Dresden 2026 – wissenschaftliches Programm

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FM: Fachverband Funktionsmaterialien

FM 10: Crystal Defects and Real Structure Physics in Diamond and Functional Materials II

FM 10.4: Vortrag

Dienstag, 10. März 2026, 15:00–15:15, BEY/0E40

2 - Dimensional hybrid perovskite as a promising semiconductor for large area electronics — •Tomasz Marszalek, Shuanglong Wang, Zhitian Ling, Denis Andrienko, Hai Wang, Paul W.M. Blom, and Wojciech Pisula — Max Planck Institute for Polymer Research, Mainz, Germany

Two-dimensional (2D) perovskites with bulky spacer cations are promising candidates for field-effect transistors due to the suppressed ion movement caused by large size insulating ligands. However, the relationship between the chemical nature of organic cations and film morphology, crystallinity, molecular organisation and charge carrier transport in 2D layered perovskites is not yet fully understood, which significantly limits the development of 2D perovskite FETs.

This report presents a distinct odd-even effect in 2D Sn-based perovskite semiconductors for the first time, incorporating monovalent phenylalkylammonium-based organic cations with alkyl side chains of different lengths containing either an odd or an even number of carbon atoms. An odd-even oscillation of charge carrier transport was revealed using optically pumped terahertz spectroscopy and transistor devices. By combining density functional theory calculations with simulated grazing-incidence wide-angle X-ray scattering, we demonstrate that organic ligands featuring odd carbon atoms exhibit a disordered crystal lattice and tilted inorganic octahedra. This results in a larger effective mass and inferior charge mobilities compared to perovskites with an even number of carbon atoms in the organic cations. (J. Am. Chem. Soc. 2024, 146, 19128, Mater. Horiz., 2024,11, 1177)

Keywords: Ruddlesden-Popper metal halide perovskites; Dion-Jacobson perovskites; Field-effect transitors; Organic cations; Charge carrier mobility