标题： 解析纳米复合材料中载流子的超快动力学 显示英文标题

标题： Resolving the ultrafast dynamics of charge carriers in nanocomposites

摘要： 这里我们描述了一种光学方法，用于确定纳米结构复合样品中光激发载流子的动力学行为。 通过结合泵浦-探测时间分辨反射率与散射测量，我们提取了电荷载流子演化的特征时间。 我们使用修改后的三维Maxwell-Garnett公式，该公式包含Drude光学响应，以模拟结果。 该方法应用于含有晶体硅纳米颗粒的氢化非晶硅，结果显示纳米晶体和基质中的复合时间分别为约4.9 ps和22 ps。 晶体与基质之间的电荷转移时间为约4 ps。 显示英文摘要

摘要： Here we describe an optical method to determine the dynamics of optically excited carriers in nanostructured composite samples. By combining pump-probe time-resolved reflectivity with scattering measurements, we extract the characteristic times for charge carrier evolution. We use the 3D Maxwell-Garnett formulae, modified to include the Drude optical response, to model the results. The method, applied to hydrogenated amorphous silicon containing crystalline silicon nanoparticles, showed that the recombination times in the nanocrystals and in the matrix were ~4.9 ps and ~22 ps, respectively. The charge transfer time between the crystals and the matrix was ~4 ps.