Two-photon photoemission of ultrathin film PTCDA morphologies on Ag(111)

Aram Yang, Steven T. Shipman, Sean Garrett-Roe, James Johns, Matt Strader, Paul Szymanski, Eric Muller, Charles Harris

Research output: Contribution to journalArticlepeer-review

35 Scopus citations

Abstract

Morphology- and layer-dependent electronic structure and dynamics at the PTCDA/Ag(111) interface have been studied with angle-resolved two-photon photoemission. In Stranski-Krastanov growth modes, the exposed wetting layer inhibited the evolution of the vacuum level and valence band to bulk values. For layer-by-layer growth, 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 to be larger for disordered layers. The effective mass was interpreted in the context of charge mobility measurements.

Original languageEnglish (US)
Pages (from-to)2506-2513
Number of pages8
JournalJournal of Physical Chemistry C
Volume112
Issue number7
DOIs
StatePublished - Feb 21 2008

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