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相关概念视频

Energy Bands in Solids01:01

Energy Bands in Solids

Isolated atoms have discrete energy levels that are well described by the Bohr model. And, it quantifies the energy of an electron in a hydrogen atom as En. Higher quantum numbers 'n' yield less negative, closer electron energy levels.
 Band Formation:
When atoms are brought close together, as in a solid, these discrete energy levels begin to split due to the overlap of electron orbitals from adjacent atoms. This split occurs because of the Pauli exclusion principle, which states that no two...

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Fabricating Nanogaps by Nanoskiving
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在单合金纳米线上进行空间带隙工程.

Fuxing Gu1, Zongyin Yang, Huakang Yu

  • 1State Key Laboratory of Modern Optical Instrumentation, Department of Optical Engineering, Zhejiang University, Hangzhou 310027, China.

Journal of the American Chemical Society
|January 29, 2011
PubMed
概括

研究人员通过控制从硫化 (CdS) 到化 (CdSe) 的组成来设计具有可调节带隙的半导体纳米线. 这种空间带隙工程可以为先进的光电子应用程序逐渐调节光辐射.

科学领域:

  • 材料科学 材料科学 材料科学
  • 纳米技术纳米技术
  • 光电学是指光电子产品.

背景情况:

  • 半导体纳米线的带隙工程对于开发先进的纳米级光电子设备至关重要.
  • 控制合金纳米线的组成允许定制的电子和光学性能.

研究的目的:

  • 在单一硫化物 (CdS) 和化物 (CdSe) 合金纳米线中展示空间带隙工程的简单方法.
  • 为了在纳米线长度上实现连续的组合调整,从而产生带隙和辐射波长的梯度.

主要方法:

  • 使用一种简单的热蒸发方法合成CdS(1-x) Se(x) 合金纳米线.
  • 沿着纳米线实现了对组合 (x) 的空间控制,从x=0 (CdS) 到x=1 (CdSe) 变化.

主要成果:

  • 成功创建了单个CdS(1-x) Se(x) 合金纳米线,其组成沿其长度连续调整.
  • 从2.44 eV (507 nm,绿光) 到1.74 eV (710 nm,红光) 的带隙的逐渐调制.
  • 在多色纳米线中观察到高质量的结晶,尽管成分梯度.

结论:

  • 开发的方法可以在半导体纳米线中实现精确的空间带隙工程.

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  • 这些渐变带隙纳米线具有在多色显示器,照明,太阳能电池,探测器和生物技术中应用的巨大潜力.