Ionization Energy and Energy Gap Structure of MoSI Molecular Wires: Kelvin Probe, Ultraviolet Photoelectron Spectroscopy, and Cyclic Voltammetry Measurements

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• 作者：Martin Strojnik ; Ales Omerzu ; Aleksej Majkic虂 ; Peter M. Mihailovic ; Junos Lukan ; Gregor Bavdek ; Gvido Bratina ; Dean Cvetko ; Peter Topolovsek ; Dragan Mihailovic
• 刊名：Langmuir
• 出版年：2011
• 出版时间：April 19, 2011
• 年：2011
• 卷：27
• 期：8
• 页码：4296-4299
• 全文大小：716K
• 年卷期：v.27,no.8(April 19, 2011)
• ISSN：1520-5827

文摘

The work function W of Mo₆S₃I₆ molecular nanowires is determined by Kelvin probe (KP) measurements, UV photoelectron spectroscopy (UPS), and cyclic voltammetry (CV). The values obtained by all three methods agree well, giving W = 4.8 卤 0.1 eV. CV measurements also give a gap between the highest occupied molecular orbital (HOMO) and lowest unoccupied molecular orbital (LUMO) of E_g = 1.2 卤 0.1 eV, in agreement with recent optical measurements, but in disagreement with theoretical calculations, which predict the material to be a metal. The electronic structure of Mo₆S₃I₆ suggests use of the material in applications such as bulk heterostructure photovoltaics and transparent electrodes and for molecular electronics devices.