Energy Level Alignment at the Fullerene/Titanium Oxide Ultrathin Film Interface

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• 作者：Michael Paßens ; Marco Moors ; Rainer Waser ; Silvia Karthäuser
• 刊名：Journal of Physical Chemistry C
• 出版年：2017
• 出版时间：February 9, 2017
• 年：2017
• 卷：121
• 期：5
• 页码：2815-2821
• 全文大小：397K
• ISSN：1932-7455

文摘

The performance of molecule based electronic devices can be improved by use of transition metal oxides (TMO) as charge injection buffer layers between electrodes and organic semiconductors. It is known that the appropriate energy level alignment at the molecule/TMO interface determines the efficiency of the respective TMO. Herein, scanning tunneling microscopy is employed to characterize the interface formed by fullerenes (C₆₀) deposited on a titanium oxide (TiO) ultrathin film, which is created by oxidation of a Pt₃Ti(111) surface. Individual C₆₀ are identified with orbital resolution, and the interfacial and intermolecular interactions are characterized in detail. Furthermore, the energy level alignment at the C₆₀/TiO ultrathin film interface is deduced based on scanning tunneling spectroscopy data. The results demonstrate that the C₆₀/TiO interface corresponds to a type-I heterojunction and, thus, is useful to decouple C₆₀ molecules from the metallic alloy surface.