Weak Electron–Phonon Coupling and Enhanced Thermoelectric Performance in n-type PbTe–Cu2Se via Dynamic Phase Conversion - Details

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Abstract：

This　study　investigates　Ga-doped　n-type　PbTe　thermoelectric　materials　and　the　dynamic　phase　conversion　process　of　the　second　phases　via　Cu2Se　alloying.　Introducing　Cu2Se　enhances　its　electrical　transport　properties　while　reducing　its　lattice　thermal　conductivity　(κlat)　via　weak　electron–phonon　coupling.　Cu2Te　and　CuGa(Te/Se)2　(tetragonal　phase)　nanocrystals　precipitate　during　the　alloying　process,　resulting　in　Te　vacancies　and　interstitial　Cu　in　the　PbTe　matrix.　At　room　temperature,　Te　vacancies　and　interstitial　Cu　atoms　serve　as　n-type　dopants,　increasing　the　carrier　concentration　and　electrical　conductivity　from　≈1.18　×　1019　cm−3　and　≈1870　S　cm−1　to　≈2.26　×　1019　cm−3　and　≈3029　S　cm−1,　respectively.　With　increasing　temperature,　the　sample　exhibits　a　dynamic　change　in　Cu2Te　content　and　the　generation　of　a　new　phase　of　CuGa(Te/Se)2　(cubic　phase),　strengthening　the　phonon　scattering　and　obtaining　an　ultralow　κlat.　Pb0.975Ga0.025Te-3%CuSe　exhibits　a　maximum　figure　of　merit　of　≈1.63　at　823　K,　making　it　promising　for　intermediate-temperature　device　applications.　©　2022　Wiley-VCH　GmbH.

Keyword：

Cu 2Se alloying dynamic phase conversion electron–phonon coupling n-type PbTe thermoelectrics

Community：

[ 1 ] [Wu, M.]Key Laboratory of Eco-Materials Advanced Technology, College of Materials Science and Engineering, Fuzhou University, Fuzhou, 350108, China
[ 2 ] [Cui, H.-H.]Mechanical and Electrical Engineering Practice Center, Fuzhou University, Fuzhou, 350108, China
[ 3 ] [Cai, S.]Department of Chemistry, Northwestern University, Evanston, IL 60208, United States
[ 4 ] [Cai, S.]Department of Materials Science and Engineering, Northwestern University, Evanston, IL 60208, United States
[ 5 ] [Hao, S.]Department of Materials Science and Engineering, Northwestern University, Evanston, IL 60208, United States
[ 6 ] [Liu, Y.]Department of Materials Science and Engineering, Northwestern University, Evanston, IL 60208, United States
[ 7 ] [Bailey, T.P.]Department of Physics, University of Michigan, Ann Arbor, MI 48109, United States
[ 8 ] [Zhang, Y.]Department of Physics, University of Michigan, Ann Arbor, MI 48109, United States
[ 9 ] [Chen, Z.]Key Laboratory of Eco-Materials Advanced Technology, College of Materials Science and Engineering, Fuzhou University, Fuzhou, 350108, China
[ 10 ] [Luo, Y.]State Key Laboratory of Materials Processing and Die & Mould Technology, School of Materials Science and Engineering, Huazhong University of Science and Technology, Wuhan, 430074, China
[ 11 ] [Uher, C.]Department of Physics, University of Michigan, Ann Arbor, MI 48109, United States
[ 12 ] [Wolverton, C.]Department of Materials Science and Engineering, Northwestern University, Evanston, IL 60208, United States
[ 13 ] [Dravid, V.P.]Department of Materials Science and Engineering, Northwestern University, Evanston, IL 60208, United States
[ 14 ] [Yu, Y.]Key Laboratory of Eco-Materials Advanced Technology, College of Materials Science and Engineering, Fuzhou University, Fuzhou, 350108, China
[ 15 ] [Yu, Y.]Fujian Science & Technology Innovation Laboratory for Optoelectronic Information of China, Fujian, Fuzhou, 350108, China
[ 16 ] [Yu, Y.]Key Laboratory of Advanced Materials Technologies, International (HongKong Macao and Taiwan) Joint Laboratory on Advanced Materials Technologies, College of Materials Science and Engineering, Fuzhou University, Fujian, Fuzhou, 350108, China
[ 17 ] [Luo, Z.-Z.]Key Laboratory of Eco-Materials Advanced Technology, College of Materials Science and Engineering, Fuzhou University, Fuzhou, 350108, China
[ 18 ] [Luo, Z.-Z.]Department of Chemistry, Northwestern University, Evanston, IL 60208, United States
[ 19 ] [Luo, Z.-Z.]Fujian Science & Technology Innovation Laboratory for Optoelectronic Information of China, Fujian, Fuzhou, 350108, China
[ 20 ] [Luo, Z.-Z.]Key Laboratory of Advanced Materials Technologies, International (HongKong Macao and Taiwan) Joint Laboratory on Advanced Materials Technologies, College of Materials Science and Engineering, Fuzhou University, Fujian, Fuzhou, 350108, China
[ 21 ] [Luo, Z.-Z.]School of Materials Science and Engineering, Nanyang Technological University, Singapore 639798, Singapore
[ 22 ] [Zou, Z.]Key Laboratory of Eco-Materials Advanced Technology, College of Materials Science and Engineering, Fuzhou University, Fuzhou, 350108, China
[ 23 ] [Zou, Z.]Fujian Science & Technology Innovation Laboratory for Optoelectronic Information of China, Fujian, Fuzhou, 350108, China
[ 24 ] [Zou, Z.]Eco-Materials and Renewable Energy Research Center, College of Engineering and Applied Sciences, Nanjing University, Nanjing, 210093, China
[ 25 ] [Yan, Q.]School of Materials Science and Engineering, Nanyang Technological University, Singapore 639798, Singapore
[ 26 ] [Yan, Q.]Institute of Materials Research and Engineering, A*STAR, Singapore, 138634, Singapore
[ 27 ] [Kanatzidis, M.G.]Department of Chemistry, Northwestern University, Evanston, IL 60208, United States

Reprint 's Address：

[Luo, Z.-Z.]Key Laboratory of Eco-Materials Advanced Technology, China;;[Kanatzidis, M.G.]Department of Chemistry, United States;;[Yan, Q.]School of Materials Science and Engineering, Singapore 639798, Singapore

Email：

zzluo@fzu.edu.cn |
m-kanatzidis@northwestern.edu |
AlexYan@ntu.edu.sg

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