Institute of Physical Chemistry, University of Hamburg, 20146 Hamburg, Germany.
ACS Nano. 2011 Oct 25;5(10):7920-7. doi: 10.1021/nn202199f. Epub 2011 Aug 29.
The diameter dependence of the optical band gap of single CdSe nanowires (NWs) is investigated by a combination of atomic force microscopy, scanning fluorescence microscopy, and transmission electron microscopy. We find a good congruence of the experimental data to calculations within the effective mass approximation taking into account quantization, exciton Coulomb interaction, and dielectric mismatch. The experimental data are furthermore compared to different theoretical approaches. We discuss the influence of alternating wurtzite and zinc blende segments along the NWs on their optical properties.
我们通过原子力显微镜、扫描荧光显微镜和透射电子显微镜的组合，研究了单个 CdSe 纳米线（NWs）的光学带隙随直径的变化关系。我们发现，考虑到量子化、激子库仑相互作用和介电失配，有效质量近似中的实验数据与计算结果非常吻合。此外，我们还将实验数据与不同的理论方法进行了比较。我们讨论了 NWs 中沿其生长的纤锌矿和闪锌矿段的交替对其光学性质的影响。
