Anomalous Charge Carrier Decay Spotted by Clustering of a Time-Resolved Microscopic Phase Image Sequence,The Journal of Physical Chemistry C

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Anomalous Charge Carrier Decay Spotted by Clustering of a Time-Resolved Microscopic Phase Image Sequence
The Journal of Physical Chemistry C ( IF 3.3 ) Pub Date : 2020-10-19 , DOI: 10.1021/acs.jpcc.0c07609
Makoto Ebihara ₁ , Kenji Katayama ₁

Affiliation

We have developed a new type of time-resolved phase microscope through which the dynamics of photo-excited charge carriers at local positions are visualized by a refractive index change. To categorize the charge carrier responses at local positions, we introduced a classification method for all of the local temporal responses based on their similarity (cluster analysis). We analyzed the local responses for a nanoparticulate-TiO₂ film. By categorizing the charge carrier responses for different positions, the categories of the temporal responses were mapped out. Although the average responses of photo-excited charge carriers were caused by recombination processes, we found a spotty fast decay response (50 ± 10 ns), which could not be recognized after averaging in space. The process was assigned as the formation and nonradiative decay of self-trapped excitons. The clustering mapping of the charge carrier responses could reveal the local charge dynamics, which may not be recognized otherwise.

中文翻译：

通过时间分辨的微观相位图像序列的聚类发现异常的载流子衰减

我们已经开发了一种新型的时间分辨相显微镜，通过该显微镜，可以通过折射率的变化可视化局部位置的光激发电荷载流子的动力学。为了对在本地位置的载流子响应进行分类，我们基于它们的相似性为所有本地时间响应引入了分类方法（聚类分析）。我们分析了纳米颗粒-TiO ₂的局部响应电影。通过对不同位置的载流子响应进行分类，可以绘制出时间响应的类别。尽管光激发电荷载流子的平均响应是由重组过程引起的，但我们发现了斑点快速衰变响应（50±10 ns），在空间平均后无法识别。该过程被指定为自陷激子的形成和非辐射衰减。电荷载流子响应的聚类映射可以揭示局部电荷动态，否则可能无法识别。

更新日期：2020-10-30

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