Abstract

The thermal conductivities κ of wurtzite InxGa1-xN are investigated using equilibrium molecular dynamics (MD) method. The κ of InxGa1-xN rapidly declines from InN (κInN = 141 W/mK) or GaN (κGaN = 500 W/mK) to InxGa1-xN (x≠ or 1), and reaches a minimum (κmin = 19 W/mK) when x is around 0.5 at 300 K. The mean free path (MFP) of InxGa1-xN, ranging from 2 to 5 nm and following the same trend with the κ, is extrapolated in our simulation and a parabolic relationship between x and MFP is established. We find that the κ of InxGa1-xN decreases with increasing temperatures. The evolution of κ of InxGa1-xN is also examined by projecting the momentum-energy relationship of phonons from MD trajectories. The phonon dispersion and phonon density of states for InxGa1-xN reflect a slightly more flattened dispersive phononic curve of the alloying system. Despite an overestimated κ than experimental values, our calculated κ at 300 K agrees well with the results obtained by solving Boltzmann transport equation and also has the same stoichiometric trend with the experimental data. Our study provides the coherent analysis of the effect of thickness, temperature and stoichiometric content on the thermal transport of InxGa1-xN which is helpful for the thermal management of InxGa1-xN based devices.

Full Text
Published version (Free)

Talk to us

Join us for a 30 min session where you can share your feedback and ask us any queries you have

Schedule a call