,In,B)N thin films, heterostructures or devices on the planar semipolar (Ga,Al,In,B)N template or nucleation layer. The method results in a large area of the semipolar (Ga,Al,In,B)N thin films, heterostructures, and devices being parallel to the substrate surface.

First claim

What is claimed is:

1. A light emitting device configured as a laser device, comprising:
a semipolar III-nitride film including a light emitting device structure, wherein:
the light emitting device structure includes one or more semipolar III-nitride active layers grown on or above a semipolar surface of a substrate comprising a free-standing gallium nitride (GaN) substrate, the semipolar surface having a {20-21} orientation or off-cut thereof, and
one or more material properties of the semipolar III-nitride active layers are such that the device has an output power of at least 1.5 milliwatts at 250 milliamps drive current; and

an edge configured on the light emitting device structure for emission of electromagnetic radiation.

2. The device of claim 1 , wherein the semipolar III-nitride film comprises a gallium and nitrogen material.

3. The device of claim 1 , wherein the device structure comprises a green light emitting semipolar diode.

4. The device of claim 1 , wherein the substrate is grown on a foreign material.

5. The device of claim 1 , wherein the semipolar III-nitride active layers form a heterostructure.

6. The device of claim 1 , wherein the semipolar III-nitride active layers emit light with reduced blue-shift in a blue emission peak with increasing drive current density between at least 33 Amps per centimeter square and at least 222 Amps per centimeter square, as compared to polar III-nitride active layers operating in similar wavelength and drive current density ranges.

7. The device of claim 1 , wherein the semipolar III-nitride active layers emit light with a reduced decrease in the external quantum efficiency (EQE) with increasing drive current density, as compared to polar III-nitride active layers operating in similar wavelength and drive current density ranges.

8. The device of claim 1 , wherein the semipolar III-nitride active layers have reduced polarization effects and effective hole masses, as compared to polar III-nitride active layers operating in similar wavelength and drive current density ranges.

9. The device of claim 1 , wherein the device structure comprises a blue light emitting semipolar diode.

10. The device of claim 1 , wherein a top surface of the semipolar III-nitride active layers is planar, semipolar, and substantially parallel to a main surface of the substrate.

11. A method for fabricating a laser device, comprising:
growing a semipolar III-nitride film including a light emitting laser device structure, wherein:
the light emitting laser device structure includes one or more semipolar III-nitride active layers grown on or above a surface of a nitride substrate comprising a free-standing gallium nitride (GaN) substrate having a {20-21} surface orientation or off-cut thereof, and
the semipolar III-nitride active layers have one or more material properties such that the device has an output power of at least 1.5 milliwatts at 250 milliamps drive current; and

forming an edge on the laser device structure for emission of electromagnetic radiation.

12. The method of claim 11 , wherein the light emitting device structure comprises a green light emitting semipolar diode.

13. The method of claim 11 , wherein the nitride substrate is grown using MOCVD on a foreign material.

14. The method of claim 11 , wherein the semipolar III-nitride active layers form a heterostructure.

15. The method of claim 11 , wherein the semipolar III-nitride active layers emit light with a reduced blue-shift in a blue emission peak with increasing drive current density between at least 33 Amps per centimeter square and at least 222 Amps per centimeter square, as compared to polar III-nitride active layers operating in similar wavelength and drive current density ranges.

16. The method of claim 11 , wherein the semipolar III-nitride active layers emit light with a reduced decrease in the external quantum efficiency (EQE) with increasing drive current density, as compared to polar III-nitride active layers operating in similar wavelength and drive current density ranges.

17. The method of claim 11 , wherein the semipolar III-nitride active layers have reduced polarization effects and effective hole masses, as compared to polar III-nitride active layers operating in similar wavelength and drive current density ranges.

18. The method of claim 11 , wherein the light emitting device structure comprises a blue light emitting semipolar diode.

19. The method of claim 11 , wherein:
a top surface of the semipolar III-nitride active layers is planar, semipolar, and substantially parallel to a semipolar surface of the nitride substrate comprising a nitride template layer, and
the top surface has a surface area of at least 300 micrometers by 300 micrometers.

20. The method of claim 11 , wherein the semipolar III-nitride active layers are grown on or above a semipolar surface of a gallium nitride (GaN) template having a thickness of at least 10 micrometers.

21. A light emitting device configured as a laser device, comprising:
a semipolar III-nitride film including a light emitting device structure, wherein:
the light emitting device structure includes one or more semipolar III-nitride active layers grown on or above a surface of a substrate, and
one or more material properties of the semipolar III-nitride active layers are such that the device has an output power of at least 1.5 milliwatts at 250 milliamps drive current; and

an edge configured on the light emitting device structure for emission of electromagnetic radiation;
wherein the semipolar III-nitride active layers emit light with reduced blue-shift in a blue emission peak with increasing drive current density between at least 33 Amps per centimeter square and at least 222 Amps per centimeter square, as compared to polar III-nitride active layers operating in similar wavelength and drive current density ranges.

22. The device of claim 21 , wherein the semipolar III-nitride film comprises a gallium and nitrogen material.

23. The device of claim 21 , wherein the semipolar III-nitride active layers are grown on or above a semipolar surface of the substrate comprising a free-standing gallium nitride (GaN) substrate, the semipolar surface having a {20-21} orientation or offcut thereof.

24. The device of claim 21 , wherein the substrate is grown on a foreign material.

25. The device of claim 21 , wherein the semipolar III-nitride active layers form a heterostructure.

26. The device of claim 21 , wherein the semipolar III-nitride active layers emit light with a reduced decrease in the external quantum efficiency (EQE) with increasing drive current density, as compared to polar III-nitride active layers operating in similar wavelength and drive current density ranges.

27. The device of claim 21 , wherein the semipolar III-nitride active layers have reduced polarization effects and effective hole masses, as compared to polar III-nitride active layers operating in similar wavelength and drive current density ranges.

28. The device of claim 21 , wherein a top surface of the semipolar III-nitride active layers is planar, semipolar, and substantially parallel to a main surface of the substrate.

29. A method for fabricating a laser device, comprising:
growing a semipolar III-nitride film including a light emitting laser device structure, wherein:
the light emitting laser device structur

Assignees

• Univ California
• Japan Science & Tech Agency

Inventors

• Farrell Jr Robert M
• Baker Troy J
• Chakraborty Arpan
• Haskell Benjamin A
• Pattison P Morgan
• Sharma Rajat
• Mishra Umesh K
• Denbaars Steven P
• Speck James S
• Nakamura Shuji

Classifications

• H10P14/2908

  Nitrides · CPC title

• H10P14/3466

  Crystal orientation · CPC title

• H10P14/3416

  Nitrides · CPC title

• H10P14/3216

  Nitrides · CPC title

• H10P14/2926

  Crystal orientations · CPC title