Molecular Orientation and Site Dependent Charge Transfer Dynamics at PTCDA/TiO2(110) Interface Revealed by Resonant Photoemission Spectroscopy
The Journal of Physical Chemistry C2014Vol. 118(8), pp. 4160–4166
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Liang Cao, Yuzhan Wang, Jian‐Qiang Zhong, Yu-Yan Han, Wenhua Zhang, Xiaojiang Yu, Faqiang Xu, Dongchen Qi, Andrew T. S. Wee
Abstract
Charge transfer dynamics across the interface of 3,4,9,10-perylenetetracarboxylic dianhydride (PTCDA) organic molecules and the reduced rutile TiO2 (110) 1 × 1 surface has been investigated using core-hole clock implementation of resonant photoemission spectroscopy (RPES). It is found that ultrafast charge transfer from PTCDA molecules to TiO2 substrate takes place on the time scale of 8–20 fs due to their strong electronic coupling. Moreover, the charge transfer time scale at the PTCDA/TiO2 (110) interface shows evident orientational dependence which varies with the molecular site owing to different electronic coupling strengths.
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