Interaction at the F16CuPc/TiO2 Interface: A Photoemission and X-ray Absorption Study

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• 作者：Sumona Sinha ; A. K. M. Maidul Islam ; Mykhailo Vorokhta ; Manabendra Mukherjee
• 刊名：Journal of Physical Chemistry C
• 出版年：2017
• 出版时间：February 16, 2017
• 年：2017
• 卷：121
• 期：6
• 页码：3365-3372
• 全文大小：485K
• ISSN：1932-7455

文摘

The interfacial interaction and charge transfer dynamics between a F₁₆CuPc molecular thin film and rutile TiO₂(110) (1×1) surface have been studied by photoelectron spectroscopy (PES), near-edge X-ray absorption fine structure (NEXAFS) spectroscopy, and resonant photoemission spectroscopy (RPES). The evolution of PES spectra as a function of F₁₆CuPc film thickness shows strong coupling between the molecules and the TiO₂ surface. Adsorbed molecules experience substrate mediated charge transfer. Electrons being pulled away from nitrogen atoms toward to carbon ring results in an opposite direction binding energy shift for C 1s and N 1s. Moreover, the molecule gets deformed due to their strong interaction with the TiO₂ surface. Ultrafast charge transfer from F₁₆CuPc molecules to the TiO₂ substrate takes place on the time scale of 10 fs due to their strong electronic coupling. The results pave the way for the design and realization of F₁₆CuPc based electronic devices.