Enhancement in the thermoelectric performance by y substitution on SrSi2

C. S. Lue, M. D. Chou, N. Kaurav, Y. T. Chung, Y. K. Kuo

Research output: Contribution to journalArticlepeer-review

18 Citations (Scopus)

Abstract

We report the results of the Y substitution in Sr1-xY xSi2 with x≤0.15 via measuring the temperature- dependent electrical resistivity, thermal conductivity, as well as Seebeck coefficient. Upon substituting Y onto the Sr sites, the electrical resistivity exhibit semiconducting behavior and the room-temperature electrical resistivity tends to reduce for x≤0.08. The thermal conductivity also decreases with increasing the Y content. Moreover, the Seebeck coefficient has a substantial increase and a maximum of about 220 μV/K at around 80 K has been found for x=0.08. These promising effects lead to a significant enhancement in the thermoelectric performance characterized by the figure-of-merit, ZT. A room-temperature ZT value of approximately 0.4 is thus achieved for Sr 0.92 Y0.08 Si2, about one order of magnitude larger than that of stoichiometric SrSi2.

Original languageEnglish
Article number192105
JournalApplied Physics Letters
Volume94
Issue number19
DOIs
Publication statusPublished - 2009

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy (miscellaneous)

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