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dc.contributor.authorKamatagi M.D
dc.contributor.authorVaidya R.G
dc.contributor.authorSankeshwar N.S
dc.contributor.authorMulimani B.G.
dc.date.accessioned2020-06-12T15:04:47Z-
dc.date.available2020-06-12T15:04:47Z-
dc.date.issued2009
dc.identifier.citationInternational Journal of Heat and Mass Transfer , Vol. 52 , 44147 , p. 2885 - 2892en_US
dc.identifier.uri10.1016/j.ijheatmasstransfer.2008.10.032
dc.identifier.urihttp://gukir.inflibnet.ac.in:8080/jspui/handle/123456789/4753-
dc.description.abstractLow-temperature (2 < T < 100 K) lattice thermal conductivity, ?p in a semiconducting free-standing thin film (FSTF) is studied using a modified Callaway model. The quantization of acoustic phonons in FSTFs is taken into account and explicit contributions to ?p from the shear, dilatational and flexural modes of the confined acoustic phonons are considered. The scattering of phonons is assumed to be by sample boundaries, impurities, dislocations and other phonons via both normal and umklapp processes. Numerical results are presented for the GaN system. The phonon confinement effect, the sample finite size effect and the relative importance of confined phonon modes are investigated. The role of dislocations in limiting ?p is also discussed. Results are compared with those based on bulk description of acoustic phonons; bulk phonons are found to underestimate (overestimate) ?p in the boundary scattering regime (at higher temperatures). The calculations demonstrate that low-temperature thermal conductivity studies can lead to a better understanding of phonon scattering in FSTFs. © 2008 Elsevier Ltd. All rights reserved.en_US
dc.subjectConfined phonons
dc.subjectDefects
dc.subjectGaN
dc.subjectPhonon dispersion
dc.subjectPhonon scatterings
dc.subjectThermal conductivity
dc.subjectThin films
dc.titleLow-temperature lattice thermal conductivity in free-standing GaN thin filmsen_US
dc.typeArticle
Appears in Collections:1. Journal Articles

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