Visualization of Charge Migration in Conductive Polymers via Time-Resolved Electrostatic Force Microscopy
Visualization of Charge Migration in Conductive Polymers via Time-Resolved Electrostatic Force Microscopy
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通过时间分辨静电力显微镜观察导电聚合物中的电荷迁移
DOI：
10.1021/acs.jpca.9b12017
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发表时间：
2020
期刊：
影响因子：
--
通讯作者：
Matsumoto Takuya
中科院分区：
文献类型：
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作者：
Kajimoto Kentaro;Araki Kento;Usami Yuki;Ohoyama Hiroshi;Matsumoto Takuya
电荷动力学在许多自然现象和人工器件中起着重要作用，追踪电荷迁移和复合对于理解涉及电荷转移的系统的机制和功能至关重要。尖端同步泵探针静电力显微镜同时允许高灵敏度的检测，微秒级的时间分辨率，和纳米级的空间分辨率，其中在静态测量（通常EFM）的空间分布反映在载流子密度和时间演变的差异揭示了表面载流子迁移率。利用该方法对磺化聚苯胺（SPAN）薄膜的载流子注入和射出过程进行了可视化研究。对比不同掺杂浓度的SPAN薄膜的tr-EFM结果，揭示了载流子密度和迁移率的个体差异。
Charge dynamics play an important role in numerous natural phenomena and artificial devices, and tracking charge migration and recombination is crucial for understanding the mechanism and function of systems involving charge transfer. Tip-synchronized pump–probe electrostatic force microscopy simultaneously permits highly sensitive detection, microsecond time resolution, and nanoscale spatial resolution, where the spatial distribution in static measurement (usual EFM) reflects differences in the carrier density and the time evolution reveals the surface carrier mobility. By using this method, carrier injection and ejection in sulfonated polyaniline (SPAN) thin films were visualized. Comparison of tr-EFM results of SPAN thin films with different doping levels revealed the individual differences in carrier density and mobility.