Jianglong Zhu, Fujie Zhang, Yilin Tai, Xiaobo Tan, Qian Deng, Pengfei Nan, Ruihuan Cheng, Chengliang Xia, Yue Chen, Binghui Ge, Ran Ang
{"title":"Enhanced thermoelectric performance and mechanical strength in GeTe enable power generation and cooling","authors":"Jianglong Zhu, Fujie Zhang, Yilin Tai, Xiaobo Tan, Qian Deng, Pengfei Nan, Ruihuan Cheng, Chengliang Xia, Yue Chen, Binghui Ge, Ran Ang","doi":"10.1002/inf2.12514","DOIUrl":null,"url":null,"abstract":"<p>Finding a real thermoelectric (TE) material that excels in various aspects of TE performance, mechanical properties, TE power generation, and cooling is challenging for its commercialization. Herein, we report a novel multifunctional Ge<sub>0.78</sub>Cd<sub>0.06</sub>Pb<sub>0.1</sub>Sb<sub>0.06</sub>Te material with excellent TE performance and mechanical strength, which is utilized to construct candidate TE power generation and cooling devices near room temperature. Specifically, the effectiveness of band convergence, combined with optimized carrier concentration and electronic quality factor, distinctly boosts the Seebeck coefficient, thus greatly improving the power factor. Advanced electron microscopy observation indicates that complex multi-scale hierarchical structures and strain field distributions lead to ultra-low lattice thermal conductivity, and also effectively enhance mechanical properties. High <i>ZT</i> ~ 0.6 at 303 K, average <i>ZT</i><sub>ave</sub> ~ 1.18 from 303 to 553 K, and Vickers hardness of ~200 <i>H</i><sub>v</sub> in Ge<sub>0.78</sub>Cd<sub>0.06</sub>Pb<sub>0.1</sub>Sb<sub>0.06</sub>Te are obtained synchronously. Particularly, a 7-pair TE cooling device with a maximum Δ<i>T</i> of ~45.9 K at <i>T</i><sub>h</sub> = 328 K, and a conversion efficiency of ~5.2% at <i>T</i><sub>h</sub> = 553 K achieving in a single-leg device. The present findings demonstrate a unique approach to developing superior multifunctional GeTe-based alloys, opening up a promising avenue for commercial applications.\n <figure>\n <div><picture>\n <source></source></picture><p></p>\n </div>\n </figure></p>","PeriodicalId":48538,"journal":{"name":"Infomat","volume":null,"pages":null},"PeriodicalIF":22.7000,"publicationDate":"2023-12-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/inf2.12514","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Infomat","FirstCategoryId":"88","ListUrlMain":"https://onlinelibrary.wiley.com/doi/10.1002/inf2.12514","RegionNum":1,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q1","JCRName":"MATERIALS SCIENCE, MULTIDISCIPLINARY","Score":null,"Total":0}
引用次数: 0
Abstract
Finding a real thermoelectric (TE) material that excels in various aspects of TE performance, mechanical properties, TE power generation, and cooling is challenging for its commercialization. Herein, we report a novel multifunctional Ge0.78Cd0.06Pb0.1Sb0.06Te material with excellent TE performance and mechanical strength, which is utilized to construct candidate TE power generation and cooling devices near room temperature. Specifically, the effectiveness of band convergence, combined with optimized carrier concentration and electronic quality factor, distinctly boosts the Seebeck coefficient, thus greatly improving the power factor. Advanced electron microscopy observation indicates that complex multi-scale hierarchical structures and strain field distributions lead to ultra-low lattice thermal conductivity, and also effectively enhance mechanical properties. High ZT ~ 0.6 at 303 K, average ZTave ~ 1.18 from 303 to 553 K, and Vickers hardness of ~200 Hv in Ge0.78Cd0.06Pb0.1Sb0.06Te are obtained synchronously. Particularly, a 7-pair TE cooling device with a maximum ΔT of ~45.9 K at Th = 328 K, and a conversion efficiency of ~5.2% at Th = 553 K achieving in a single-leg device. The present findings demonstrate a unique approach to developing superior multifunctional GeTe-based alloys, opening up a promising avenue for commercial applications.
期刊介绍:
InfoMat, an interdisciplinary and open-access journal, caters to the growing scientific interest in novel materials with unique electrical, optical, and magnetic properties, focusing on their applications in the rapid advancement of information technology. The journal serves as a high-quality platform for researchers across diverse scientific areas to share their findings, critical opinions, and foster collaboration between the materials science and information technology communities.