Abstract
Lead halide perovskite has emerged as a potential material for a wide range of applications, including solar cells, light-emitting diode displays, lasing, and single photon emitters. To optimize their utilization in optoelectronic devices, the fundamental photophysical properties, especially their charge carrier transition and blinking behaviors, must be elucidated. In this study, we investigate the blinking behaviors of single formamidinium bromide perovskite quantum dots (FAPbBr3 PQDs) on the n-type TiO2 substrate. It is suggested that the electrons from TiO2 fill the trap states of FAPbBr3 PQD during Fermi-level equilibrium, which can reduce the possibility of capturing the hot electrons from PQD into the trap states. In addition, charge separation and charge recombination processes between PQD and TiO2 are expected to shorten the duration of the OFF state, thus stabilizing the fluorescence of PQDs.
Highlights
Colloidal perovskite quantum dots (PQDs) exhibit appealing optical properties of high photoluminescence (PL) quantum yield (QY), broadly tunable emission wavelength that includes the visible spectral range, and a narrow emission line width, which enables their wide applications in optoelectronic devices, such as solar cells, lightemitting diodes, lasing, and single photon sources.1–5 To optimize their utilization in optoelectronic devices, it is necessary to investigate the fundamental photophysical properties, such as the fluorescence intermittency and interfacial charge transfer
We consider that this study provides some significant insights into the charge carrier transport between PQDs and TiO2, which can be a key ingredient in the practical applications of PQD-based optoelectronic devices
We experimentally observed a highly suppressed blinking from FAPbBr3 PQDs placed on a TiO2 n-type semiconductor substrate
Summary
Colloidal perovskite quantum dots (PQDs) exhibit appealing optical properties of high photoluminescence (PL) quantum yield (QY), broadly tunable emission wavelength that includes the visible spectral range, and a narrow emission line width, which enables their wide applications in optoelectronic devices, such as solar cells, lightemitting diodes, lasing, and single photon sources. To optimize their utilization in optoelectronic devices, it is necessary to investigate the fundamental photophysical properties, such as the fluorescence intermittency (or blinking) and interfacial charge transfer. Colloidal perovskite quantum dots (PQDs) exhibit appealing optical properties of high photoluminescence (PL) quantum yield (QY), broadly tunable emission wavelength that includes the visible spectral range, and a narrow emission line width, which enables their wide applications in optoelectronic devices, such as solar cells, lightemitting diodes, lasing, and single photon sources.. The extra non-radiative (NR) electron transfer (El_T) pathways between PQDs and TiO2, including charge separation and charge recombination, could eliminate the charged states (OFF state) of the PQDs.27 Such extra NR El_T pathways could influence the photon emission statistics of the single FAPbBr3 PQDs. We consider that this study provides some significant insights into the charge carrier transport between PQDs and TiO2, which can be a key ingredient in the practical applications of PQD-based optoelectronic devices
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