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

Journal Article · · Journal of Materials Chemistry. A
DOI:https://doi.org/10.1039/C3TA13456C· OSTI ID:1386947
 [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)

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.

Research Organization:
Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
Grant/Contract Number:
SC0001299; FG02-09ER46577
OSTI ID:
1386947
Journal Information:
Journal of Materials Chemistry. A, Vol. 1, Issue 42; ISSN 2050-7488
Publisher:
Royal Society of ChemistryCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 115 works
Citation information provided by
Web of Science

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Cited By (9)

Thermoelectric Devices for Power Generation: Recent Progress and Future Challenges : Thermoelectric Devices for Power Generation journal September 2015
Thermoelectric Devices: A Review of Devices, Architectures, and Contact Optimization journal December 2017
Fabrication of Cu-Doped Bi2Te3 Nanoplates and Their Thermoelectric Properties journal September 2016
Exploring the Origin of Contact Destruction in Tetradymite-Like-Based Thermoelectric Elements journal February 2019
Global Analysis of Influence of Contacts on Heusler-Based Thermoelectric Modules journal April 2019
Concentrating solar thermoelectric generators with a peak efficiency of 7.4% journal September 2016
Physical origin of inertness of Ta contacts on Bi 2 Te 3 journal November 2018
Effect of solder and barrier layer elements on the thermoelectric properties of Bi 0.5 Sb 1.5 Te 3 journal August 2019
High thermoelectric cooling performance of n-type Mg 3 Bi 2 -based materials journal July 2019

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