Fabrication and characterization of single-pair thermoelectric generators of bismuth telluride using silver-sintering technology

Add time:07/27/2019    Source:sciencedirect.com

Silver sintering technology was investigated as a method for interconnect formation of thermoelectric generators (TEGs). Using silver sintering we were able to assemble commercial bismuth telluride pellets and copper legs to fabricate TEGs, which are designed to work at elevated temperatures. Nickel was deposited electroless for 30, 60, and 90 minutes on the bismuth telluride pellets to serve as an anti-diffusion barrier between Ag and Bi2Te3. The impact of different fabrication conditions (i.e. sintering temperatures from 210 to 265°C and pressures from 5 to 7 MPa, respectively) on the properties of single-pair TEGs was investigated. Lowest specific contact resistances of (5.07 ± 3.00) × 10-5 Ω·cm2 were obtained which agree well with state of the art for soldered contacts of bismuth telluride. With TEGs sintered at 6 MPa and 265°C long-term operation tests were performed at temperature gradients across the TEG of 190°C for 360 hours. The Seebeck power remained unchanged showing values around 0.3 mV/K, which slightly depended on the anti-diffusion-layer thickness.

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