首页|(162927)Reduction of in-plane and cross-plane thermal conductivities by polarization electric field induced in In_xGa_(1-x)N/GaN superlattice
(162927)Reduction of in-plane and cross-plane thermal conductivities by polarization electric field induced in In_xGa_(1-x)N/GaN superlattice
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NSTL
Elsevier
In this paper, polarization electric field (PEF) induced in GaN/In_xGa_(1-x)N superlattice (SL) was studied and found it can be treated as a reductant of thermal conductivity (k). Elastic properties and phonon group velocity are modified by the impact of interfacial PEF as by inverse piezoelectric effect. It improves scattering and thermal resistance at the boundaries because of dissimilarity in specific heat and group velocity, that decreases transmission coefficient of phonon and more acoustic mismatches resulting in reduction of in-plane (k_(ip)) as well as cross-plane (k_(cp)) thermal conductivities. k_(ip) of In_xGa_(1-x)N (5 nm)/ GaN (10 nm) SL with (without) interfacial PEF field are 7.807 (8.921), 7.350 (8.355) and 7.018 (8.090) Wm(-1)K~(-1) respectively, for x = 0.1,0.3 and 0.5; whereas k_(cp) for the similar compositions are respectively, 4.652 (5.710), 4.282 (5.221) and 4.081(5.185) Wm~(-1)K~(-1) at 300 K demonstrating the reduction exceeds 20%. It shows that the optimal k can be accomplished with the adaptation of nitride SL's electric field for thermoelectric improvements.
Polarization electric fieldGaN/In_xGa_(1-x)N superlatticesPhonon scatteringPhonon mean free pathThermal boundary resistanceThermal conductivity
Subhranshu Sekhar Sahu、Bijay Kumar Sahoo
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Department of Physics, National Institute of Technology, Raipur 492010, India
NSTL
Elsevier
