SKM 2023 – wissenschaftliches Programm
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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 26: Electrical, Dielectrical and Optical Properties of Thin Films
CPP 26.3: Vortrag
Dienstag, 28. März 2023, 14:30–14:45, MER 02
Programmed Assembly of Dipolar Precursors into Porous, Crystalline Molecular Thin Films — •Alexei Nefedov1, Ritesh Haldar1, Zhiyun Xu1, Hannes Kühner1, Dennis Hofmann2, David Goll2, Benedikt Sapotta1, Stefan Hecht3, Marjan Krstić1, Carsten Rockstuhl1, Wolfgang Wenzel1, Stefan Bräse1, Petra Tegerer2, Egbert Zojer4, and Christof Wöll1 — 1Karlsruhe Institute of Technology, Eggenstein-Leopoldshafen, Germany — 2Universität Heidelberg, Heidelberg, Germany — 3RWTH Aachen University, Aachen, Germany — 4Graz University of Technology, Graz, Austria
Liquid-phase, quasi-epitaxial growth has been used to stack asymmetric, dipolar organic compounds on inorganic substrates, permitting porous, crystalline molecular materials which lack inversion symmetry. This allows material fabrication with built-in electric fields. We describe a new programmed assembly strategy based on metal-organic frameworks (MOFs) that facilitates crystalline, non-centrosymmetric space groups for achiral compounds. Electric fields are integrated into crystalline, porous thin films with an orientation normal to the substrate. Changes in electrostatic potential are detected via core-level shifts of marker atoms on the MOF thin films and agree with theoretical results. The integration of built-in electric fields into molecular solids creates possibilities for band structure engineering to control the alignment of electronic levels in organic molecules and it may also be used to tune the transfer of charges from donors loaded via programmed assembly into MOF pores.