Expand band gap and suppress bipolar excitation to optimize thermoelectric performance of Bi0.35Sb1.65Te3 sintered materials
文献类型：期刊论文
| 作者 | Chen, Lidong; Zhang, Qiang; Guo, Zhe; Yan, Zipeng; Song, Kun; Wu, Gang; Wang, Xuemei; Tan, Xiaojian; Hu, Haoyang; Sun, Peng |
| 刊名 | MATERIALS TODAY PHYSICS
 |
| 出版日期 | 2021 |
| 卷号 | 21 |
| 关键词 | THERMAL-CONDUCTIVITY OPTICAL-PROPERTIES TEMPERATURE-RANGE ENHANCEMENT ALLOYS FIGURE POWER (BI,SB)(2)TE-3 EFFICIENCY DEVICES |
| 英文摘要 | Bismuth-telluride-based alloys have been the state-of-art thermoelectric candidates near room temperature. However, sintered samples with higher ZT values in a wide temperature range are still urgently needed for further applications. Especially owing to the small band gap, the minority carriers are boosted at higher temperature and the thermoelectric properties are severely deteriorated. Here, we prepared p-type Bi0.35Sb1.65Te3-Se-x(x) samples by hot pressing to enlarge the band gap and suppress the bipolar excitation. Although the carrier concentrations are slightly increased by the tiny Se alloying, the Seebeck coefficients above 400 K are significantly improved, and the bipolar and lattice contributions to thermal transport are obviously reduced. The x = 0.04 sample thus achieves an average value of 1.1 between 300 and 500 K, and the constructed thermoelectric device produces an output power density of 0.36W cm(-2) and conversion efficiency of 5.24% at a temperature difference of 200 K. These results suggest that Se-doped Bi0.35Sb1.65Te3 is a robust candidate for low-grade heat harvest near room temperature. (C) 2021 Elsevier Ltd. All rights reserved. |
| 源URL | [http://ir.nimte.ac.cn/handle/174433/21333]  |
| 专题 | 2021专题_期刊论文 |
| 作者单位 | 1.Jiang, J (corresponding author), Chinese Acad Sci, Ningbo Inst Mat Technol & Engn, Ningbo 315201, Peoples R China. 2.Tan, XJ |
| 推荐引用方式 GB/T 7714 | Chen, Lidong,Zhang, Qiang,Guo, Zhe,et al. Expand band gap and suppress bipolar excitation to optimize thermoelectric performance of Bi0.35Sb1.65Te3 sintered materials[J]. MATERIALS TODAY PHYSICS,2021,21. |
| APA | Chen, Lidong.,Zhang, Qiang.,Guo, Zhe.,Yan, Zipeng.,Song, Kun.,...&Jiang, Jun.(2021).Expand band gap and suppress bipolar excitation to optimize thermoelectric performance of Bi0.35Sb1.65Te3 sintered materials.MATERIALS TODAY PHYSICS,21. |
| MLA | Chen, Lidong,et al."Expand band gap and suppress bipolar excitation to optimize thermoelectric performance of Bi0.35Sb1.65Te3 sintered materials".MATERIALS TODAY PHYSICS 21(2021). |
入库方式： OAI收割
来源：宁波材料技术与工程研究所
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