Shape-Engineered CsPbBr₃ Nanorods as Tunable Quantum Emitters

Maryna Bodnarchuk^a^,^b, Ihor Cherniukh^a^,^b, Kseniia Shcherbak^a^,^b, Andriy Stelmakh^a^,^b, Chenglian Zhu^a^,^b, Brahim Lounis^c, Gabriele Rainò^a^,^b, Maksym Kovalenko^a^,^b

^aEmpa-Swiss Federal Laboratories for Materials Science and Technology, 8600 Dübendorf, Switzerland

^bInstitute of Inorganic Chemistry, Department of Chemistry and Applied Biosciences, ETH Zurich, 8093 Zurich, Switzerland.

^cUniversité de Bordeaux, LP2N, Talence, France

Proceedings of MATSUS Spring 2026 Conference (MATSUSSpring26)

H2 Halide perovskites for quantum technologies

Barcelona, Spain, 2026 March 23rd - 27th

Organizers: Quinten Akkerman, Simon Boehme and Maksym Kovalenko

Invited Speaker, Maryna Bodnarchuk, presentation 518
Publication date: 15th December 2025

Colloidal caesium lead-halide (CsPbX₃, X = Cl, Br, I) perovskite quantum dots (QDs) increasingly gain attention as quantum light sources, owing to their fast and pure single-photon emission. The rapid radiative decay is a crucial characteristic for quantum emitters, not only because it translates into their brightness, but also for boosting single-photon indistinguishability. However, the future practical application of perovskite quantum emitters is restricted by the non-degeneracy of the bright-triplet excitons, manifesting itself in two to three, closely spaced sharp emission lines of comparable intensity and orthogonal polarization.

QD shape engineering offers an additional and powerful tool for further fine-tuning and improvement of optical properties, allowing the manipulation of features that are inaccessible by keeping the shape isotropic. In the case of perovskite QDs, shape anisotropy can enable, for example, directional emission, spatial confinement of excitons in one or two dimensions, tuning of exciton fine structure, and radiative decay. To systematically explore shape-dependent properties of one-dimensional CsPbBr₃ perovskite structures, we developed a synthetic approach toward stable, size- and shape-uniform nanorods (NRs) with tunable thickness (5-24 nm) and aspect ratio (1-16, larger for thinner nanorods). The obtained NRs are of parallelopiped shape (elongated cuboids) and expose four (110) and two (002) facets of the orthorhombic CsPbBr₃(Pbnm space group). By exploiting the difference between {110} and {002} facets, we achieved precise control over NR morphology. The synthesis was guided and rationalized by molecular dynamics simulation of the ligand-binding to pseudo-cubic (100)-facets of the orthorhombic CsPbBr₃. The steric effect of the ligand tail and carboxylate binding group were shown to yield a small but finite difference in the ligand-binding energy for two out of four facets, driving the elongation during the growth. With the use of phosphoethanolamine-based zwitterion ligands providing sufficient stability, we performed comprehensive optical characterization, paving the way for advanced optical functionalities in perovskite nanostructures.

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