分子光源中电荷注入动力学的千兆赫帧频成像
Gigahertz frame rate imaging of charge-injection dynamics in a molecular light source
摘要：
单分子尺度的光源可以通过扫描隧道显微镜诱导发光（STML）在其适当的亚纳米尺度上进行寻址和表征。这样的源可以由限定的短电荷脉冲驱动，同时以亚纳秒分辨率检测发光。我们介绍了一种方法，同时图像的分子发射器，这是基于一个单独的缺陷，其局部环境，随着其发光动力学在一个十亿帧每秒的分辨率。所观察到的动力学可以被分配到发生在低纳秒制度的单电子捕获。当发射体在表面上的位置保持固定时，尖端的扫描修改了用于向缺陷注入电荷的能量景观。测量原理可扩展到电荷转移以外的基本过程，如激子扩散。
英文摘要：
Light sources on the scale of single molecules can be addressed and characterized on their proper sub-nanometer scale by scanning tunneling microscopy induced luminescence (STML). Such a source can be driven by defined short charge pulses while the luminescence is detected with sub-nanosecond resolution. We introduce an approach to concurrently image the molecular emitter, which is based on an individual defect, with its local environment along with its luminescence dynamics at a resolution of a billion frames per second. The observed dynamics can be assigned to the single electron capture occurring in the low-nanosecond regime. While the emitter's location on the surface remains fixed, the scanning of the tip modifies the energy landscape for charge injection to the defect. The principle of measurement is extendable to fundamental processes beyond charge transfer like exciton diffusion.
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