Effect of thermal interaction between bulk GaN substrates and corral sapphire on blue light emission InGaN/GaN multi-quantum wells by MOCVD

Sivanathan, P.C. and Shuhaimi, Ahmad and Hamza, Hebal and Kowsz, Stacy J. and Abdul Khudus, Muhammad Imran Mustafa and Li, Hong Jian and Allif, Kamarul (2018) Effect of thermal interaction between bulk GaN substrates and corral sapphire on blue light emission InGaN/GaN multi-quantum wells by MOCVD. Superlattices and Microstructures, 119. pp. 157-165. ISSN 0749-6036

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Official URL: https://doi.org/10.1016/j.spmi.2018.04.040

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 716 °C and observed peak wavelength at 463 nm. While the bulk GaN substrate with sapphire corral grown at 703 °C and observed a blueshift at 433 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 435 nm and 450 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 10 °C–15 °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.

Item Type: Article
Uncontrolled Keywords: Thermal conductivity; Bulk GaN substrate; Blue light emission; PL; GaN cap thickness
Subjects: Q Science > Q Science (General)
Q Science > QC Physics
Divisions: Faculty of Science > Dept of Physics
Depositing User: Ms. Juhaida Abd Rahim
Date Deposited: 11 Mar 2019 06:46
Last Modified: 11 Mar 2019 06:46
URI: http://eprints.um.edu.my/id/eprint/20644

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