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Title: | Effects of surface/interface stress on phonon properties and thermal conductivity in AlN/GaN/AlN heterostructural nanofilms | Authors: | Zhang, S Tang, X Ruan, H Zhu, L |
Issue Date: | Oct-2019 | Source: | Applied physics. A, Materials science & processing, Oct. 2019, v. 125, no. 10, 732 | Abstract: | The effect of surface/interface stress on phonon properties and thermal conductivity of GaN-based heterostructural nanofilms was theoretically investigated through the involvement of stress-dependent elastic modulus of nanostructures. The elastic model was used to quantitatively describe the spatially confined phonons in a GaN-based nanofilm under surface/interface stresses. The relationship between surface/interface stress and phonon thermal conductivity was further calculated for different phonon modes. Numerical results show that the positive (negative) surface/interface stress increases (decreases) the phonon energy and phonon group velocity while decreases (increases) the phonon density of state. With the increase of surface/interface stress, the phonon thermal conductivity of a nanofilm increases in SH mode but decreases in AS and SA modes. The surface/interface stress can also alter the temperature dependence of phonon thermal conductivity in heterostructural nanofilms. These simulation results will contribute to the analysis of heat transport in GaN-based heterostructural nanostructures and provide the theoretical support for the thermal performance design and optimization in GaN-based electronic devices. | Publisher: | Springer | Journal: | Applied physics. A, Materials science & processing | ISSN: | 0947-8396 | EISSN: | 1432-0630 | DOI: | 10.1007/s00339-019-3033-7 | Rights: | © Springer-Verlag GmbH Germany, part of Springer Nature 2019 This version of the article has been accepted for publication, after peer review (when applicable) and is subject to Springer Nature’s AM terms of use(https://www.springernature.com/gp/open-research/policies/accepted-manuscript-terms), but is not the Version of Record and does not reflect post-acceptance improvements, or any corrections. The Version of Record is available online at: https://doi.org/10.1007/s00339-019-3033-7. |
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Ruan_Effects_Surface_Stress.pdf | Pre-Published version | 1.07 MB | Adobe PDF | View/Open |
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