Prev. Article Next Article Table of Contents

Article

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, and Charles Harris*

Department of Chemistry, University of California, Berkeley, California 94720 and Chemical Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720

J. Phys. Chem. C, 2008, 112 (7), pp 2506–2513

DOI: 10.1021/jp076632q

Publication Date (Web): January 25, 2008

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.

View: Full Text HTML | Hi-Res PDF | PDF w/ Links