Regensburg 2022 – scientific programme

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O: Fachverband Oberflächenphysik

O 81: 2D Materials 4: Heterostructures

O 81.1: Talk

Friday, September 9, 2022, 10:30–10:45, S052

Sub-angstrom non-invasive imaging of microstructures in 2D hybrid perovskites — •Shayan Edalatmanesh^1,3, Mykola Telychko², Kai Leng², Ibrahim Abdelwahab^2,4, Na Guo⁵, Chun Zhang⁵, Jesus Mendieta-Moreno¹, Matyáš Nachtigall¹, Jing Li⁴, Kian Ping Loh², Pavel Jelínek^1,3, and Jiong Lu^2,4 — ¹Institute of Physics, The Czech Academy of Sciences, Prague, Czech Republic — ²Department of Chemistry, NUS, Singapore — ³RCPTM, Palacky University, Olomouc, Czech Republic — ⁴CA2DM, NUS, Singapore — ⁵Department of Physics, NUS, Singapore

Organic-inorganic hybrid two dimensional (2D) Ruddlesden-Popper perovskites (RPPs), made of soft insulating organic layers sandwiched between conducting inorganic frameworks, have recently gained a great deal of attention as candidates for the next generation of optoelectronic devices. To gain an understanding of the cooperative lattice relaxation governing the optoelectronic properties of 2D RPPs, we present sub-angstrom resolution imaging of both soft organic layers and inorganic framework in a prototypical 2D lead-halide RPP crystal using a tip-functionalized Scanning Tunneling Microscopy (STM), non-contact Atomic Force Microscope (ncAFM) and Kelvin Probe Force Microscopy (KPFM) corroborated by theoretical simulations, namely Density Functional Theory (DFT)[1]. We unveil the overall twin-domain composition of the RPP crystal, with alternating quasi-one-dimensional electron and hole-channels at neighboring twin-boundaries, possibly responsible for the long-distance exciton transport in RPPs. Reference: [1] https://arxiv.org/abs/2109.05878