Journal
PHYSICA STATUS SOLIDI B-BASIC SOLID STATE PHYSICS
Volume 258, Issue 11, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/pssb.202100201
Keywords
aluminum gallium nitride (AlGaN); double-heterostructures; molecular beam epitaxy; point defects; ultraviolet lasers
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Funding
- Natural Sciences and Engineering Research Council of Canada (NSERC) [RGPIN-2019-04726]
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By growing the AlGaN active layer at a higher temperature, the lasing threshold of the AlGaN/AlN laser has been significantly reduced, with successful control of Al vacancy related point defects demonstrated by the absence of defect emission in the visible band.
Herein, aluminum gallium nitride (AlGaN)/AlN double-heterostructure (DH) laser at 287 nm with a lasing threshold of 530 kW cm(-2) is shown. The laser structure is grown on the AlN-on-sapphire template by molecular beam epitaxy. This lasing threshold is drastically reduced compared with the previously reported AlGaN DH lasers at 297 nm with a threshold of around 1 MW cm(-2). The detailed studies indicate that this improvement is mainly attributed to the control of defect formation largely due to the increased growth temperature of the AlGaN active layer. This is consistent with the improved internal quantum efficiency at low excitations. Moreover, the control of Al vacancy related point defects is clearly demonstrated by the absence of defect emission in the visible band.
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