First-principles calculations find that tetragonal GeS2 and GeSe2 suppress cross-plane lattice heat flow to about 1.2 and 1.5 W/m/K at 300 K, yielding a moderate cross-plane zT up to 0.257 for n-type GeS2 at 800 K.
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Anisotropic Phonon Heat Flow and Thermoelectric Response in Tetragonal GeS$_2$ and GeSe$_2$
First-principles calculations find that tetragonal GeS2 and GeSe2 suppress cross-plane lattice heat flow to about 1.2 and 1.5 W/m/K at 300 K, yielding a moderate cross-plane zT up to 0.257 for n-type GeS2 at 800 K.