Thermoelectric properties of the tetradymite-type Bi₂Te₂S–Sb₂Te₂S solid solution

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• 作者：D.C. Grauer ; Y.S. Hor ; A.J. Williams ; R.J. Cava
• 关键词：A. Chalcogenides ; C. X-ray diffraction ; D. Electrical properties ; D. Semiconductivity ; D. Thermal conductivity
• 刊名：Materials Research Bulletin
• 出版年：2009
• 出版时间：September 2009
• 年：2009
• 卷：44
• 期：9
• 页码：1926-1929
• 全文大小：397 K

文摘

The thermoelectric properties of the tetradymite-type Bi_2−xSb_xTe₂S solid solution (0 ≤ x ≤ 2) are reported for the temperature range 5–300 K. The properties of non-stoichiometric, Cl and Sn doped n- and p-type variants are reported as well. The Seebeck coefficients for these materials range from −170 to +270 μV K⁻¹ while the resistivities range from those of semimetals, 2 mΩ cm, to semiconductors, >1000 mΩ cm. Thermal conductivities were low for most compositions, typically 1.5 W m⁻¹ K⁻¹. Nominally undoped Bi₂Te₂S shows the highest thermoelectric efficiency amongst the tested materials with a ZT = 0.26 at 300 K that decreased to 0.04 at 100 K. The crystal structure of Sb₂Te₂S, a novel tetradymite-type material, is also reported.