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arXiv 1503.05353cond-mat.mtrl-sci
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有机光化学中电荷转移动力学的定点探测

Site-specific probing of charge transfer dynamics in organic photovoltaics

Tiberiu Arion, Stefan Nepp, Friedrich Roth, Andrey Shavorskiy, Hendrik Bluhm, Zahid Hussain, Oliver Gessner, Wolfgang Eberhardt

摘要:

本文报道了利用皮秒时间分辨X射线光电子能谱学对有机光致发光(OPV)原型系统中电荷转移动力学的定点探测。由沉积在铜-酞菁(CuPC)的薄膜的顶部上的大约两个单层的C $_{60}$组成的分层系统由光泵浦脉冲激发,并且用590 eV的X射线脉冲探测诱导的电子动力学。通过记录该体系随时间变化的C1 $s$芯能级光电子能谱,监测了从电子给体(CuPC)到受体(C $_{60}$)的电荷转移和随后的载流子动力学.电子到达C $_{60}$层中容易观察到C $_{60}$相关的C1 $s$核心能级的完全可逆的瞬态位移,而CuPC的C1 $s$能级保持不变。直接在时域和从明确定义的域的角度探测OPV组件中的电荷转移和重组动力学的能力预计将开辟额外的途径,以更好地理解和优化这种新兴技术的性能。

英文摘要:

We report the site-specific probing of charge-transfer dynamics in a prototype system for organic photovoltaics (OPV) by picosecond time-resolved X-ray photoelectron spectroscopy. A layered system consisting of approximately two monolayers of C$_{60}$ deposited on top of a thin film of Copper-Phthalocyanine (CuPC) is excited by an optical pump pulse and the induced electronic dynamics are probed with 590 eV X-ray pulses. Charge transfer from the electron donor (CuPC) to the acceptor (C$_{60}$) and subsequent charge carrier dynamics are monitored by recording the time-dependent C 1$s$ core level photoemission spectrum of the system. The arrival of electrons in the C$_{60}$ layer is readily observed as a completely reversible, transient shift of the C$_{60}$ associated C 1$s$ core level, while the C 1$s$ level of the CuPC remains unchanged. The capability to probe charge transfer and recombination dynamics in OPV assemblies directly in the time domain and from the perspective of well-defined domains is expected to open additional pathways to better understand and optimize the performance of this emerging technology.

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