Simultaneous optimization of power factor and thermal conductivity via charge transfer effect and enhanced scattering of phonons in Si80Ge20P1/CoSi2 composites
SiGe based alloy is a promising medium-high temperature thermoelectric material that has been applied in the field of aerospace exploration. So far, utilizing the second phase to promote the scattering of phonons is a common way to improve the thermoelectric performance of SiGe based alloy, but this...
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| Language: | English |
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Elsevier
2025-03-01
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| Series: | Journal of Materiomics |
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| Online Access: | http://www.sciencedirect.com/science/article/pii/S2352847824000893 |
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| author | Runze Shi Jie Gao Lei Miao Chengyan Liu Ying Peng Jun-Liang Chen Huajun Lai Kun Hu |
| author_facet | Runze Shi Jie Gao Lei Miao Chengyan Liu Ying Peng Jun-Liang Chen Huajun Lai Kun Hu |
| author_sort | Runze Shi |
| collection | DOAJ |
| description | SiGe based alloy is a promising medium-high temperature thermoelectric material that has been applied in the field of aerospace exploration. So far, utilizing the second phase to promote the scattering of phonons is a common way to improve the thermoelectric performance of SiGe based alloy, but this often deteriorates the electrical properties. In this study, the Si80Ge20P1/CoSi2 composites have been prepared by mechanical alloying and spark plasma sintering, and the content of cobalt silicide (CoSi2) nanoparticles have been manipulated. Since the CoSi2 nanoparticles possess higher carrier concentration and smaller work function than the Si80Ge20P1 matrix, the carrier concentrations of composites have been pushed up due the charge transfer effect. Meanwhile, the formation of nano-sized phase interfaces and stacking faults in the composites has enhanced the scattering of low-frequency phonons. As a result, the optimal power factor of 3.41 mW⋅m−1⋅K−2 and thermal conductivity of 2.29 W⋅m−1⋅K−1 have been achieved, and the corresponding zT reaches up to 1.3 in the Si80Ge20P1+0.5% CoSi2 (in mole) composite at 873 K. This work provides a new idea for developing the performance of SiGe based alloy. |
| format | Article |
| id | doaj-art-98a7d3e81711401db8d2432fa2fc8786 |
| institution | Kabale University |
| issn | 2352-8478 |
| language | English |
| publishDate | 2025-03-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Journal of Materiomics |
| spelling | doaj-art-98a7d3e81711401db8d2432fa2fc87862025-01-14T04:12:27ZengElsevierJournal of Materiomics2352-84782025-03-01112100874Simultaneous optimization of power factor and thermal conductivity via charge transfer effect and enhanced scattering of phonons in Si80Ge20P1/CoSi2 compositesRunze Shi0Jie Gao1Lei Miao2Chengyan Liu3Ying Peng4Jun-Liang Chen5Huajun Lai6Kun Hu7Guangxi Key Laboratory of Information Materials, Guangxi Collaborative Innovation Center of Structure and Property for New Energy Materials, Guilin University of Electronic Technology, Guilin 541004, Guangxi, ChinaGuangxi Key Laboratory of Information Materials, Guangxi Collaborative Innovation Center of Structure and Property for New Energy Materials, Guilin University of Electronic Technology, Guilin 541004, Guangxi, China; Corresponding author.Novel Battery Materials Research Center of Engineering Technology, State Key Laboratory of Featured Metal Materials and Life-cycle Safety for Composite Structures, School of Physical Science and Technology, Guangxi University, Nanning 530004, Guangxi, China; Corresponding author.Guangxi Key Laboratory of Information Materials, Guangxi Collaborative Innovation Center of Structure and Property for New Energy Materials, Guilin University of Electronic Technology, Guilin 541004, Guangxi, ChinaGuilin University of Electronic Technology, Guilin 541004, Guangxi, ChinaGuangxi Key Laboratory of Information Materials, Guangxi Collaborative Innovation Center of Structure and Property for New Energy Materials, Guilin University of Electronic Technology, Guilin 541004, Guangxi, ChinaGuangxi Academy of Sciences, Nanning, 530007, Guangxi, ChinaGuangxi Key Laboratory of Information Materials, Guangxi Collaborative Innovation Center of Structure and Property for New Energy Materials, Guilin University of Electronic Technology, Guilin 541004, Guangxi, ChinaSiGe based alloy is a promising medium-high temperature thermoelectric material that has been applied in the field of aerospace exploration. So far, utilizing the second phase to promote the scattering of phonons is a common way to improve the thermoelectric performance of SiGe based alloy, but this often deteriorates the electrical properties. In this study, the Si80Ge20P1/CoSi2 composites have been prepared by mechanical alloying and spark plasma sintering, and the content of cobalt silicide (CoSi2) nanoparticles have been manipulated. Since the CoSi2 nanoparticles possess higher carrier concentration and smaller work function than the Si80Ge20P1 matrix, the carrier concentrations of composites have been pushed up due the charge transfer effect. Meanwhile, the formation of nano-sized phase interfaces and stacking faults in the composites has enhanced the scattering of low-frequency phonons. As a result, the optimal power factor of 3.41 mW⋅m−1⋅K−2 and thermal conductivity of 2.29 W⋅m−1⋅K−1 have been achieved, and the corresponding zT reaches up to 1.3 in the Si80Ge20P1+0.5% CoSi2 (in mole) composite at 873 K. This work provides a new idea for developing the performance of SiGe based alloy.http://www.sciencedirect.com/science/article/pii/S2352847824000893Thermoelectric (TE) materialsSiGe based alloyCoSi2Charge transfer effectScattering of phonons |
| spellingShingle | Runze Shi Jie Gao Lei Miao Chengyan Liu Ying Peng Jun-Liang Chen Huajun Lai Kun Hu Simultaneous optimization of power factor and thermal conductivity via charge transfer effect and enhanced scattering of phonons in Si80Ge20P1/CoSi2 composites Journal of Materiomics Thermoelectric (TE) materials SiGe based alloy CoSi2 Charge transfer effect Scattering of phonons |
| title | Simultaneous optimization of power factor and thermal conductivity via charge transfer effect and enhanced scattering of phonons in Si80Ge20P1/CoSi2 composites |
| title_full | Simultaneous optimization of power factor and thermal conductivity via charge transfer effect and enhanced scattering of phonons in Si80Ge20P1/CoSi2 composites |
| title_fullStr | Simultaneous optimization of power factor and thermal conductivity via charge transfer effect and enhanced scattering of phonons in Si80Ge20P1/CoSi2 composites |
| title_full_unstemmed | Simultaneous optimization of power factor and thermal conductivity via charge transfer effect and enhanced scattering of phonons in Si80Ge20P1/CoSi2 composites |
| title_short | Simultaneous optimization of power factor and thermal conductivity via charge transfer effect and enhanced scattering of phonons in Si80Ge20P1/CoSi2 composites |
| title_sort | simultaneous optimization of power factor and thermal conductivity via charge transfer effect and enhanced scattering of phonons in si80ge20p1 cosi2 composites |
| topic | Thermoelectric (TE) materials SiGe based alloy CoSi2 Charge transfer effect Scattering of phonons |
| url | http://www.sciencedirect.com/science/article/pii/S2352847824000893 |
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