# Thermal (Kapitza) resistance of interfaces in compositional dependent $$ZnO-In_2O_3$$ superlattices

 Title: Thermal (Kapitza) resistance of interfaces in compositional dependent $$ZnO-In_2O_3$$ superlattices Author: Liang, Xin; Baram, Mor; Clarke, David R. Note: Order does not necessarily reflect citation order of authors. Citation: Liang, Xin, Mor Baram, and David R. Clarke. 2013. “Thermal (Kapitza) Resistance of Interfaces in Compositional Dependent $$ZnO-In_2O_3$$ Superlattices.” Appl. Phys. Lett. 102 (22): 223903. doi:10.1063/1.4809784. Full Text & Related Files: Liang Kapitza Resistance ZnO-In2O3 SL APL 2013.pdf (1.280Mb; PDF) Abstract: Compositionally dependent superlattices, $$In_2O_3$$ $$(ZnO) _k$$, form in the $$ZnO$$-rich portion of the $$ZnO-In_2O_3$$ phase diagram, decreasing thermal conductivity and altering both the electron conductivity and Seebeck coefficient over a wide range of composition and temperature. With increasing indium concentration, isolated point defects first form in $$ZnO$$ and then superlattice structures with decreasing interface spacing evolve. By fitting the temperature and indium concentration dependence of the thermal conductivity to the Klemens-Callaway model, incorporating interface scattering and accounting for conductivity anisotropy, the Kapitza resistance due to the superlattice interfaces is found to be $$5.0 ± 0.6 × 10^{−10} m^2K/W$$. This finding suggests that selecting oxides with a compositionally dependent superlattice structure can be a viable approach, unaffected by grain growth, to maintaining low thermal conductivity at high temperatures. Published Version: doi:10.1063/1.4809784 Other Sources: http://clarke.seas.harvard.edu/sites/default/files/Liang%20Kapitza%20Resistance%20ZnO-In2O3%20SL%20APL%202013.pdf Terms of Use: This article is made available under the terms and conditions applicable to Other Posted Material, as set forth at http://nrs.harvard.edu/urn-3:HUL.InstRepos:dash.current.terms-of-use#LAA Citable link to this page: http://nrs.harvard.edu/urn-3:HUL.InstRepos:13366712 Downloads of this work: