Electrical contact fabrication and measurements of metals and alloys to thermoelectric materials

Jonathan James D'Angelo, Edward J. Timm, Fei Ren, Bradley D. Hall, Eldon Case, Harold Schock, Mercouri G Kanatzidis, Duck Young Chung, Timothy P. Hogan

Research output: Chapter in Book/Report/Conference proceedingConference contribution

1 Citation (Scopus)

Abstract

Low electrical contact resistance is essential for the fabrication of high efficiency thermoelectric generators in order to convert heat to electricity. These contacts must be stable to high temperatures and through thermal cycling. A ratio of the contact resistance to the leg resistance below 0.1 is the goal for fabrication of a high efficiency thermoelectric power generation device. Here we present the fabrication procedures and characterization of contacts of metal alloys to Pb-Sb-Ag-Te (LAST) and Pb-Sb-Ag-Sn-Te (LASTT) compounds[1, 2]. Contacts were fabricated and measured for both ingot and hot pressed materials. Stainless steel 316 has shown a low resistance contact to these thermoelectric materials when the proper bonding conditions are used. Different time-temperature-pressure conditions for bonding to n-type and to p-type legs are presented. Contact resistances below 10μΩcm2 have been measured. In addition, break tests have shown bond strengths exceeding the semiconductor fracture strength. One of the considerations used in selecting iron alloys for electrical interconnects is the similarity in the coefficient of thermal expansion to the LAST and LASTT materials which is 18-20 ppm/̊C and relatively temperature insensitive. Contacts to the thermoelectric materials were accomplished by diffusion bonding in a furnace developed in our lab at Michigan State University. The furnace is capable of reaching temperatures of up to 1000°C with a controlled atmosphere of a reducing gas. Fabrication procedures and contact data are presented in this paper.

Original languageEnglish
Title of host publicationMaterials Research Society Symposium Proceedings
Pages449-455
Number of pages7
Volume1044
Publication statusPublished - 2008
EventThermoelectric Power Generation - Boston, MA, United States
Duration: Nov 26 2007Nov 29 2007

Other

OtherThermoelectric Power Generation
CountryUnited States
CityBoston, MA
Period11/26/0711/29/07

Fingerprint

thermoelectric materials
Contact resistance
electric contacts
contact resistance
Metals
Fabrication
fabrication
metals
furnaces
Furnaces
thermoelectric power generation
thermoelectric generators
diffusion welding
controlled atmospheres
Diffusion bonding
Temperature
iron alloys
Iron alloys
Stainless Steel
Thermoelectric power

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanical Engineering
  • Mechanics of Materials

Cite this

D'Angelo, J. J., Timm, E. J., Ren, F., Hall, B. D., Case, E., Schock, H., ... Hogan, T. P. (2008). Electrical contact fabrication and measurements of metals and alloys to thermoelectric materials. In Materials Research Society Symposium Proceedings (Vol. 1044, pp. 449-455)

Electrical contact fabrication and measurements of metals and alloys to thermoelectric materials. / D'Angelo, Jonathan James; Timm, Edward J.; Ren, Fei; Hall, Bradley D.; Case, Eldon; Schock, Harold; Kanatzidis, Mercouri G; Chung, Duck Young; Hogan, Timothy P.

Materials Research Society Symposium Proceedings. Vol. 1044 2008. p. 449-455.

Research output: Chapter in Book/Report/Conference proceedingConference contribution

D'Angelo, JJ, Timm, EJ, Ren, F, Hall, BD, Case, E, Schock, H, Kanatzidis, MG, Chung, DY & Hogan, TP 2008, Electrical contact fabrication and measurements of metals and alloys to thermoelectric materials. in Materials Research Society Symposium Proceedings. vol. 1044, pp. 449-455, Thermoelectric Power Generation, Boston, MA, United States, 11/26/07.
D'Angelo JJ, Timm EJ, Ren F, Hall BD, Case E, Schock H et al. Electrical contact fabrication and measurements of metals and alloys to thermoelectric materials. In Materials Research Society Symposium Proceedings. Vol. 1044. 2008. p. 449-455
D'Angelo, Jonathan James ; Timm, Edward J. ; Ren, Fei ; Hall, Bradley D. ; Case, Eldon ; Schock, Harold ; Kanatzidis, Mercouri G ; Chung, Duck Young ; Hogan, Timothy P. / Electrical contact fabrication and measurements of metals and alloys to thermoelectric materials. Materials Research Society Symposium Proceedings. Vol. 1044 2008. pp. 449-455
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