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dc.contributor.authorSingh, Shivkant
dc.contributor.authorShervin, Shahab
dc.contributor.authorSun, Haiding
dc.contributor.authorYarali, Milad
dc.contributor.authorChen, Jie
dc.contributor.authorLin, Ronghui
dc.contributor.authorLi, Kuang-Hui
dc.contributor.authorLi, Xiaohang
dc.contributor.authorRyou, Jae-Hyun
dc.contributor.authorMavrokefalos, Anastassios
dc.date.accessioned2018-05-22T09:46:15Z
dc.date.available2018-05-22T09:46:15Z
dc.date.issued2018-05-17
dc.identifier.citationSingh S, Shervin S, Sun H, Yarali M, Chen J, et al. (2018) Using Mosaicity to Tune Thermal Transport in Polycrystalline AlN Thin Films. ACS Applied Materials & Interfaces. Available: http://dx.doi.org/10.1021/acsami.8b02899.
dc.identifier.issn1944-8244
dc.identifier.issn1944-8252
dc.identifier.doi10.1021/acsami.8b02899
dc.identifier.urihttp://hdl.handle.net/10754/627942
dc.description.abstractThe effect of controlling the c-axis alignment (mosaicity) to the cross-plane thermal transport in textured polycrystalline aluminum nitride (AlN) thin films is experimentally and theoretically investigated. We show that by controlling the sputtering conditions we are able to deposit AlN thin films with varying c-axis grain tilt (mosaicity) from 10° to 0°. Microstructural characterization shows that the films are nearly identical in thickness and grain size, and the difference in mosaicity alters the grain interface quality. This has a significant effect to thermal transport where a thermal conductivity of 4.22 W/mK vs. 8.09 W/mK are measured for samples with tilt angles of 10° vs. 0° respectively. The modified Callaway model was used to fit the theoretical curves to the experimental results using various phonon scattering mechanisms at the grain interface. It was found that using a non-gray model gives an overview of the phonon scattering at the grain boundaries, whereas treating the grain boundary as an array of dislocation lines with varying angle relative to the heat flow, best describes the mechanism of the thermal transport. Lastly, our results show that controlling the quality of the grain interface provides a tuning knob to control thermal transport in polycrystalline materials.
dc.description.sponsorshipA. M. acknowledges financial support from the University of Houston. J.H.R. acknowledges partial support from the Texas Center for Superconductivity at the University of Houston (TcSUH).
dc.publisherAmerican Chemical Society (ACS)
dc.relation.urlhttps://pubs.acs.org/doi/10.1021/acsami.8b02899
dc.rightsThis document is the Accepted Manuscript version of a Published Work that appeared in final form in ACS Applied Materials & Interfaces, copyright © American Chemical Society after peer review and technical editing by the publisher. To access the final edited and published work see .
dc.titleUsing Mosaicity to Tune Thermal Transport in Polycrystalline AlN Thin Films
dc.typeArticle
dc.contributor.departmentComputer, Electrical and Mathematical Sciences and Engineering (CEMSE) Division
dc.contributor.departmentElectrical Engineering Program
dc.contributor.departmentPhysical Sciences and Engineering (PSE) Division
dc.contributor.departmentMaterials Science and Engineering Program
dc.contributor.departmentAdvanced Semiconductor Laboratory
dc.identifier.journalACS Applied Materials & Interfaces
dc.eprint.versionPost-print
dc.contributor.institutionMaterials Science and Engineering Program, University of Houston, Houston, TX, 77204-4006, USA
dc.contributor.institutionDepartment of Mechanical Engineering, University of Houston, Houston, TX, 77204-4006, USA
dc.contributor.institutionTexas Center for Superconductivity at UH (TcSUH) University of Houston, Houston, TX, 77204, USA
kaust.personSun, Haiding
kaust.personLin, Ronghui
kaust.personLi, Kuang-Hui
kaust.personLi, Xiaohang


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