Abstract
A detailed investigation of residual thermal stress and misfit strain in GaN epitaxial layers grown on technologically important substrates is performed. The thermal stress is low when GaN is grown on AlN, SiC and Si, and relatively higher when Al2O3 substrate is used. The stress is compressive for AlN and Al2O3 and tensile for Si and SiC substrates. Residual thermal stress analysis was also performed for three layer heterostructures of GaN/AlN/6H-SiC and GaN/AlN/Al2O3. The stress remains the same when a sapphire substrate is used with or without an AlN buffer layer but reduces by an order of magnitude when a 6H-SiC substrate is used with an AlN buffer layer.
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Barghout, K., Chaudhuri, J. Calculation of residual thermal stress in GaN epitaxial layers grown on technologically important substrates. Journal of Materials Science 39, 5817–5823 (2004). https://doi.org/10.1023/B:JMSC.0000040094.33095.6f
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DOI: https://doi.org/10.1023/B:JMSC.0000040094.33095.6f