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Dresden 2020 – wissenschaftliches Programm

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HL: Fachverband Halbleiterphysik

HL 20: 2D semiconductors and van der Waals heterostructures II (joint session HL/DS)

HL 20.3: 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 Schumacher3,5, Sangam Chatterjee1, and Johanna Heine21Institute 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.

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