In this work we develop a multiscale model to investigate the self-heating in nanodevices. The scheme splits up
the simulation region in two domains: the micro domain, modeled by the phonon Boltzmann Transport Equation
(BTE) and the macro domain, where the heat transport is calculated within the Fourier model. Appropriate
boundary conditions match the two domains. The multiscale method is applied to a GaN/AlGaN quantum dot
LED. We find out that the maximum temperature is about 334 K. A comparison with the temperature profile
given by the BTE and Fourier model is provided. Finally, the effect of the temperature on the optical spectrum
is investigated.
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