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首页> 外文期刊>The journal of physical chemistry, A. Molecules, spectroscopy, kinetics, environment, & general theory >Femtosecond Transient Absorption Microscopy of Singlet Exciton Motion in Side-Chain Engineered Perylene-Diimide Thin Films
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Femtosecond Transient Absorption Microscopy of Singlet Exciton Motion in Side-Chain Engineered Perylene-Diimide Thin Films

机译：侧链工程翼二酰亚胺薄膜单线交激运动的飞秒瞬态吸收显微镜

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摘要

We present a statistical analysis of femtosecond transient absorption microscopy applied to four different organic semiconductor thin films based on perylene-diimide (PDI). By achieving a temporal resolution of 12 fs with simultaneous sub-10 nm spatial precision, we directly probe the underlying exciton transport characteristics within 3 ps after photoexcitation free of model assumptions. Our study reveals sub-picosecond coherent exciton transport (12-45 cm(2) s(-1)) followed by a diffusive phase of exciton transport (3-17 cm(2) s(-1)). A comparison between the different films suggests that the exciton transport in the studied materials is intricately linked to their nanoscale morphology, with PDI films that form large crystalline domains exhibiting the largest diffusion coefficients and transport lengths. Our study demonstrates the advantages of directly studying ultrafast transport properties at the nanometer length scale and highlights the need to examine nanoscale morphology when investigating exciton transport in organic as well as inorganic semiconductors.
机译：我们介绍了基于Perylene-二酰亚胺（PDI）的四种不同有机半导体薄膜的飞秒瞬态吸收显微镜的统计分析。通过同时分辨率为12 FS的时间分辨率，我们直接在3磅内直接在3磅内探测了在没有模型假设之后的3磅内。我们的研究揭示了亚皮秒相干激子输送（12-45厘米（2）s（-1）），然后是激子输送的衍射阶段（3-17厘米（2）s（-1））。不同薄膜之间的比较表明，所研究的材料中的激子输送与其纳米级形态复杂地相关，其具有形成大的晶域，其具有显示最大的扩散系数和传输长度的大晶域。我们的研究表明，直接在纳米长度尺度上研究超快传输性能并突出需要在有机和无机半导体中研究激子输送时检查纳米级形态的需要。

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