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Electronic states and optical properties of PbSe nanorods and nanowires

机译:PbSe纳米棒和纳米线的电子态和光学性质

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摘要

A theory of the electronic-structure and excitonic absorption spectra of PbS and PbSe nanowires and nanorods in the framework of a four-band effective-mass model is presented. Calculations conducted for PbSe show that dielectric contrast dramatically strengthens the exciton binding in narrow nanowires and nanorods. However, the self-interaction energies of the electron and hole nearly cancel the Coulomb binding, and as a result the optical absorption spectra are practically unaffected by the strong dielectric contrast between PbSe and the surrounding medium. Measurements of the size-dependent absorption spectra of colloidal PbSe nanorods are also presented. Using room-temperature energy-band parameters extracted from the optical spectra of spherical PbSe nanocrystals, the theory provides good quantitative agreement with the measured spectra.
机译:提出了在四波段有效质量模型的框架下,PbS,PbSe纳米线和纳米棒的电子结构和激子吸收光谱的理论。对PbSe进行的计算表明,介电对比显着增强了窄纳米线和纳米棒中激子的结合。但是,电子和空穴的自相互作用能几乎抵消了库仑结合,因此,光吸收光谱实际上不受PbSe与周围介质之间强介电对比度的影响。还介绍了对胶体PbSe纳米棒的尺寸依赖性吸收光谱的测量。使用从球形PbSe纳米晶体的光谱中提取的室温能带参数,该理论提供了与测量光谱的良好定量一致性。

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  • 来源
    《Physical review》 |2010年第19期|p.195313.1-195313.16|共16页
  • 作者单位

    Applied Physics Department, Cornell University, Ithaca, New York 14853, USA;

    Naval Research Laboratory, Washington, DC 20375, USA;

    Department of Chemistry, University of Pennsylvania, Philadelphia, Pennsylvania 19104, USA;

    Department of Chemistry, University of Pennsylvania, Philadelphia, Pennsylvania 19104, USA,Department of Materials Science and Engineering, University of Pennsylvania, Philadelphia, Pennsylvania 19104, USA;

    Applied Physics Department, Cornell University, Ithaca, New York 14853, USA;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    quantum wells; single particle states; quantum wires;

    机译:量子阱单粒子态量子线;

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