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Title

Effect of asymmetric concentration profile on thermal conductivity in Ge/SiGe superlattices

AuthorsHahn, Konstanze R.; Cecchi, Stefano; Colombo, Luciano
KeywordsGermanium
Atom scattering
Superlattices
Phonons
Thermal conductivity
Issue Date2016
PublisherAmerican Institute of Physics
CitationApplied Physics Letters 108(20): 203102 (2016)
AbstractThe effect of the chemical composition in Si/Ge-based superlattices on their thermal conductivity has been investigated using molecular dynamics simulations. Simulation cells of Ge/SiGe superlattices have been generated with different concentration profiles such that the Si concentration follows a step-like, a tooth-saw, a Gaussian, and a gamma-type function in direction of the heat flux. The step-like and tooth-saw profiles mimic ideally sharp interfaces, whereas Gaussian and gamma-type profiles are smooth functions imitating atomic diffusion at the interface as obtained experimentally. Symmetry effects have been investigated comparing the symmetric profiles of the step-like and the Gaussian function to the asymmetric profiles of the tooth-saw and the gamma-type function. At longer sample length and similar degree of interdiffusion, the thermal conductivity is found to be lower in asymmetric profiles. Furthermore, it is found that with smooth concentration profiles where atomic diffusion at the interface takes place the thermal conductivity is higher compared to systems with atomically sharp concentration profiles.
Publisher version (URL)https://doi.org/10.1063/1.4949491
URIhttp://hdl.handle.net/10261/159390
Identifiersdoi: 10.1063/1.4949491
issn: 0003-6951
e-issn: 1077-3118
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