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Intrinsic nonradiative recombination in ensembles of silicon nanocrystals

机译：硅纳米晶体集合体的本征非辐射复合

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摘要

A detailed time-resolved photoluminescence (TRPL) and continuous wave photoluminescence (CWPL) study as a function of the silicon nanocrystal (Si NC) size and the sample temperature is presented on size-controlled Si NCs fabricated by plasma-enhanced chemical vapor deposition. From the T-dependent TRPL measurements, a model for the radiative as well as for the nonradiative decay processes in Si NCs is established. With the fitting parameters extracted from this model applied to the T-dependent TRPL data, it is possible to reproduce the T-dependent photoluminescence (PL) intensity obtained for different Si NC sizes from CWPL measurements very well. This allows for the description of the PL properties of Si NCs over the whole temperature range and supports correctness of the theoretical assumptions. Furthermore, a detailed discussion on the basis of the theoretical model about the mechanisms behind the nonradiative decay is provided, assuming a temperature activated creation of nonradiative pathways.
机译：详细介绍了时间分辨光致发光（TRPL）和连续波光致发光（CWPL）作为硅纳米晶体（Si NC）尺寸和样品温度的函数的研究，该研究在通过等离子体增强化学气相沉积制备的尺寸受控的Si NC上进行了介绍。通过T依赖的TRPL测量，建立了Si NCs中辐射和非辐射衰变过程的模型。通过将从该模型中提取的拟合参数应用于T依赖的TRPL数据，可以很好地再现从CWPL测量获得的针对不同Si NC尺寸的T依赖的光致发光（PL）强度。这可以描述整个温度范围内Si NC的PL特性，并支持理论假设的正确性。此外，在理论模型的基础上，提供了有关非辐射衰减背后机理的详细讨论，假设温度激活了非辐射路径的产生。

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  • 来源
    《Physical review》 |2013年第3期|035428.1-035428.7|共7页
  • 作者

    A. M. Hartel; S. Gutsch; D. Hiller; M. Zacharias;

  • 作者单位

    IMTEK, Faculty of Engineering, Albert-Ludwigs-University Freiburg, Georges-Koehler-Allee 103, 79110 Freiburg, Germany;

    IMTEK, Faculty of Engineering, Albert-Ludwigs-University Freiburg, Georges-Koehler-Allee 103, 79110 Freiburg, Germany;

    IMTEK, Faculty of Engineering, Albert-Ludwigs-University Freiburg, Georges-Koehler-Allee 103, 79110 Freiburg, Germany;

    IMTEK, Faculty of Engineering, Albert-Ludwigs-University Freiburg, Georges-Koehler-Allee 103, 79110 Freiburg, Germany;

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  • 正文语种 eng
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  • 关键词

    nanocrystals and nanoparticles; nanocrystalline materials;

    机译：纳米晶体和纳米颗粒;纳米晶材料;

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