Katayama Kenji
Department of Applied Chemistry, Chuo University, Tokyo 112-8551, Japan and PRESTO, Japan Science and Technology Agency (JST), Saitama 332-0012, Japan.
J Chem Phys. 2020 Aug 7;153(5):054201. doi: 10.1063/5.0009312.
A nanosecond time-resolved imaging technique has been developed for the observation of the photo-excited charge carrier dynamics in photo-devices such as photocatalysts and solar cells. An arbitrary spatial pattern of pump pulse light excites the charge carriers, which are observed by phase-contrast imaging. This patterned excitation is preferable for various statistical image reconstruction techniques based on robust principal component analysis and the least absolute shrinkage and selection operator, which helped the enhancement of the signal-to-noise ratio and the removal of unwanted image components. By using data assimilation with the charge decay model, the lifetime and diffusion coefficients were mapped for the photo-excited electrons in a nano-particulate titanium oxide film and other photo-device materials.
已开发出一种纳秒时间分辨成像技术，用于观察光催化剂和太阳能电池等光电器件中光激发电荷载流子的动力学。泵浦脉冲光的任意空间图案激发电荷载流子，通过相衬成像对其进行观察。这种图案化激发对于基于稳健主成分分析以及最小绝对收缩和选择算子的各种统计图像重建技术而言是优选的，这有助于提高信噪比并去除不需要的图像成分。通过将数据同化与电荷衰减模型相结合，绘制了纳米颗粒氧化钛薄膜和其他光电器件材料中光激发电子的寿命和扩散系数。
