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The Growth of α-sexithiophene Films on Ag(111) Studied by Means of PEEM With Linearly Polarized Light

The Growth of α-sexithiophene Films on Ag(111) Studied by Means of PEEM With Linearly Polarized Light

Thorsten Wagner, Ebrahim Ghanbari, Daniel Huber, Peter Zeppenfeld

Ultramicroscopy. 2015 Dec;159 Pt 3:464-9.

PMID: 26150140

Abstract:

In this study, we used photo electron emission microscopy (PEEM) to investigate the growth of α-sexithiophene (α-6 T) on Ag(111) surfaces. The experiments were carried out with linearly polarized ultraviolet-light (Hg lamp with hν=4.9 eV) in order to probe the alignment of the molecules on the surface. In particular, we acquired images before, during, and after growth while changing the polarization in a stepwise manner. For the stationary states of the clean and the α-6 T covered surfaces, we monitored the local electron yield and the intensity of the ultraviolet C-light (100-280 nm) reflected from the whole sample using PEEM and a photodiode, respectively. Due to the high ionization potential (IP>5 eV), there is no direct photoelectron emission from the organic crystallites. However, the photoelectron emission of the metal/organic interface is influenced by anisotropic absorption of the incident light beam, since the adsorbed molecules act as dichroic filters with distinct orientations.

Chemicals Related in the Paper:

Catalog Number	Product Name	Structure	CAS Number	Price
AP88493554	α-Sexithiophene		88493-55-4	Price

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