Improved High-Temperature Material Stability and Mechanical Properties While Maintaining a High Figure of Merit in Nanostructured p-Type PbTe-Based Thermoelectric Elements

被引:15
作者
Sauerschnig, Philipp [1 ]
Jood, Priyanka [1 ]
Ohta, Michihiro [1 ]
机构
[1] Natl Inst Adv Ind Sci & Technol, Global Zero Emiss Res Ctr, Tsukuba, Ibaraki 3058569, Japan
关键词
contact resistance; lead telluride; mechanical properties; power generation; thermoelectrics; LEAD-TELLURIDE; INTERFACIAL REACTION; POWER-GENERATION; PERFORMANCE; EFFICIENCY; DESIGN; SODIUM; JOINTS; FOIL;
D O I
10.1002/admt.202201295
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
Material stability and mechanical properties of nanostructured p-type Pb0.993-xNaxGe0.007Te (x = 0.02, 0.04) are improved by tuning dopant Na content, while maintaining a high thermoelectric figure of merit zT. Na-rich impurity phases detrimental to the material stability, present in heavily Na-doped p-type PbTe, are absent after reducing the Na doping from 4% to 2%. The flexural strength of 2% Na-doped p-type PbTe measured at 773 K is significantly improved compared to that of the 4% Na-doped p-type PbTe, but lower than that of n-type Pb0.98Ga0.02Te measured in comparison. Excellent thermoelectric performance is maintained for nanostructured Pb0.973Na0.02Ge0.007Te (zT approximate to 2.2 at 810 K). For n-type Pb0.98Ga0.02Te, zT approximate to 1.3 at 760 K is confirmed. Single-leg elements of Pb0.973Na0.02Ge0.007Te and Pb0.98Ga0.02Te with Co80Fe20 contact layers display maximum conversion efficiency eta(max) approximate to 8.4% and eta(max) approximate to 8.2% for temperature difference Delta T approximate to 470 K, respectively. After 240 h operation with Delta T approximate to 470 K, eta(max) decreases by approximate to 33% for the p-type and approximate to 13% for the n-type legs. Lower eta(max) compared to the estimation from the material properties and degradation during operation are attributed to crack formation due to thermal expansion mismatch between PbTe and Co80Fe20 and sublimation from the hot side.
引用
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页数:12
相关论文
共 68 条
[1]   High temperature Si-Ge alloy towards thermoelectric applications: A comprehensive review [J].
Basu, R. ;
Singh, A. .
MATERIALS TODAY PHYSICS, 2021, 21
[2]  
Bates H.E., 1969, NASA TECHNICAL REPOR
[3]   Compatibility between Co-Metallized PbTe Thermoelectric Legs and an Ag-Cu-In Brazing Alloy [J].
Ben-Ayoun, Dana ;
Sadia, Yatir ;
Gelbstein, Yaniv .
MATERIALS, 2018, 11 (01)
[4]  
Beretta D., 2019, MATER SCI ENG, V138
[5]   High-performance bulk thermoelectrics with all-scale hierarchical architectures [J].
Biswas, Kanishka ;
He, Jiaqing ;
Blum, Ivan D. ;
Wu, Chun-I ;
Hogan, Timothy P. ;
Seidman, David N. ;
Dravid, Vinayak P. ;
Kanatzidis, Mercouri G. .
NATURE, 2012, 489 (7416) :414-418
[6]   High thermoelectric figure of merit in nanostructured p-type PbTe-MTe (M = Ca, Ba) [J].
Biswas, Kanishka ;
He, Jiaqing ;
Wang, Guoyu ;
Lo, Shih-Han ;
Uher, Ctirad ;
Dravid, Vinayak P. ;
Kanatzidis, Mercouri G. .
ENERGY & ENVIRONMENTAL SCIENCE, 2011, 4 (11) :4675-4684
[7]   The Universal Influence of Contact Resistance on the Efficiency of a Thermoelectric Generator [J].
Bjork, Rasmus .
JOURNAL OF ELECTRONIC MATERIALS, 2015, 44 (08) :2869-2876
[8]   Interfacial reactions at the joints of PbTe thermoelectric modules using Ag-Ge braze [J].
Chen, Sinn-Wen ;
Wang, Jen-Chieh ;
Chen, Ling-Chieh .
INTERMETALLICS, 2017, 83 :55-63
[9]   A prototype thermoelectric module based on p-type colusite together with n-type nanostructured PbTe for power generation [J].
Chetty, Raju ;
Jood, Priyanka ;
Murata, Masayuki ;
Suekuni, Koichiro ;
Ohta, Michihiro .
APPLIED PHYSICS LETTERS, 2022, 120 (01)
[10]   Electrical, Thermal, and Mechanical Characterization of Novel Segmented-Leg Thermoelectric Modules [J].
D'Angelo, Jonathan ;
Case, Eldon D. ;
Matchanov, Nuraddin ;
Wu, Chun-I ;
Hogan, Timothy P. ;
Barnard, James ;
Cauchy, Charles ;
Hendricks, Terry ;
Kanatzidis, Mercouri G. .
JOURNAL OF ELECTRONIC MATERIALS, 2011, 40 (10) :2051-2062