Molecular Ion Formation by Photoinduced Electron Transfer at the Tetracyanoquinodimethane/Au(111) Interface,The Journal of Physical Chemistry Letters

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Molecular Ion Formation by Photoinduced Electron Transfer at the Tetracyanoquinodimethane/Au(111) Interface
The Journal of Physical Chemistry Letters ( IF 4.8 ) Pub Date : 2017-09-15 00:00:00 , DOI: 10.1021/acs.jpclett.7b01897
David Gerbert ₁ , Petra Tegeder ₁

Affiliation

Optically induced processes in organic materials are essential for light harvesting, switching, and sensor technologies. Here we studied the electronic properties of the tetracyanoquinodimethane(TCNQ)/Au(111) interface by using two-photon photoemission spectroscopy. For this interface we demonstrated the lack of charge-transfer interactions, but we found a significant increase in the sample work function due to UV-light illumination, while the electronic structure of the TCNQ-derived states remain unaffected. Thereby the work function of the interface can be tuned over a wide range via the photon dose. We assigned this to a photoinduced metal-to-molecule electron transfer creating negative ions. The electrons are bound by a small potential barrier. Thus thermal activation reverses the process resulting in the original work function value. The presented photoinduced charge transfer at the TCNQ/Au(111) interface can be used for continuous work function tuning across the substrate’s work function, which can be applied in device-adapted hole-injection layers or organic UV-light sensors.

中文翻译：

Tetracyanoquinodimethane / Au（111）界面上的光诱导电子转移形成分子离子

有机材料中的光诱导过程对于光收集，转换和传感器技术至关重要。在这里，我们通过使用双光子光发射光谱学研究了四氰基喹二甲烷（TCNQ）/ Au（111）界面的电子性质。对于该界面，我们证明了电荷转移相互作用的缺乏，但是我们发现由于紫外光照射，样品功函数显着增加，而TCNQ衍生态的电子结构保持不受影响。因此，可以通过光子剂量在很宽的范围内调整界面的功函数。我们将此归因于光诱导的金属到分子的电子转移，产生负离子。电子被一个小的势垒所束缚。因此，热激活使过程逆转，从而产生原始功函数值。

更新日期：2017-09-15

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