Bright excitons and exciton complexes in CsPbBr3 quantum dots

Gabriele Raino; Chenglian Chu; Tan Nguyen; Simon Böhme; Dmitry Dirin; Maryna Bodnarchuk; Claudine Katan; Jacky Even; Maksym V. Kovalenko

doi:10.1117/12.2680866

1 October 2023 Bright excitons and exciton complexes in CsPbBr₃ quantum dots

Gabriele Raino, Chenglian Chu, Tan Nguyen, Simon Böhme, Dmitry Dirin, Maryna Bodnarchuk, Claudine Katan, Jacky Even, Maksym V. Kovalenko

Author Affiliations +

Proceedings Volume PC12659, Organic and Hybrid Light Emitting Materials and Devices XXVII; PC126590J (2023) https://doi.org/10.1117/12.2680866
Event: SPIE Organic Photonics + Electronics, 2023, San Diego, California, United States

Abstract

All-inorganic lead-halide perovskite (CsPbX3, X = Cl, Br, I) quantum dots (QDs) have emerged as a competitive platform for various optoelectronic applications e.g., LEDs featuring narrow emission and quantum light sources. Many-body interactions and quantum correlations among photogenerated exciton complexes play an essential role, e.g., by determining the laser threshold, the overall brightness of LEDs, and the single-photon purity in quantum light sources. In this work, by combining single-QD optical spectroscopy performed at cryogenic temperatures in combination with configuration interaction (CI) calculations, we address the trion and biexciton binding energies and unveil their peculiar size dependence. We find that trion binding energies increase from 7 meV to 17 meV for QD sizes decreasing from 30 nm to 9 nm, while the biexciton binding energies increase from 15 meV to 30 meV, respectively. CI calculations quantitatively corroborate the experimental results and suggest that the effective dielectric constant for biexcitons slightly deviates from the one of the single excitons, potentially as a result of coupling to the lattice in the multiexciton regime. Our findings provide a deep insight into the multiexciton properties in all-inorganic lead-halide perovskite QDs, essential for classical and quantum optoelectronic devices.

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Gabriele Raino, Chenglian Chu, Tan Nguyen, Simon Böhme, Dmitry Dirin, Maryna Bodnarchuk, Claudine Katan, Jacky Even, and Maksym V. Kovalenko "Bright excitons and exciton complexes in CsPbBr₃ quantum dots", Proc. SPIE PC12659, Organic and Hybrid Light Emitting Materials and Devices XXVII, PC126590J (1 October 2023); https://doi.org/10.1117/12.2680866

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KEYWORDS

Excitons

Quantum dots

Biexcitons

Light emitting diodes

Perovskite

Quantum light sources

Quantum dot emission

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