Anion-site-modulated thermoelectric properties in Ge2Sb2Te5-based compounds
文献类型：期刊论文
| 作者 | Hu, P; Wei, TR; Huang, SJ; Xia, XG; Qiu, PF; Yang, J; Chen, LD; Shi, X |
| 刊名 | RARE METALS
 |
| 出版日期 | 2020-10-01 |
| 期号 | 10页码:1127 |
| ISSN号 | 1001-0521 |
| DOI | 10.1007/s12598-020-01476-4 |
| 文献子类 | Article |
| 英文摘要 | The amalgamation of multi-subjects often elicits novel materials, new concepts and unexpected applications. Recently, Ge2Sb2Te5, as the most established phase-change material, has been found to exhibit decent thermoelectric performance in its stable, hexagonal phase. The challenge for higher figure of merit (zT) values lies in reducing the hole carrier concentration and enhancing the Seebeck coefficient, which, however, can be hardly realized by conventional doping. Here in this work, we report that the electrical properties of Ge(2)Sb(2)Te(5)can be readily optimized by anion-site modulation. Specifically, Se/S substitution for Te induces stronger and more ionic bonding, lowering the hole density. Furthermore, an increase in electronic density of state is introduced by Se substitution, contributing to a large increase in Seebeck coefficient. Combined with the reduced thermal conductivity, maximumzTvalues above 0.7 at 800 K have been achieved in Se/S-alloyed materials, which is similar to 30% higher than that in the pristine Ge2Sb2Te5. |
| WOS关键词 | THERMAL-CONDUCTIVITY ; IMPURITY SCATTERING ; PERFORMANCE |
| WOS研究方向 | Materials Science ; Metallurgy & Metallurgical Engineering |
| 语种 | 英语 |
| 出版者 | NONFERROUS METALS SOC CHINA |
| 源URL | [http://ir.sic.ac.cn/handle/331005/27927]  |
| 专题 | 中国科学院上海硅酸盐研究所 |
| 推荐引用方式 GB/T 7714 | Hu, P,Wei, TR,Huang, SJ,et al. Anion-site-modulated thermoelectric properties in Ge2Sb2Te5-based compounds[J]. RARE METALS,2020(10):1127. |
| APA | Hu, P.,Wei, TR.,Huang, SJ.,Xia, XG.,Qiu, PF.,...&Shi, X.(2020).Anion-site-modulated thermoelectric properties in Ge2Sb2Te5-based compounds.RARE METALS(10),1127. |
| MLA | Hu, P,et al."Anion-site-modulated thermoelectric properties in Ge2Sb2Te5-based compounds".RARE METALS .10(2020):1127. |
入库方式： OAI收割
来源：上海硅酸盐研究所
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