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Article Dans Une Revue Journal of Applied Physics Année : 2013

Effect of embedding nanoparticles on the lattice thermal conductivity of bulk semiconductor crystals

Younès Ezzahri

Résumé

We analyze the effect of embedding semiconductor nanoparticles as extrinsic phonon scattering centers on the steady-state κ(0) and dynamical κ(Ω) behaviors of the lattice thermal conductivity of bulk semiconductor (SC) alloy crystals. As an example, we consider the case of Ge nanoparticles embedded in a Si0.7Ge0.3 alloy crystal host matrix. The analysis includes the study of the effect of changing the size and concentration of the nanoparticles in combination with changing the ambient temperature while all other intrinsic properties of the SC alloy crystal host matrix are kept constant. Our calculations confirm the existence of an optimal nanoparticles size that minimizes κ(0). Depending on the ambient temperature, the optimal size either increases or decreases as a function of the nanoparticles concentration. Our calculations show also the cut-off frequency fC of κ(Ω) to be very sensitive to the size and concentration of the embedded nanoparticles. For a fixed ambient temperature and nanoparticles concentration, fC manifests a very interesting behavior as a function of the nanoparticles size. While embedding nanoparticles in SC alloy matrices reduces the steady-state κ(0), it however tends to increase fC of the dynamical κ(Ω) in comparison with intrinsic SC alloys. The study sheds light also on the fundamental role that normal processes have in treating phonon heat transfer phenomenon.
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hal-04129763 , version 1 (15-06-2023)

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Younès Ezzahri, Karl Joulain. Effect of embedding nanoparticles on the lattice thermal conductivity of bulk semiconductor crystals. Journal of Applied Physics, 2013, 113 (4), pp.043510. ⟨10.1063/1.4789808⟩. ⟨hal-04129763⟩
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