High Thermoelectric Power Factor in a Carrier-Doped Magnetic Semiconductor CuFeS

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概要

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• The chalcopyrite CuFeS<inf>2</inf>is a natural magnetic semiconductor, where Fe spins order antiferromagnetically at T_{\text{N}} = 853 K. We investigate the thermoelectric properties of the carrier-doped chalcopyrite alloys, Cu<inf>1-x</inf>Fe<inf>1+x</inf>S<inf>2</inf>with x = 0.03 and 0.05, and Zn<inf>0.03</inf>Cu<inf>0.97</inf>FeS<inf>2</inf>. All systems showed characteristic behavior of n-type degenerate semiconductors. The large Seebeck coefficient with a high carrier-density indicates enhanced carrier mass of m^{*} = 3{\mbox{--}}6m_{0}, where m_{0} is the electron mass. Consequently, the thermoelectric power factor exceeds 1\times 10^{-3} W K^-2m^-1at 400 K. We propose that utilizing magnetic semiconductor can be a new effective strategy to obtain enhanced values of the power factor.

• 2013-04-25

著者

• Tsujii Naohito

  National Inst. For Materials Sci. Ibaraki

• Tsujii Naohito

  National Institute for Materials Science, Tsukuba, Ibaraki 305-0047, Japan

• Mori Takao

  MANA, National Institute for Materials Science, Tsukuba, Ibaraki 305-0044, Japan

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