![]() Geiregat, P., Justo, Y., Abe, S., Flamee, S. Achieving exciton delocalization in quantum dot aggregates using organic linker molecules. Role of quantum coherence and energetic disorder in exciton transport in polymer films. Coherent and incoherent charge transport in linear triple quantum dots. Interparticle spacing and structural ordering in superlattice PbS nanocrystal solids undergoing ligand exchange. Carrier transport in PbS and PbSe QD films measured by photoluminescence quenching. Ultrafast tracking of exciton and charge carrier transport in optoelectronic materials on the nanometer scale. Photogenerated exciton dissociation in highly coupled lead salt nanocrystal assemblies. Spatial and temporal imaging of long-range charge transport in perovskite thin films by ultrafast microscopy. Long-range ballistic propagation of carriers in methylammonium lead iodide perovskite thin films. Imaging material functionality through three-dimensional nanoscale tracking of energy flow. Spatially resolved photogenerated exciton and charge transport in emerging semiconductors. Direct imaging of long-range exciton transport in quantum dot superlattices by ultrafast microscopy. Two birds with one stone: tailoring singlet fission for both triplet yield and exciton diffusion length. Subdiffusive exciton transport in quantum dot solids. Visualization of exciton transport in ordered and disordered molecular solids. Bandlike transport in strongly coupled and doped quantum dot solids: a route to high-performance thin-film electronics. Coherent exciton delocalization in strongly coupled quantum dot arrays. Charge transport in strongly coupled quantum dot solids. Building devices from colloidal quantum dots. Quantum dot solids showing state-resolved band-like transport. Improved performance and stability in quantum dot solar cells through band alignment engineering. Hybrid organic–inorganic inks flatten the energy landscape in colloidal quantum dot solids. Bright infrared quantum-dot light-emitting diodes through inter-dot spacing control. Band-like transport, high electron mobility and high photoconductivity in all-inorganic nanocrystal arrays. These findings suggest routes to control the optoelectronic properties of QD solids. The fast transport regime occurs only in materials with exciton Bohr radii much larger than the QD sizes, suggesting the transport of delocalized excitons in this regime and a transition to slower transport governed by exciton localization. QD solids with larger interdot distances exhibit higher initial diffusivity and a delayed transition to the slower regime, while higher QD packing density and heterogeneity accelerate this transition. We observe high exciton diffusivity (~10 2 cm 2 s –1) in lead chalcogenide QDs within the first few hundred femtoseconds after photoexcitation followed by a transition to a slower regime (~10 –1–1 cm 2 s –1). Here, using transient absorption microscopy, we reveal the initial exciton dynamics in QDs with femtosecond timescales. Thus, understanding exciton dynamics is essential towards developing and optimizing QD devices. Quantum dot (QD) solids are an emerging platform for developing a range of optoelectronic devices.
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