Proceedings of MATSUS Spring 2024 Conference (MATSUS24)
DOI: https://doi.org/10.29363/nanoge.matsus.2024.070
Publication date: 18th December 2023
The family of hybrid organic-inorganic lead-halide perovskites are the subject of intense interest for optoelectronic applications, including solar cells, light-emitting diodes and detectors. Interest in the sub-class of 2D layered hybrid perovskites has been increasing due to their structural and compositional versatility. This versatility allows for the incorporation of spacer cations with an extended conjugated system that are electronically active, as opposed to the electronically inactive alkylammonium- and phenylethylammonium-derived spacer cations that are most often used.[1]
I will present our work on 2D layered perovskites containing optically and electronically active carbazole-based Cz-Ci molecules [2-3], where Ci indicates an alkylammonium chain and i indicates the number of CH2 units in the chain, varying from 3−5. These 2D perovskites, with a formula of (Cz-Ci)2PbI4, show a tunable electronic coupling between the inorganic lead-halide and organic layers. The strongest interlayer electronic coupling was found for (Cz-C3)2PbI4, containing the carbazole spacer with the shortest alkyl chain length. Using ultrafast spectroscopy, we measure ultrafast hole transfer from the photoexcited lead-halide layer to the Cz-Ci molecules, the efficiency of which increases by varying the chain length from i=5 to i=3. The charge transfer results in long-lived carriers (10 – 100 ns) and quenched emission. Electrical charge transport measurements using single-carrier devices show markedly increased out-of-plane carrier mobilities compared to the reference 2D perovskite (PEA)2PbI4, with carrier mobility increasing from i=5 to i=3.[4]
The Research Foundation Flanders (FWO) is acknowledged for the funding of the SBO project PROCEED (S002019N) and the senior FWO research projects G043320N and G0A8723N.
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