Enhancing thermoelectric performance in hierarchically structured BiCuSeO by increasing bond covalency and weakening carrier-phonon coupling
文献类型：期刊论文
| 作者 | Xu W(徐伟) ; Wang, SY; Zhu, YC; Ventura, KJ; Tan, X; Xu, W; Lin, YH; Yang, JH; Nan, CW; Zhu YC(朱英才)
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| 刊名 | ENERGY & ENVIRONMENTAL SCIENCE
 |
| 出版日期 | 2017 |
| 卷号 | 10期号:7页码:1590-1599 |
| ISSN号 | 1754-5692 |
| DOI | 10.1039/c7ee00464h |
| 文献子类 | Article |
| 英文摘要 | BiCuSeO oxyselenides are promising thermoelectric materials at intermediate temperatures, primarily due to their ultralow lattice thermal conductivity (kappa(L)) and high Seebeck coefficient. The intrinsically low carrier mobility in these materials, normally below similar to 20 cm(2) V-1 s(-1) at 300 K, however, largely limits further improvements of their thermoelectric properties. In this study, by introducing less electronegative Te into the conductive Cu-Se layers, we demonstrate that the enhanced chemical bond covalency results in smaller effective mass and thus improved carrier mobility, through the weakening of carrier-phonon coupling. The improved carrier mobility by Te-doping largely retains the electrical conductivity values and thus high power factors even with decreased carrier concentrations. Meanwhile, the hierarchical structural features including dual point defects, nanoinclusions, grain boundaries, etc., originating from the nonequilibrium self-propagating high-temperature synthesis (SHS) processes, further reduce kappa(L) close to the amorphous limit. Ultimately, a maximum ZT value of similar to 1.2 at 873 K is achieved in Bi0.96Pb0.04CuSe0.95Te0.05O, similar to 35% improvement as compared with that of Te-free Bi0.96Pb0.04CuSeO and similar to 2.4 times higher than that of the pristine sample. Furthermore, our study elucidates that weakening of carrier-phonon coupling through regulating chemical bonding within the conductive functionalities can be an effective avenue for further improving the thermoelectric performance of BiCuSeO. |
| 电子版国际标准刊号 | 1754-5706 |
| WOS关键词 | LATTICE THERMAL-CONDUCTIVITY ; DOPED BICUSEO ; TRANSPORT-PROPERTIES ; RECENT PROGRESS ; OXYSELENIDES ; CRYSTALS ; SYSTEM ; OXIDE ; 1ST-PRINCIPLES ; ENHANCEMENT |
| WOS研究方向 | Chemistry ; Energy & Fuels ; Engineering ; Environmental Sciences & Ecology |
| 语种 | 英语 |
| WOS记录号 | WOS:000405279900007 |
| 源URL | [http://ir.ihep.ac.cn/handle/311005/285232]  |
| 专题 | 高能物理研究所_多学科研究中心 高能物理研究所_粒子天体物理中心 |
| 作者单位 | 中国科学院高能物理研究所 |
| 推荐引用方式 GB/T 7714 | Xu W,Wang, SY,Zhu, YC,et al. Enhancing thermoelectric performance in hierarchically structured BiCuSeO by increasing bond covalency and weakening carrier-phonon coupling[J]. ENERGY & ENVIRONMENTAL SCIENCE,2017,10(7):1590-1599. |
| APA | 徐伟.,Wang, SY.,Zhu, YC.,Ventura, KJ.,Tan, X.,...&Ren, GK.(2017).Enhancing thermoelectric performance in hierarchically structured BiCuSeO by increasing bond covalency and weakening carrier-phonon coupling.ENERGY & ENVIRONMENTAL SCIENCE,10(7),1590-1599. |
| MLA | 徐伟,et al."Enhancing thermoelectric performance in hierarchically structured BiCuSeO by increasing bond covalency and weakening carrier-phonon coupling".ENERGY & ENVIRONMENTAL SCIENCE 10.7(2017):1590-1599. |
入库方式： OAI收割
来源：高能物理研究所
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