...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Advanced Materials >Band Engineering of the Second Phase to Reach High Thermoelectric Performance in Cu_2Se-Based Composite Material
【24h】

Band Engineering of the Second Phase to Reach High Thermoelectric Performance in Cu_2Se-Based Composite Material

机译：Band Engineering of the Second Phase to Reach High Thermoelectric Performance in Cu_2Se-Based Composite Material

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相关主题

摘要

Hitherto, Cu_2Se incorporated with a dispersed second phase shows extremelylow thermal conductivity and excellent thermoelectric properties. However,the significant mismatch in electronic band structure between the secondphases and the matrix often causes a deterioration of carrier mobility. In thiswork, based on density functional theory (DFT) calculations, the electronicband structure of the second phase is adjusted through doping S and Te. It isfound that Cu_2Se_(0.88)S_(0.06)Te_(0.06) has a highly similar electronic band structureto the Cu_2Se matrix, which results in high carrier mobility and power factor inCu_2Se-based composite materials. Additionally, the dispersed second-phaseCu_2Se_(0.88)S_(0.06)Te_(0.06), dislocations, and nanograins are observed in the Cu_2Se/5wt Cu_2Se_(0.88)S_(0.06)Te_(0.06) product, which leads to a substantial reduction inthe thermal conductivity. Finally, high figure of merit (zT) values of 2.04 (byDulong–Petit heat capacity) and 2.34 (by Differential Scanning Calorimetry(DSC) measured heat capacity) are achieved at 850 K, which are about65 higher than that of Cu_2Se in this work and comparable to the recentlyreported p-type Cu_2Se with outstanding performance.

著录项

获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号