Time-resolved electrostatic force microscopy using tip-synchronized charge generation with pulsed laser excitation
Time-resolved electrostatic force microscopy using tip-synchronized charge generation with pulsed laser excitation
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DOI：
10.1038/s42005-019-0108-x
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发表时间：
2019-01-25
影响因子：
5.5
通讯作者：
Matsumoto, Takuya
中科院分区：
文献类型：
--
作者：
Araki, Kento;Le, Yutaka;Matsumoto, Takuya
在纳米尺度上观察电荷分布和电极化对于理解和控制功能材料和器件至关重要。特别是，电荷动力学的重要性是公认的，和直接的方法来观察电荷的产生，转移和重组过程是必需的。在这里，我们描述尖端同步时间分辨静电力显微镜。数值模拟澄清，尖端同步的方法提供了时间分辨率与悬臂振荡周期的时间尺度。这种方法使我们能够解决亚微秒电荷迁移的表面上。在双层有机光伏薄膜中的光激发载流子的复合被观察为具有0.3 μ s帧步长时间分辨率的电影。分析的图像表明，载流子的寿命是2.3 μ s附近的施主/受主界面。尖端同步方法增加了时间分辨静电力显微镜的范围，为纳米级电荷动力学的研究铺平了道路。
Nanoscale observation of charge distribution and electric polarization is crucial for understanding and controlling functional materials and devices. In particular, the importance of charge dynamics is well recognized, and direct methods to observe charge generation, transfer, and recombination processes are required. Here, we describe tip-synchronized time-resolved electrostatic force microscopy. Numerical modeling clarifies that the tip-synchronized method provides temporal resolution with the timescale of the cantilever oscillation cycle. This method enables us to resolve sub-microsecond charge migration on the surface. The recombination of photo-excited carriers in a bilayer organic photovoltaic thin film is observed as a movie with a 0.3 mu s frame step time resolution. Analysis of the images shows that the carrier lifetime is 2.3 mu s near the donor/acceptor interface. The tip-synchronized method increases the range of time-resolved electrostatic force microscopy, paving the way for studies of nanoscale charge dynamics.