论文标题
直接观察有机光收集系统中的电荷分离，飞秒时间分辨XPS
Direct observation of charge separation in an organic light harvesting system by femtosecond time-resolved XPS
论文作者
论文摘要
通过自由电机激光闪光灯的飞秒时间分辨X射线光发射光谱（TR-XP）研究了有机光收集系统中光子到电荷转换的超快动力学。这种新颖的实验技术提供了有关电荷分离的特定地点信息，并可以在其自然时间尺度上监视自由载体生成动力学，此处将其应用于模型供体 - 受体系统CUPC：C $ _ {60} $。确定了先前未观察到的激子分离为移动电荷载体的通道，从而提供了从有机异质结中低能量电荷转移状态的电荷产生时间尺度和电荷产生效率的第一个直接实时表征。这些发现为新兴的认识提供了强有力的支持，即即使是从能量不利的激子状态中，电荷分离也在显着贡献，这表明有机异质界的光收集新选择。
The ultrafast dynamics of photon-to-charge conversion in an organic light harvesting system is studied by femtosecond time-resolved X-ray photoemission spectroscopy (TR-XPS) at the free-electron laser FLASH. This novel experimental technique provides site-specific information about charge separation and enables the monitoring of free charge carrier generation dynamics on their natural timescale, here applied to the model donor-acceptor system CuPc:C$_{60}$. A previously unobserved channel for exciton dissociation into mobile charge carriers is identified, providing the first direct, real-time characterization of the timescale and efficiency of charge generation from low-energy charge-transfer states in an organic heterojunction. The findings give strong support to the emerging realization that charge separation even from energetically disfavored excitonic states is contributing significantly, indicating new options for light harvesting in organic heterojunctions.
