Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
7938574 | Superlattices and Microstructures | 2018 | 17 Pages |
Abstract
The InGaN/GaN multi-quantum wells, growth on bulk GaN substrate were studied for blue light emission. Growth temperature plays a key role determining the peak wavelength of a quantum well. The study was carried out by growing quantum wells, MQWs on the whole sapphire at 716â¯Â°C and observed peak wavelength at 463â¯nm. While the bulk GaN substrate with sapphire corral grown at 703â¯Â°C and observed a blueshift at 433â¯nm peak wavelength. These results contradict that of typical observation of wavelength emission inversely proportional to the growth temperature. On the other hand, the growth of GaN-sapphire and GaN-silicon at similar conditions emits 435â¯nm and 450â¯nm respectively. The heat interaction of bulk GaN substrates surrounded by the sapphire corral exhibits different growth conditions in multi-quantum wells when compared to that of a whole sapphire substrate (absence of bulk GaN). The predicated surface temperature of bulk GaN substrate is 10â¯Â°C-15â¯Â°C of more than the corral sapphire. This observation may link to the difference in the thermal distribution of the growth surface corresponding to the different thermal conductivity ratio. The photoluminescence and computational techniques were used to understand in-depth of the heat interaction.
Related Topics
Physical Sciences and Engineering
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Authors
P.C. Sivanathan, Ahmad Shuhaimi, Hebal Hamza, Stacy J. Kowsz, Muhammad I.M. Abdul Khudus, Hongjian Li, Kamarul Allif,