• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Nanotechnology >The influence of a Te-depleted surface on the thermoelectric transport properties of Bi_2Te_3 nanowires
【24h】

The influence of a Te-depleted surface on the thermoelectric transport properties of Bi_2Te_3 nanowires

机译：贫Te表面对Bi_2Te_3纳米线热电输运性能的影响

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

摘要

We report on thermoelectric transport measurements along the basal plane of several individual, single-crystalline Bi2Te3 nanowires (NWs) with different cross-sectional areas, grown by a vapor-liquid-solid method. Lithographically defined microdevices allowed us to determine the Seebeck coefficient S, electrical conductivity σ, and thermal conductivity κ of individual NWs. The NWs studied show near intrinsic transport properties with low electrical conductivities of around σ = (3.2 ± 0.9) × 10~4 Ω~(-1) m~(-1) at room temperature. We observe a transition of the Seebeck coefficient from positive to negative values (S = +133 μVK~(-1) to S = -87 μVK~(-1)) with increasing surface-to-volume ratio at room temperature, which can be explained by the presence of an approximately 5 nm thick Te-depleted layer at the surface of the NWs. The thermal conductivities of our NWs are in the range of κ = (1.4 ± 0.4)Wm~(-1) K~(-1) at room temperature, which is lower than literature values for bulk Bi_2Te_3. We attribute this suppression in thermal conductivity to enhanced scattering of phonons at the surface of the NWs. Despite their reduced thermal conductivities, the NWs investigated only show a moderate figure of merit between 0.02 and 0.18 due to their near intrinsic transport properties.
机译：我们报告了沿几条单独的单晶Bi2Te3纳米线（NWs）的基面进行的热电传输测量，这些纳米线通过气液固方法生长。通过光刻定义的微型设备使我们能够确定各个NW的塞贝克系数S，电导率σ和热导率κ。所研究的NWs在室温下具有接近固有的传输特性，具有低电导率，约为σ=（3.2±0.9）×10〜4Ω〜（-1）m〜（-1）。我们观察到在室温下塞贝克系数从正值到负值（S = +133μVK〜（-1）到S = -87μVK〜（-1））的跃迁随着表面体积比的增加而增加可以通过在NW的表面存在约5 nm厚的Te耗尽层来解释。我们的净水在室温下的热导率在κ=（1.4±0.4）Wm〜（-1）K〜（-1）的范围内，低于大量Bi_2Te_3的文献报道值。我们将这种热导率的抑制归因于声子在NWs表面的增强散射。尽管它们的热导率降低了，但由于它们的近乎固有的传输特性，所以所研究的NW仅显示出0.02至0.18的中等品质因数。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
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