Electrically Pumped III-N Microcavity Light Emitters Incorporating an Oxide Confinement Aperture

• Published in: Nanoscale research letters 2017-01, Vol.12 (1), p.15-15, Article 15
• Main Authors: Lai, Ying-Yu, Chang, Tsu-Chi, Li, Ya-Chen, Lu, Tien-Chang, Wang, Shing-Chung
• Format: Article
• Language: English
• Subjects: Chemistry and Materials Science; Materials Science; Molecular Medicine; Nano Express; Nanochemistry; Nanoscale Science and Technology; Nanotechnology; Nanotechnology and Microengineering
• ISSN: 1931-7573; 1556-276X
• DOI: 10.1186/s11671-016-1801-2

In this work, we report on electrically pumped III-N microcavity (MC) light emitters incorporating oxide confinement apertures. The utilized SiO 2 aperture can provide a planar ITO design with a higher index contrast (~1) over other previously reported approaches. The fabricated MC light emitter with a 15-μm-aperture shows a turn-on voltage of 3.3 V, which is comparable to conventional light emitting diodes (LEDs), showing a good electrical property of the proposed structure. A uniform light output profile within the emission aperture suggesting the good capability of current spreading and current confinement of ITO and SiO 2 aperture, respectively. Although the quality factor ( Q ) of fabricated MC is not high enough to achieve lasing action (~500), a superlinear emission can still be reached under a high current injection density (2.83 kA/cm 2 ) at 77 K through the exciton-exciton scattering, indicating the high potential of this structure for realizing excitonic vertical-cavity surface-emitting laser (VCSEL) action or even polariton laser after fabrication optimization.