Bismuth Telluride/Half‐Heusler Segmented Thermoelectric Unicouple Modules Provide 12% Conversion Efficiency. Issue 38 (13th August 2020)

• Record Type: Journal Article
• Authors: Li, Wenjie; Poudel, Bed; Nozariasbmarz, Amin; Sriramdas, Rammohan; Zhu, Hangtian; Kang, Han Byul; Priya, Shashank
• Is Part Of: Advanced energy materials. Volume 10:Issue 38(2020)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2020-08-13
• Subjects: contact resistance -- conversion efficiency -- module fabrication -- segmented -- thermoelectric modules; Energy harvesting -- Materials -- Periodicals; Energy conversion -- Materials -- Periodicals; Energy storage -- Materials -- Periodicals; Photovoltaics -- Periodicals; Fuel cells -- Periodicals; Thermoelectric materials -- Periodicals; 621.31
• DOI: 10.1002/aenm.202001924
• Languages: English
• ISSNs: 1614-6832

Abstract

Abstract: The rapid enhancement of the thermoelectric (TE) figure‐of‐merit ( zT ) in the past decade has opened opportunities for developing and transitioning solid state waste heat recovery systems. Here, a segmented TE device architecture is demonstrated in conjunction with heterogeneous material integration that results in high unicouple‐level conversion efficiency of 12% under a temperature difference of 584 K. This breakthrough is the result of success in fabricating bismuth telluride/half‐Heusler segmented TE unicouple modules using a "hot‐to‐cold" fabrication technique that provides significantly reduced electrical and thermal contact resistance. Extensive analytical and finite element modeling is conducted to provide an understanding of the nature of thermal transport and contributions arising from various thermal and physical parameters. Bismuth telluride/half‐Heusler based segmented thermoelectric generators (TEGs) can provide higher practical temperature difference with optimum average zT across the whole operating range. These results will have immediate impact on the design and development of TEGs and in the general design of devices based upon heterostructures that take advantage of gradients in the figure of merit. Abstract : A "Hot‐to‐Cold" assembly technique for a bismuth telluride/half‐Heusler segmented thermoelectric unicouple module is fabricated based on the concise module design approach. A high conversion efficiency of 12% under a temperature difference of 584 K is achieved. This method could be further applied in the general design of devices based upon heterostructures that take advantage of gradients in the figure of merit.