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Multi-Photon Excitation of CsPbBr Perovskite Quantum Dots: How Many Electrons Can One PQD Donate to Multiple Molecular Acceptors?

08:00 EDT 9th May 2019 | BioPortfolio

Summary of "Multi-Photon Excitation of CsPbBr Perovskite Quantum Dots: How Many Electrons Can One PQD Donate to Multiple Molecular Acceptors?"

Metastable multi-excitonic states (MES) of semiconductor quantum dots can be involved in multi-electron transfer reaction, which opens new perspectives in nanomaterials-based opto-electronic applications. Herein, we demonstrate the generation of MES in CsPbBr3 perovskite quantum dots (PQD) and its dissociation dynamics through multiple electrons transfer to molecular electron acceptors, anthraquinones (AQs), bound to the PQD surface by carboxylic anchor. As many as 14 excitons are produced at excitation density of roughly 220 µJ cm-2 without detectable PQD degradation. Addition of AQ results in formation of PQD-AQ hybrids with excess of AQs (
PQD:
AQ ≈ 1:20), which opens the possibility of multi-electron transfer acts from MES to AQs. We found that the electron transfer saturates after roughly five transfer acts and the first ET time constant is as short as 1 ps. However, each ET increases Coulomb potential barrier for the next ET, which decreases the rate of ET resulting a saturation after five ETs.

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Name: The journal of physical chemistry letters
ISSN: 1948-7185
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