Abstract:
:Large reductions in the thermal conductivity of thin silicon membranes have been demonstrated in various porous structures. However, the role of coherent boundary scattering in such structures has become a matter of some debate. Here we report on the first experimental observation of coherent phonon boundary scattering at room temperature in 2D phononic crystals formed by the introduction of air holes in a silicon matrix with minimum feature sizes >100 nm. To delaminate incoherent from coherent boundary scattering, phononic crystals with a fixed minimum feature size, differing only in unit cell geometry, were fabricated. A suspended island technique was used to measure the thermal conductivity. We introduce a hybrid thermal conductivity model that accounts for partially coherent and partially incoherent phonon boundary scattering. We observe excellent agreement between this model and experimental data, and the results suggest that significant room temperature coherent phonon boundary scattering occurs.
journal_name
Nat Communjournal_title
Nature communicationsauthors
Alaie S,Goettler DF,Su M,Leseman ZC,Reinke CM,El-Kady Idoi
10.1038/ncomms8228subject
Has Abstractpub_date
2015-06-24 00:00:00pages
7228issn
2041-1723pii
ncomms8228journal_volume
6pub_type
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