Abstract
Bi2(Se0.1Te0.9)3and Ni are the most commonly used N-type thermoelectric material and barrier layer in commercial thermoelectric modules. This study systematically examines the interfacial reactions between Ni and Bi2(Se0.1Te0.9)3and its constituent material systems. Results related to the interfacial reactions between Ni/Se and Ni/Bi2Se3 are not available in the literature, and are reported for the first time in this study. The reaction phases in the solid/solid Ni/Bi, Ni/Se, Ni/Bi2Te3 and Ni/Bi2(Se0.1Te0.9)3 couples are NiBi3, α-Ni3Se2 and Ni1-xSe, NiTe2 and (Bi2)m(Bi2Te3)n, and NiTe2 and (Bi2)m(Bi2Te3)n, respectively. The reaction phases in the solid/solid Ni/Te and Ni/Bi2Te3 couples evolve with reaction time. Respectively, they are NiTe2 and Bi-oversaturated Ni1-xSe phase in the early stage of reaction, and become Ni3Te2, NiTe0.775 and NiTe2, and NiBi3 and Ni1-xSe phases with longer reaction time. The Ni/Te reaction rate is slower compared with those of Ni/Bi and Bi/Se, yet the dominant reaction phase is the NiTe2 phase in both the Ni/Bi2Te3 and Ni/Bi2(Se0.1Te0.9)3 couples.
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