Thermoelectric performance of n-type polycrystalline SnSe with surface depletion by pressureless sintering
- Thermoelectric performance of n-type polycrystalline SnSe with surface depletion by pressureless sintering
- 천동원; Jongmin Byun; Hyeunhwan An; 홍재영; Jaeyun Moon
- Tin selenide; Mechanical alloying; Pressureless sintering; Thermoelectric property
- Issue Date
- Applied surface science
- VOL 544, 148834
- In this study, polycrystalline SnSe samples were prepared by a series of mechanical alloying (MA), uniaxial compaction, and subsequently pressureless sintering. It was found that the grains in the resultant SnSe samples grow along the (1 1 1) plane direction, resulting in forming a layered structure. Depending on the sintering time, the SnSe samples show the conversion of p-type conduction with the Seebeck coefficient value of +503 μV/K to n-type conduction with the Seebeck coefficient value of ？1500 μV/K. The samples were characterized using X-ray diffraction and Raman spectroscopy to reveal that the transition of the Seebeck properties is due to the imbalanced composition of SnSe caused by impurities (SnSe2, SnSe1-x) formed during pressureless sintering. Also, the experiments and characterization results demonstrated a possibility to enhance thermoelectric properties if the pressureless sintering conditions would be well-controlled.
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