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Geometries of thin films. Top: side view of double-QL perfect film. Bottom left: top view of nanoporous films with concentrated pores. Bottom right: top view of nanoporous films with distributed pores.
(a) The lattice thermal conductivity of perfect and nanoporous films at 300 K with respect to the number of QLs. (b) The lattice thermal conductivity of single QL perfect/nanoporous films along with bulk values (Ref. 14) and pseudosuperlattices values from Ref. 11 as a function of temperature.
Phonon DOS of thin films of 1–6 QLs. Inset: The lowest 0.2 THz phonon dispersions along direction.
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