Two-Photon Photoemission of Ultrathin Film PTCDA Morphologies on Ag(111)

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• 作者：Aram Yang ; Steven T. Shipman ; Sean Garrett-Roe ; James Johns ; Matt Strader ; Paul Szymanski ; Eric Muller ; Charles Harris
• 刊名：Journal of Physical Chemistry C
• 出版年：2008
• 出版时间：February 21, 2008
• 年：2008
• 卷：112
• 期：7
• 页码：2506 - 2513
• 全文大小：359K
• 年卷期：v.112,no.7(February 21, 2008)
• ISSN：1932-7455

文摘

Morphology- and layer-dependent electronic structure and dynamics at the PTCDA/Ag(111) interface havebeen studied with angle-resolved two-photon photoemission. In Stranski-Krastanov growth modes, the exposedwetting layer inhibited the evolution of the vacuum level and valence band to bulk values. For layer-by-layergrowth, we observed the transition of electron structure from monolayer to bulk values within eight monolayers.Effective masses and lifetimes of the conduction band and the n = 1 image potential state were measured tobe larger for disordered layers. The effective mass was interpreted in the context of charge mobilitymeasurements.