Department of Chemistry, University of Washington, Seattle, Washington 98195, United States.
Department of Biomedical Engineering, Southern University of Science and Technology, Shenzhen, Guangdong 518055, China.
Nano Lett. 2021 May 26;21(10):4255-4261. doi: 10.1021/acs.nanolett.1c00405. Epub 2021 Mar 18.
Here, we developed a novel, multimode superresolution method to perform full-scale structural mapping and measure the energy landscape for single carrier transport along conjugated polymer nanowires. Through quenching of the local emission, the motion of a single photogenerated hole was tracked using blinking-assisted localization microscopy. Then, utilizing binding and unbinding dynamics of quenchers onto the nanowires, local emission spectra were collected sequentially and assembled to create a superresolution map of emission sites throughout the structure. The hole polaron trajectories were overlaid with the superresolution maps to correlate structures with charge transport properties. Using this method, we compared the efficiency of inter- and intrachain hole transport inside the nanowires and for the first time directly measured the depth of carrier traps originated from torsional disorder and chemical defects.
在这里，我们开发了一种新颖的多模式超分辨率方法，以对单个载流子沿共轭聚合物纳米线的输运进行全尺度结构映射和能量景观测量。通过局部发射的猝灭，利用闪烁辅助定位显微镜跟踪单个光生空穴的运动。然后，利用猝灭剂在纳米线上的结合和解离动力学，依次收集局部发射光谱并组装，以在整个结构中创建发射位点的超分辨率图谱。将空穴极化子轨迹与超分辨率图谱叠加，将结构与电荷输运性质相关联。使用这种方法，我们比较了纳米线内和链间空穴输运的效率，并首次直接测量了源于扭转无序和化学缺陷的载流子陷阱的深度。
