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Issue 42, 2013
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Understanding of the contact of nanostructured thermoelectric n-type Bi2Te2.7Se0.3 legs for power generation applications

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Abstract

Traditional processes of making contacts (metallization layer) onto bulk crystalline Bi2Te3-based materials do not work for nanostructured thermoelectric materials either because of weak bonding strength or an unstable contact interface at temperatures higher than 200 °C. Hot pressing of nickel contact onto nanostructured thermoelectric legs in a one-step process leads to strong bonding. However, such a process results in large contact resistance in n-type Ni/Bi2Te2.7Se0.3/Ni legs, although not in p-type Ni/Bi0.4Sb1.6Te3/Ni legs. A systematic study was carried out to investigate the detailed reaction and diffusion at the interface of the nickel layer and n-type Bi2Te3-based thermoelectric material layer. We found that a p-type region formed within the n-type Bi2Te2.7Se0.3 during hot pressing due to Te deficiency and Ni doping, leading to a large contact resistance.

Graphical abstract: Understanding of the contact of nanostructured thermoelectric n-type Bi2Te2.7Se0.3 legs for power generation applications

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Publication details

The article was received on 30 Aug 2013, accepted on 05 Sep 2013 and first published on 05 Sep 2013


Article type: Paper
DOI: 10.1039/C3TA13456C
Citation: J. Mater. Chem. A, 2013,1, 13093-13100
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    Understanding of the contact of nanostructured thermoelectric n-type Bi2Te2.7Se0.3 legs for power generation applications

    W. Liu, H. Wang, L. Wang, X. Wang, G. Joshi, G. Chen and Z. Ren, J. Mater. Chem. A, 2013, 1, 13093
    DOI: 10.1039/C3TA13456C

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