|About this Abstract
||2016 TMS Annual Meeting & Exhibition
||Alloys and Compounds for Thermoelectric and Solar Cell Applications IV
||Ni/(Bi0.25Sb0.75)2Te3 and Ni/Bi2(Se0.1Te0.9) Interfacial Reactions
||Sinn-wen Chen, Ting-ruei Yang, Haw-wen Hsiao, Hsu-shen Chu, Jenn-dong Huang
|On-Site Speaker (Planned)
This interfacial reactions between the Ni barrier layer and the P-type (Bi0.25Sb0.75)2Te3 and the N-type Bi2(Se0.1Te0.9) thermoelectric materials are examined. Two reaction layers are observed in the Ni/(Bi0.25Sb0.75)2Te3 couples heat-treated at 300oC. The reaction layer adjacent to the Ni layer is relatively planar, and its composition is Bi-22.1at%Sb-36.3at%Te-41.5at%Ni. The bright layer adjacent to the thermoelectric substrate is non-planar. Its composition is Bi-18.2at%Sb-58.7at%Te- 1.3at%Ni. It is likely the (Bi,Sb)2Te3 compound with 1.3at% Ni solubility. Similar results with slower reaction rates are found in the couples reacted at 250oC. Two layers are observed in the Ni/Bi2(Te0.9Se0.1)3 reactions at 300oC. The reaction layer adjacent to the Ni layer is planar with a composition of Bi-1.4at%Se-46.4atTe- 40.1at%Ni. The composition of the brighter phase is Bi-1.4at%Se-46.4atTe-40.1at%Ni, and is the BiTe phase. Gray streaks are observed inside the bright phase region, but their compositions are too thin to be accurately determined.
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