Proceedings of MATSUS Fall 2024 Conference (MATSUSFall24)
DOI: https://doi.org/10.29363/nanoge.matsusfall.2024.244
Publication date: 28th August 2024
Lead halide perovskite (LHP) nanocrystals have recently attracted considerable attention as a promising class of materials for optoelectronic applications. Their ionic lattice and labile surface chemistry require new strategies in ligand development. Recently, a range of ligands have been developed that significantly improve the colloidal stability of LHP NCs. This was mainly achieved by using zwitterionic ligands. To drive further development of ligands for LHP NCs, we sought to rationalize the binding behavior of commonly used ligands. Our study shows that zwitterionic phosphocholine- and phosphoethanolamine-based ligands bind statically to the LHP NC surface and exhibit the highest stability. Sulfobetaine-based ligands offer a good balance between stability and binding dynamics. Several ammonium-based ligands exhibit high dynamics but often have insufficient stability due to their pH sensitivity or suboptimal binding to the A-site pockets.
In this work, we propose a new family of long-chain guanidinium-based ligands that, without compromising stability, provide dynamic binding to the surface of NCs and thus easily accessible active sites on the surface. A library of guanidinium-based ligands was synthesized and applied to LHP NCs of different sizes and compositions, such as CsPbBr3, FAPbBr3 and CsPbI3. The new synthetic approach enables the preparation of LHP NCs with quantum yields of up to 95% in colloidal solutions and up to 80% in compact films. This combination of properties makes LHP NCs capped with guanidinium-based ligands very promising for photocatalytic applications.
This work was created as part of Innosuisse (grant number 32908.1).
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