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- W2620584420 abstract "How photoexcitations evolve into Coulomb-bound electron and hole pairs, called excitons, and unbound charge carriers is a key cross-cutting issue in photovoltaics and optoelectronics. Until now, the initial quantum dynamics following photoexcitation remains elusive in the hybrid perovskite system. Here we reveal excitonic Rydberg states with distinct formation pathways by observing the multiple resonant, internal quantum transitions using ultrafast terahertz quasi-particle transport. Nonequilibrium emergent states evolve with a complex co-existence of excitons, carriers and phonons, where a delayed buildup of excitons under on- and off-resonant pumping conditions allows us to distinguish between the loss of electronic coherence and hot state cooling processes. The nearly ∼1 ps dephasing time, efficient electron scattering with discrete terahertz phonons and intermediate binding energy of ∼13.5 meV in perovskites are distinct from conventional photovoltaic semiconductors. In addition to providing implications for coherent energy conversion, these are potentially relevant to the development of light-harvesting and electron-transport devices." @default.
- W2620584420 created "2017-06-09" @default.
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- W2620584420 date "2017-06-01" @default.
- W2620584420 modified "2023-10-13" @default.
- W2620584420 title "Ultrafast terahertz snapshots of excitonic Rydberg states and electronic coherence in an organometal halide perovskite" @default.
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- W2620584420 doi "https://doi.org/10.1038/ncomms15565" @default.
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