کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
1791061 | 1524459 | 2013 | 6 صفحه PDF | دانلود رایگان |
We report the fabrication of a four-period AlN/air distributed Bragg reflector (DBR) by in-situ GaN sublimation from microcracks of AlN. The GaN/AlN multilayer structure was grown on a stripe-patterned and dot-patterned Si substrate, and subsequently annealed at 1200 °C in H2 and NH3 atmosphere. Microcracks were observed on the surface and side face of the A1N/air DBRs. We achieved an AlN/air structure by the decomposition of GaN from the microcracks of AlN. Partially crack-free AlN layers were observed over a 5×5 μm area in the c-plane of AlN/air DBRs. The root mean square (RMS) values of the surface and back surface of stripe-patterned AlN/air DBRs were 0.94 and 3.3 nm, respectively. The relative reflectivity was measured using a He–Cd laser (442 nm). In some areas, stripe-patterned and dot-patterned AlN/air DBRs showed a high reflectivity of 83.7% and 90.7%, respectively, at the wavelength of 442 nm.
► AlN/air distributed Bragg reflector (DBR) using GaN sublimation from microcracks.
► The root mean square values of the surface of AlN/air DBRs were 0.94 nm.
► In some area, AlN/air DBRs showed the high reflectivity of 83.7% at 442 nm.
Journal: Journal of Crystal Growth - Volume 370, 1 May 2013, Pages 16–21