Berlin 2018 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 115: Molecular films: Photovoltaics, electronics and morphology (joint session O/CPP)
O 115.3: Vortrag
Freitag, 16. März 2018, 11:00–11:15, MA 144
Work function variation due to electron induced conversion of self-assembled monolayers into carbon nano-membranes — Paul Penner1, •Sascha Koch1, Marcin Kiesiel2, Thilo Glatzel2, Emanuel Marchewski1, Xianghui Zhang1, Ernst Meyer2, and Armin Gölzhäuser1 — 1Faculty of Physics, University of Bielefeld, 33615 Bielefeld, Germany — 2Department of Physics, University of Basel, 4056 Basel, Switzerland
For the realization and improvement of molecular electronic devices as for instance nano capacitors, the determination and specific tuning of electrical properties of the build-in materials plays an important role [1]. Our main research is focused on Carbon nano-membranes (CNMs), made by e.g. electron irradiation induced cross-linking of self-assembled monolayers (SAMs) of aromatic, organic molecules. Using different precursor molecules for the SAM preparation allows us to tune various properties of the resulting CNM [2]. Here, we present a material study about the change in the work function of pristine SAMs and CNMs on a Au(111) substrate by means of Kelvin Probe Force Microscopy (KPFM) for different precursor molecules. For different samples, the morphology as well as the work function of partially cross-linked and pristine SAM areas were compared, showing only differences in the contact potential (CPD). This effect can be attributed to the dipole moment modification of the molecular layer as well as the molecule-substrate interface but also to influences of different headgroup functionalizations. [1] X. Zhang et al., J.Appl.Phys. 2017, 122, 055103. [2] A. Turchanin et al., Adv. Mater. 2016, 28, 6075-6103.