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

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 here 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.

Authors:
 [1];  [2];  [3];  [4];  [4];  [5];  [1]
  1. Univ. of Houston, TX (United States)
  2. Boston College, Chestnut Hill, MA (United States)
  3. Univ. of Houston, TX (United States); Minzu Univ. of China, Beijing (China)
  4. GMZ Energy, Waltham, MA (United States)
  5. Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States)
Publication Date:
Research Org.:
Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
OSTI Identifier:
1386947
Grant/Contract Number:  
SC0001299; FG02-09ER46577
Resource Type:
Accepted Manuscript
Journal Name:
Journal of Materials Chemistry. A
Additional Journal Information:
Journal Volume: 1; Journal Issue: 42; Journal ID: ISSN 2050-7488
Publisher:
Royal Society of Chemistry
Country of Publication:
United States
Language:
English
Subject:
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY

Citation Formats

Liu, Weishu, Wang, Hengzhi, Wang, Lijuan, Wang, Xiaowei, Joshi, Giri, Chen, Gang, and Ren, Zhifeng. Understanding of the contact of nanostructured thermoelectric n-type Bi2Te2.7Se0.3 legs for power generation applications. United States: N. p., 2013. Web. doi:10.1039/C3TA13456C.
Liu, Weishu, Wang, Hengzhi, Wang, Lijuan, Wang, Xiaowei, Joshi, Giri, Chen, Gang, & Ren, Zhifeng. Understanding of the contact of nanostructured thermoelectric n-type Bi2Te2.7Se0.3 legs for power generation applications. United States. doi:10.1039/C3TA13456C.
Liu, Weishu, Wang, Hengzhi, Wang, Lijuan, Wang, Xiaowei, Joshi, Giri, Chen, Gang, and Ren, Zhifeng. Thu . "Understanding of the contact of nanostructured thermoelectric n-type Bi2Te2.7Se0.3 legs for power generation applications". United States. doi:10.1039/C3TA13456C. https://www.osti.gov/servlets/purl/1386947.
@article{osti_1386947,
title = {Understanding of the contact of nanostructured thermoelectric n-type Bi2Te2.7Se0.3 legs for power generation applications},
author = {Liu, Weishu and Wang, Hengzhi and Wang, Lijuan and Wang, Xiaowei and Joshi, Giri and Chen, Gang and Ren, Zhifeng},
abstractNote = {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 here 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.},
doi = {10.1039/C3TA13456C},
journal = {Journal of Materials Chemistry. A},
number = 42,
volume = 1,
place = {United States},
year = {2013},
month = {9}
}

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Cited by: 31 works
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