One-Order Decreased Lattice Thermal Conductivity of SnSe Crystal by Introduction of Nano-Meter SnSe2 Secondary Phase

JOURNAL OF PHYSICAL CHEMISTRY C(2019)

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摘要
In recent years, the layered semiconductor tin selenide (SnSe) has been of great interest in the thermoelectric field because of its remarkable thermoelectric potential. Here, the as-grown Sn0.98Se crystal was found to induce a random secondary phase of SnSe2 in the host SnSe crystal due to similar formation enthalpy between SnSe and SnSe2. In addition, we carefully studied the thermal transport properties of as-grown Sn0.98Se crystals and intrinsic SnSe crystals. The Umklapp scattering is the prominent scattering and results in a low thermal conductivity of 0.77 W/m/K at room temperature along a direction in the intrinsic stoichiometry SnSe crystal. Because of the optical phonon contribution suppressed by the nanoscopic SnSe2 intercalations in the as-grown Sn0.98Se crystal, the thermal conductivity further decreased to 0.45 W/m/K in nonstoichiometric as-grown Sn 0.98 Se crystals, which is a two-fold reduction and close to that of amorphous compounds. Our study may shed more light on the origin of the extra low thermal conductivity in as-grown Sn0.98Se crystals and may provide an efficient way to modulate thermal conductivity by microstructure engineering.
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