Journal of Powder Materials (한국분말재료학회지)

The Korean Powder Metallurgy & Materials Institute (한국분말재료학회 (*구 분말야금학회))
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Influence of Boron Content on the Thermoelectric Properties of p-type Si0.8Ge0.2 Alloy

Si0.8Ge0.2계 합금에서 열전특성에 미치는 B의 영향

  • Hwang, Sung-Doo (Division of Materials Science and Engineering, Pusan National University) ;
  • Choi, Woo-Suk (Division of Materials Science and Engineering, Pusan National University) ;
  • Park, Ik-Min (Division of Materials Science and Engineering, Pusan National University) ;
  • Park, Yong-Ho (Division of Materials Science and Engineering, Pusan National University)
  • Published : 2007.08.28
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Abstract

P-type thermoelectric material $Si_{0.8}Ge_{0.2}$ was sintered by Hot Press process (HP) and the effect of boron ($0.25{\sim}2$ at%) addition on the thermoelectric properties were reported. To enhance the thermoelectric performances, the $Si_{0.8}Ge_{0.2}$, alloys were fabricated by mechanical alloying (MA) and HP. The carrier of p-type SiGe alloy was controlled by B-doping. The effect of sintering condition and thermoelectric properties were investigated. B-doped SiGe alloys exhibited positive seebeck coefficient. The electrical conductivity and thermal conductivity were increased at the small amount of boron content ($0.25{\sim}0.5$ at%). However, they were decreased over 0.5 at% boron content. As a result, the small addition of boron improved the Z value. The Z value of 0.5 at% B doped $Si_{0.8}Ge_{0.2}$ B alloy was $0.9{\times}10{-4}/K$, the highest value among the prepared alloys.

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