Exciton Dissociation and Electron Transfer at a Well-Defined Organic Interface of an Epitaxial C60 Layer on a Pentacene Single Crystal
Exciton Dissociation and Electron Transfer at a Well-Defined Organic Interface of an Epitaxial C60 Layer on a Pentacene Single Crystal
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DOI：
10.1021/acs.jpcc.0c02796
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发表时间：
2020-06-25
影响因子：
3.7
通讯作者：
Yamada, Yoichi
中科院分区：
文献类型：
--
作者：
Iwasawa, Masato;Tsuruta, Ryohei;Yamada, Yoichi
用时间分辨光电子显微镜（TR-PEEM）观察了单晶并五苯（Pen-SC）表面C-60外延层的有机P-N界面的电子转移。除了光电子的PEEM检测之外，探测光的精细能量调谐和光电子的选定区域检测允许测量具有高信噪比的相当绝缘的有机界面的电子的动态，而不遭受样品的充电。在确定Pen-SC中的光生电子经由单重态裂变通过多激子态的弛豫之后，通过直接检测C-60的LUMO中的电子的时间演化，清楚地观察到两个不同的电子转移到C-60层的LUMO的过程。
The electron transfer of a well-defined single-crystalline organic P-N interface of the epitaxial layer of C-60 on the surface of a single-crystalline pentacene (Pen-SC) was observed using time-resolved photoemission electron microscopy (TR-PEEM) with an optical pump and probe mode. The fine energy-tuning of the probe light and the selected-area detection of the photoelectrons, in addition to the PEEM detection of photoelectrons, allowed the measurement of the dynamics of electrons of rather insulating organic interfaces with a high signal-to-noise ratio, without suffering from the charging of the sample. After determination of the relaxation of the photogenerated electrons in Pen-SC via singlet fission through multiple-exciton states, two distinct electron transfer processes to the LUMO of the C-60 layer were clearly observed by direct detection of the time evolution of the electrons in the LUMO of C-60.