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Raman analysis of first monolayers of PTCDA on Ag(111)

机译:Ag(111)上PTCDA的第一单层的拉曼分析

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We present a Raman spectroscopic analysis of the bonding properties of organic molecules on Ag(111) surfaces as a model system for organic semiconductor/metal contacts. The planar molecule 3,4,9,10-perylene-tetracarboxylicacid-dianhydride (PTCDA) is used in the present study due to its high electronic mobility and thermal stability. Vibrational signatures of the first monolayer in direct contact with the metal, especially the modes at 1310 and 1575 cm~(-1), are found to be shifted to lower frequencies. First principles calculations result in corresponding mode patterns, which are essentially located in the centre of the i molecule thus indicating the area, where major metal interaction takes place. Furthermore, upon annealing at 450 K the vibrational frequencies of the second monolayer are modified with respect to bulk PTCDA, which reflect particular changes of the bonding situation of this layer. For subsequent layers bulk-like behaviour is observed.
机译:我们提出了有机分子在Ag(111)表面上的键合特性的拉曼光谱分析,作为有机半导体/金属接触的模型系统。平面分子3,4,9,10-per-四羧酸二酐(PTCDA)由于其高电子迁移率和热稳定性而用于本研究。与金属直接接触的第一单层的振动特征,尤其是在1310和1575 cm〜(-1)处的振型被移到了较低的频率。第一原理计算产生相应的模式模式,该模式模式基本上位于i分子的中心,从而指示发生主要金属相互作用的区域。此外,在450 K退火后,第二单层的振动频率相对于体PTCDA发生了变化,这反映了该层的粘结情况的特定变化。对于随后的层,观察到块状行为。

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