To fulfill the promise of two-dimensional perovskites (2DPs) for high-performance optoelectronics, we used mechanical exfoliation to obtain n = 1 / n = 3 2DP-heterostructures and ultrafast techniques to characterize charge carriers’ dynamics at interface.
In the presence of the heterostructure, we observe the suppression of excitonic-radiative recombination and the introduction of a fast decay channel for excitons (t < 2 ns) which explains more than 80% of the total photoluminescence decay. Such evidence can be explained through ultrafast electron and hole transfer at the heterostructure interface.
The combination of femtosecond pulses with microscopes resolves processes at ultrashort time scales with spatial resolution. However, an integration into three-dimensional imaging methods, allowing to retrieve ultrashort processes as a function of three-dimensional space and time in complex and crowded environments, is lacking. We have achieved the implementation of broadband optical pulses with more than 100 nm bandwidth into a holographic optical diffraction tomography (ODT) setup. Besides having overcome a critical step towards ultrafast three-dimensional imaging we realized spectrally resolved ODT, retrieving the specimen’s refractive index as a function of 3D space and wavelength over the entire bandwidth.
We perform ultrafast Faraday holographic imaging to track the magnetization dynamics of perovskites in time and space. This interferometric imaging technique, based on off-axis holography, has the advantage of being shot-noise limited and allows us to get access to both amplitude and phase information of the measured signal. As a result, we can directly retrieve and disentangle the angular momentum and the spin components of the total magnetic moment inside the material. Here, we present our results on Methylammonium Lead Tribromide (MAPbBr3), a prototypical hybrid metal halide perovskite with captivating magnetic properties for future opto-spintronic applications.
KEYWORDS: Antennas, Molecular mechanisms, Proteins, Quenching (fluorescence), Energy transfer, Time resolved spectroscopy, Microscopy, In vivo imaging, Femtosecond phenomena, Chromophores
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