Influence of compressive stress on the thermal conductivity of aluminosilicate and magnesite materials

Litovskii, E. Ya.; Kushnirskii, G. M.; Fedina, I. G.

doi:10.1007/bf01528947

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“…With modulating the stress from −15 GPa compression to +15 GPa tension, although the ϱ (ω) at low energy, C v (ω) and τ B decreased, the κ increased by tensile stress due to the enhancement of υ g and 1/τ alloy , as shown in figure 7(a). Our result is consistent with aluminosilicate and magnesite material from Litovskii et al [34], serpentine graphene from Gao et al [35] and boron nitride from Zhu et al [36]. The κ ∼ σ 0 increasing slopes of GaN, Al 0.5 Ga 0.5 N and AlN nanofilms are 0.028 Wm −1 K −1 GPa −1 , 0.016 Wm −1 K −1 GPa −1 and 0.033 Wm −1 K −1 GPa −1 , respectively, originating from evolution of mass density, elastic modulus and scattering rates.…”

Section: Bte and Thermal Conductivitysupporting

confidence: 93%

Effect of stress on thermal properties of AlGaN nanofilms

Fan¹,

Yan²,

Huang³

et al. 2022

Semicond. Sci. Technol.

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Aluminum Gallium Nitride (AlGaN) nanofilms have been widely applied as active layers in ultra-violet (UV) opto-electronic devices and power electronics. Stress plays essential role in AlGaN based devices, especially in high electron mobility transistor (HEMT). Therefore, it is necessary to investigate the thermal properties of AlGaN nanofilms with various stresses. In this work, biaxial stressed [0001] oriented AlGaN nanofilms were studied. The phonon dispersion, density of states, velocity and heat capacity were simulated based on the elastic theory. Thermal conductivities of AlGaN nanofilms, which was found 1~2 orders of magnitude lower than the bulk materials, were then calculated by Boltzmann transport equation (BTE). Due to the modification of phonon dispersion and increasing of group velocity by tensile stress, the thermal conductivities of AlGaN nanofilms increase from compressive stress (-15 GPa) to tensile stress (+15 GPa). Moreover, a phonon energy gap appears in AlN nanofilm of -15 GPa, which disrupts the linear relation between thermal conductivity and stresses. Our work confirmed that the stress could be promising to tune the thermal conductivity of AlGaN nanofilms.

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Section: Bte and Thermal Conductivitysupporting

confidence: 93%