Measurements of the Thermal Resistivity of InAlAs, InGaAs, and InAlAs/InGaAs Superlattices

ACS Applied Materials & Interfaces
G R JaffeM A Eriksson

Abstract

Thermal management efforts in nanoscale devices must consider both the thermal properties of the constituent materials and the interfaces connecting them. It is currently unclear whether alloy/alloy semiconductor superlattices such as InAlAs/InGaAs have lower thermal conductivities than their constituent alloys. We report measurements of the crossplane thermal resistivity of InAlAs/InGaAs superlattices at room temperature, showing that the superlattice resistivities are larger by a factor of 1.2-1.6 than that of the constituent bulk materials, depending on the strain state and composition. We show that the additional resistance present in these superlattices can be tuned by a factor of 2.5 by altering the lattice mismatch and thereby the phonon-mode mismatch at the interfaces, a principle that is commonly assumed for superlattices but has not been experimentally verified without adding new elements to the layers. We find that the additional resistance in superlattices does not increase significantly when the layer thickness is decreased from 4 to 2 nm. We also report measurements of 250-1000 nm thick films of undoped InGaAs and InAlAs lattice-matched to InP substrates, for there is no published thermal conductivity value for th...Continue Reading

References

Oct 4, 2000·Physical Review Letters·M V Simkin, G D Mahan
May 10, 2002·Nature·Rüdeger KöhlerFausto Rossi
Apr 22, 1994·Science·J FaistA Y Cho
Nov 20, 2012·Science·Maria N LuckyanovaGang Chen
Dec 10, 2013·Nature Materials·Jayakanth RavichandranMark A Zurbuchen
Jan 2, 2016·Physical Review Letters·D P SchroederM A Eriksson

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