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Are Cu2Te-Based Compounds Excellent Thermoelectric Materials?
Zhao, Kunpeng; Liu, Ke; Yue, Zhongmou; Wang, Yancheng; Song, Qingfeng; Li, Jian; Guan, Mengjia; Xu, Qing; Qiu, Pengfei; Zhu, Hong; Chen, Lidong; Shi, Xun
2019-12-30
Source PublicationADVANCED MATERIALS
ISSN0935-9648
Volume31Issue:49
SubtypeArticle
AbstractMost of the state-of-the-art thermoelectric (TE) materials exhibit high crystal symmetry, multiple valleys near the Fermi level, heavy constituent elements with small electronegativity differences, or complex crystal structure. Typically, such general features have been well observed in those well-known TE materials such as Bi2X3-, SnX-, and PbX-based compounds (X = S, Se, and Te). The performance is usually high in the materials with heavy constituent elements such as Te and Se, but it is low for light constituent elements such as S. However, there is a great abnormality in Cu2X-based compounds in which Cu2Te has much lower TE figure of merit (zT) than Cu2S and Cu2Se. It is demonstrated that the Cu2Te-based compounds are also excellent TE materials if Cu deficiency is sufficiently suppressed. By introducing Ag2Te into Cu2Te, the carrier concentration is substantially reduced to significantly improve the zT with a record-high value of 1.8, 323% improvement over Cu2Te and outperforms any other Cu2Te-based materials. The single parabolic band model is used to further prove that all Cu2X-based compounds are excellent TE materials. Such finding makes Cu2X-based compounds the only type of material composed of three sequent main group elements that all possess very high zT s above 1.5.
Keywordelectrical transport single parabolic bands telluride thermal conductivity thermoelectric materials
DOI10.1002/adma.201903480
WOS KeywordLOW THERMAL-CONDUCTIVITY ; POLYCRYSTALLINE SNSE ; CHEMICAL-STABILITY ; HIGH-EFFICIENCY ; HIGH FIGURE ; PERFORMANCE ; MERIT ; ENERGY ; PBSE ; SYSTEM
Language英语
WOS Research AreaChemistry ; Science & Technology - Other Topics ; Materials Science ; Physics
PublisherWILEY-V C H VERLAG GMBH
Citation statistics
Document Type期刊论文
Identifierhttp://ir.sic.ac.cn/handle/331005/27524
Collection中国科学院上海硅酸盐研究所
Recommended Citation
GB/T 7714
Zhao, Kunpeng,Liu, Ke,Yue, Zhongmou,et al. Are Cu2Te-Based Compounds Excellent Thermoelectric Materials?[J]. ADVANCED MATERIALS,2019,31(49).
APA Zhao, Kunpeng.,Liu, Ke.,Yue, Zhongmou.,Wang, Yancheng.,Song, Qingfeng.,...&Shi, Xun.(2019).Are Cu2Te-Based Compounds Excellent Thermoelectric Materials?.ADVANCED MATERIALS,31(49).
MLA Zhao, Kunpeng,et al."Are Cu2Te-Based Compounds Excellent Thermoelectric Materials?".ADVANCED MATERIALS 31.49(2019).
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