Resolving the ultrafast dynamics of charge carriers in nanocomposites

被引：11

作者：

Barreto, J. ^{[1
]}

Roger, T. ^{[1
]}

Kaplan, A. ^{[1
]}

机构：

[1] Univ Birmingham, Sch Phys & Astron, Nanoscale Phys Res Lab, Birmingham B15 2TT, W Midlands, England

来源：

APPLIED PHYSICS LETTERS | 2012年 / 100卷 / 24期

基金：

英国工程与自然科学研究理事会;

关键词：

NANOSTRUCTURED MATERIALS; SILICON; PLASMAS; PULSES; SI;

D O I：

10.1063/1.4728120

中图分类号：

O59 [应用物理学];

学科分类号：

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 similar to 4.9 ps and similar to 22 ps, respectively. The charge transfer time between the crystals and the matrix was similar to 4 ps. (C) 2012 American Institute of Physics. [http://dx.doi.org/10.1063/1.4728120]

引用

页数：4

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