Initial Growth of Lutetium(III) Bis-phthalocyanine on Ag(111) Surface

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• 作者：Marius Toader ; Martin Knupfer ; Dietrich R. T. Zahn ; Michael Hietschold
• 刊名：Journal of the American Chemical Society
• 出版年：2011
• 出版时间：April 13, 2011
• 年：2011
• 卷：133
• 期：14
• 页码：5538-5544
• 全文大小：957K
• 年卷期：v.133,no.14(April 13, 2011)
• ISSN：1520-5126

文摘

The adsorption of lutetium(III) bis-phthalocyanine (LuPc₂) on Ag(111) was investigated using scanning tunneling microscopy and spectroscopy (STM/STS). A comprehensive study was carried out toward understanding the driving mechanism responsible for the formation of the first and second monolayers (MLs). In both MLs, the adsorbed molecules are found to exhibit different in-plane orientations arranged according to a 鈥渃hess-board鈥?like pattern. Highly resolved STM images allowed an exact determination of the corresponding angle mismatch, which differs for the first and second MLs. The tunneling transport through individual molecules reveals a negative differential resistance (NDR) effect detectable within the current鈭抳oltage curves. The corresponding density of states (DOS) representation is consistent with a resonant tunneling mechanism sustained by the valence band (VB) states close to the Fermi energy (E_F) recorded via highly resolved ultraviolet photoemission spectroscopy (UPS).