Atomic hydrogen as a surfactant in production of highly strained InGaAs, InGaAsN, InGaAsNSb, and/or GaAsNSb quantum wells
View Patent ↗Atomic hydrogen flux impinging on the surface of a growing layer of III-V compounds during VCSEL processing can prevent three-dimensional growth and related misfit dislocations. Use of hydrogen during semiconductor processing can allow, for example, more indium in InGaAs quantum wells grown on GaAs. Atomic hydrogen use can also promote good quality growth at lower temperatures, which makes nitrogen incorporated in a non-segregated fashion producing better material. Quantum wells and associated barriers layers can be grown to include nitrogen (N), aluminum (Al), antimony (Sb), and/or indium (In) placed within or about a typical GaAs substrate to achieve long wavelength VCSEL performance, e.g., within the 1260 to 1650 nm range.
1. Method of processing a vertical cavity surface emitting laser using molecular beam epitaxy (MBE), comprising:
placing a GaAs wafer into a controlled environment;
promoting growth of strained semiconductor layers in at least one quantum well associated with a VCSEL by providing sources of at least In, Ga, and As in order to form a growing surface comprising said at least In, Ga, and As; and
providing atomic hydrogen on said growing surface as a surfactant in order to yield a flatter surface.
2. The method of claim 1 , wherein said controlled environment includes a temperature up to 450° C.
3. The method of claim 1 , further Comprising providing as source of nitrogen.
4. The method of claim 1 , further comprising providing a source of aluminum.
5. The method of claim 1 , further comprising providing a source of antinomy.
6. The method of claim 1 , further comprising providing a source of nitrogen and a source of antinomy.
7. The method of claim 1 , further comprising providing a source of nitrogen and aluminum.
8. The method of claim 1 , said atomic hydrogen surfactant preventing island growth on said growing surface.
9. The method of claim 8 , said atomic hydrogen surfactant preventing formation of significant steps en said growing surface.
10. The method of claim 1 , further comprising providing nitrogen in order for said growing surface to include nitrogen in addition to said at least In, Ga, and As.
11. The method of claim 10 , said nitrogen and atomic hydrogen surfactant being provided by a combined source.
12. Method of processing a vertical cavity surface emitting laser using molecular beam epitaxy (MBE), comprising:
placing a GaAs wafer into a controller environment;
promoting growth of strained semiconductor layers in at least one quantum well associated with a VCSEL by providing sources of; In, Ga, As; and nitrogen in order to form a growing surface comprising said In, Ga, As, and nitrogen;
beaming atomic hydrogen so as to impinge said growing surface as a surfactant in order to yield a flatter surface.
13. The method of claim 12 , wherein said controlled environment includes a temperature up to 450° C.
14. The method of claim 12 , said atomic hydrogen surfactant preventing island growth on said growing surface.
15. The method of claim 14 , said atomic hydrogen surfactant preventing formation of significant steps on said growing surface.
16. Method of processing a vertical cavity surface emitting laser using molecular beam epitaxy (MBE), comprising:
placing a GaAs wafer into a controlled environment;
promoting growth of strained semiconductor layers in at least one quantum well associates with a semiconductor laser by providing sources of at least one of In, As and nitrogen in order to form a growing surface comprising said at least one of In, As, and nitrogen; and
providing atomic hydrogen as a surfactant on said growing surface as a surfacant in order to yield a flatter surface.
17. The method of claim 16 , said atomic hydrogen surfactant preventing island growth on said growing surface.
18. The method of claim 16 , said nitrogen and atomic hydrogen surfactant being provided by a combined source.
19. Method of processing a vertical cavity surface emitting laser using molecular beam epitaxy (MBE), comprising:
placing a wafer comprising Ga into a controlled environment;
promoting growth of strained semiconductor layers in at least one quantum wells associated with a VCSEL by providing sources of at least In, Ga, and As in order to form a growing surface comprising said at least In, Ga, and As; and
providing atomic hydrogen on said growing surface as a surfactant in order to yield a flatter surface.
20. The method of claim 19 , said atomic hydrogen surfacant preventing island growth on said growing surface.