Understanding of the contact of nanostructured thermoelectric n-type Bi[subscript 2]Te[subscript 2.7]Se[subscript 0.3] legs for power generation applications
Name
Paper14_W. S. Liu_J Mater Chem.pdf
Size
1.17 MB
Format
Adobe PDF
Checksum (MD5)
8ad0f1e2e10b5cbe41787cfe3b5e9886
Author(s)
Liu, Weishu
Wang, Hengzhi
Wang, Lijuan
Wang, Xiaowei
Joshi, G.
Chen, Gang
Ren, Zhifeng
Alternative Title
Understanding of the contact of nanostructured thermoelectric n-type Bi2Te2.7Se0.3 legs for power generation applications
Date Issued
September 2013
Journal
Journal of Materials Chemistry A
Publisher
Royal Society of Chemistry
Citation
Liu, Weishu, Hengzhi Wang, Lijuan Wang, Xiaowei Wang, Giri Joshi, Gang Chen, and Zhifeng Ren. “Understanding of the Contact of Nanostructured Thermoelectric n-Type Bi2Te2.7Se0.3 Legs for Power Generation Applications.” J. Mater. Chem. A 1, no. 42 (2013): 13093.
Version
Author's final manuscript
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/Bi[subscript 2]Te[subscript 2.7]Se[subscript 0.3]/Ni legs, although not in p-type Ni/Bi[subscript 0.4]Sb[subscript 1.6]Te[subscript 3]/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 Bi[subscript 2]Te[subscript 3]-based thermoelectric material layer. We found that a p-type region formed within the n-type Bi[subscript 2]Te[subscript 2.7]Se[subscript 0.3] during hot pressing due to Te deficiency and Ni doping, leading to a large contact resistance.
MIT Department
Massachusetts Institute of Technology. Department of Mechanical Engineering
Terms of Use
Creative Commons Attribution-Noncommercial-Share Alike
Persistent DSpace Link
DOI of Published Version
https://doi.org/10.1039/c3ta13456c
