Dresden 2020 – wissenschaftliches Programm

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DS: Fachverband Dünne Schichten

DS 11: 2D semiconductors and van der Waals heterostructures II (joint session HL/DS)

DS 11.3: Vortrag

Montag, 16. März 2020, 15:45–16:00, POT 81

Enabling tailored 2D materials by introducing 1D organic-inorganic perovskites with supramolecular intra-layer interactions — •Philip Klement¹, Natalie Dehnhardt², Chuan-Ding Dong³, Samuel Bayliff⁴, Julius Winkler², Peter J. Klar¹, Stefan Schumacher^3,5, Sangam Chatterjee¹, and Johanna Heine² — ¹Institute of Experimental Physics I and Center for Materials Research (ZfM), Justus Liebig University Giessen, Germany — ²Department of Chemistry and Material Sciences Center, Philipps-Universität Marburg, Germany — ³Department of Physics and Center for Optoelectronics and Photonics Paderborn (CeOPP), Paderborn University, Germany — ⁴Department of Chemistry and Biochemistry, University of Oklahoma, Norman, USA — ⁵College of Optical Sciences, The University of Arizona, Tucson, USA

One of the major current challenges in 2D materials* synthesis is the intentional design of building blocks to introducing superior chemical and physical properties. The limiting factor in this approach is the commonly-believed paradigm that in-plane covalent interactions are strictly necessary to form 2D materials, limiting the number of candidates. Here we show that individual single layers of 2D organic-inorganic perovskites with only 1D covalent intralayer-interactions exist. [BzA]3[BiCl5]Cl (BzA = benzylammonium) is exfoliated down to single layers and reveals extremely strong dimensional effects evidenced by a 0.4 eV shift of the photoluminescence between bulk and single layers. We demonstrate that already 1D covalent interactions render 2D materials possible.