Revealing charge-carrier complexes and interactions in single lead-halide perovskites nanocrystals

Brahim Lounis

doi:10.1117/12.2680613

1 October 2023 Revealing charge-carrier complexes and interactions in single lead-halide perovskites nanocrystals

Brahim Lounis

Proceedings Volume PC12659, Organic and Hybrid Light Emitting Materials and Devices XXVII; PC126590H (2023) https://doi.org/10.1117/12.2680613
Event: SPIE Organic Photonics + Electronics, 2023, San Diego, California, United States

Abstract

Lead halide perovskites open great prospects for optoelectronics and a wealth of potential applications in quantum optical and spin-based technologies. Precise knowledge of the fundamental optical and spin properties of charge-carrier complexes at the origin of their luminescence is crucial in view of the development of these applications. On nearly bulk Cesium-Lead-Bromide single perovskite nanocrystals, which are the test bench materials for next-generation devices as well as theoretical modeling, we perform low-temperature magneto-optical spectroscopy to reveal their entire band-edge exciton fine structure and charge-complex binding energies. We demonstrate that the ground exciton state is dark and lays several millielectronvolts below the lowest bright exciton sublevels, which settles the debate on the bright-dark exciton level ordering in these materials. More importantly, combining these results with spectroscopic measurements on various perovskite nanocrystal compounds, we show evidence for universal scaling laws relating the exciton fine structure splitting, the trion and biexciton binding energies to the band-edge exciton energy in lead-halide perovskite nanostructures, regardless of their chemical composition. These scaling laws solely based on quantum confinement effects and dimensionless energies offer a general predictive picture for the interaction energies within charge-carrier complexes photo-generated in these emerging semiconductor nanostructures.

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Brahim Lounis "Revealing charge-carrier complexes and interactions in single lead-halide perovskites nanocrystals", Proc. SPIE PC12659, Organic and Hybrid Light Emitting Materials and Devices XXVII, PC126590H (1 October 2023); https://doi.org/10.1117/12.2680613

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KEYWORDS

Perovskite

Excitons

Nanocrystals

Nanostructures

Quantum spin

Quantum technologies

Quantum technology applications

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