Trion Formation Hampers Single Quantum Dot Performance in Silane-Coated FAPbBr3 Quantum Dots

Jessica Kline; Shaoni Kar; Benjamin F. Hammel; Yunping Huang; Zixu Huang; Seth R. Marder; Sadegh Yazdi; Gordana Dukovic; Bernard Wenger; Henry Snaith; David S. Ginger

arXiv · 2512.09214

Trion Formation Hampers Single Quantum Dot Performance in Silane-Coated FAPbBr3 Quantum Dots

Jessica Kline·Shaoni Kar·Benjamin F. Hammel·Yunping Huang·Zixu Huang·Seth R. Marder·Sadegh Yazdi·Gordana Dukovic·Bernard Wenger·Henry Snaith·David S. Ginger

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Abstract

We explore silane-coated formamidinium lead bromide (FAPbBr3) quantum dots as single photon emitters and compare them to FAPbBr3 quantum dots passivated with a phosphoethylammonium derivative (PEAC8C12), which represents current state-of-the-art in zwitterionic molecular surface ligand passivation. We compare properties including single-photon purity (g2(t)), linewidth, blinking, and photostability. We find that at room temperature, these silane-coated dots perform comparably to the PEAC8C12 passivation in terms of single-photon performance metrics, while exhibiting improvements in photostability. However, we find that at 4K, silane-coated FAPbBr3 quantum dots perform worse than the PEAC8C12-passivated samples, exhibiting faster blue-shifting and photobleaching under illumination. Analysis of fluorescence lifetime intensity distributions from the photon-counting data indicates increased efficiency of fast non-radiative processes in the silane-coated quantum dots at 4K. We propose a trion related degradation pathway at low temperatures that is consistent with the observed kinetics and estimate that at 4K with 6.1 uJ/cm2, 472 nm excitation the silane-coated quantum dots build up double the trion population of their PEAC8C12-passivated counterparts.

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Jessica Kline, Shaoni Kar, Benjamin F. Hammel, Yunping Huang, Zixu Huang, Seth R. Marder, Sadegh Yazdi, Gordana Dukovic, Bernard Wenger, Henry Snaith, David S. Ginger. 2025-12-10. Trion Formation Hampers Single Quantum Dot Performance in Silane-Coated FAPbBr3 Quantum Dots. https://arxiv.org/abs/2512.09214

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