论文标题
单个分子在射频腔中的激子曲线动力学
Exciton-trion dynamics of a single molecule in a radio-frequency cavity
论文作者
论文摘要
电荷载体注入产生的带电光激励（TRIONS）对于可以通过电场生产和操纵的新兴光电技术至关重要。通过尖端增强的光谱技术，可以在单分子中有效诱导TRIONS和中性激子。然而，几乎不知道单分子水平的激子 - 轨道动力学，因为这需要允许同时进行亚纳米表和亚纳秒表征的方法。在这里，我们通过相荧光测定法研究了激子 - 曲线动力学，将射频调制扫描隧道发光与时间分辨的单光子检测结合在一起。我们在NaCl/ag（111）上生成激子和Trions和Trions，确定它们的动力学，并通过原子分辨率确定其动力学并追踪系统的演化。此外，我们探索有效寿命对偏置电压的依赖性，并通过电荷捕获作为Trion形成的主要机制将中性激子转化为Trions。
Charged optical excitations (trions) generated by charge carrier injection are crucial for emerging optoelectronic technologies as they can be produced and manipulated by electric fields. Trions and neutral excitons can be efficiently induced in single molecules by means of tip-enhanced spectromicroscopic techniques. However, little is known of the exciton-trion dynamics at single molecule level as this requires methods permitting simultaneous sub-nanometer and sub-nanosecond characterization. Here, we investigate exciton-trion dynamics by phase fluorometry, combining radio-frequency modulated scanning tunnelling luminescence with time-resolved single photon detection. We generate excitons and trions in single Zinc Phthalocyanine (ZnPc) molecules on NaCl/Ag(111), determine their dynamics and trace the evolution of the system in the picosecond range with atomic resolution. In addition, we explore dependence of effective lifetimes on bias voltage and propose a conversion of neutral excitons into trions via charge capture as the primary mechanism of trion formation.
