ORCID Profile
0000-0002-4019-6138
Current Organisation
CNRS Délégation Midi-Pyrénées
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Publisher: American Chemical Society (ACS)
Date: 29-01-2019
Publisher: Springer Science and Business Media LLC
Date: 15-06-2015
DOI: 10.1038/NPHYS3357
Publisher: American Chemical Society (ACS)
Date: 04-09-2019
Publisher: Wiley
Date: 19-10-2016
Abstract: The extent to which the soft structural properties of metal halide perovskites affect their optoelectronic properties is unclear. X-ray diffraction and micro-photoluminescence measurements are used to show that there is a coexistence of both tetragonal and orthorhombic phases through the low-temperature phase transition, and that cycling through this transition can lead to structural changes and enhanced optoelectronic properties.
Publisher: Royal Society of Chemistry (RSC)
Date: 2016
DOI: 10.1039/C5EE03435C
Abstract: The reduced effective mass ( μ ) and excitonic Rydberg ( R *) are measured by magneto-optics for new perovskite semiconductors.
Publisher: Wiley
Date: 23-07-2023
Abstract: 2D Ruddlesden‐Popper metal‐halide perovskites feature particularly strong excitonic effects, making them a fascinating playground for studying exciton physics. A complete understanding of the properties of this quasi‐particle is crucial to fully exploit the tremendous potential of 2D perovskites (2DP) in light emission applications. Despite intense investigations, some of the exciton properties remain elusive to date, for ex le, the energy‐ordering of the exciton states within the so‐called fine structure manifold. Using optical spectroscopy, it demonstrates that in the archetypical 2DP (PEA) 2 PbI 4 , in contradiction to theoretical predictions, the energy of the bright out‐of‐plane exciton state is higher than that of two in‐plane states. Having elucidated the order of exciton fine structure, it determines the g ‐factor of the dark exciton transition, together with the values of the electron and hole g ‐factors in the direction parallel to the c ‐axis of the crystal. In this way, it provides for the first time, a complete picture of the exciton fine structure in (PEA) 2 PbI 4 2DP.
Publisher: Springer Science and Business Media LLC
Date: 28-04-2023
DOI: 10.1038/S41467-023-38008-4
Abstract: Detecting low dose rates of X-rays is critical for making safer radiology instruments, but is limited by the absorber materials available. Here, we develop bismuth oxyiodide (BiOI) single crystals into effective X-ray detectors. BiOI features complex lattice dynamics, owing to the ionic character of the lattice and weak van der Waals interactions between layers. Through use of ultrafast spectroscopy, first-principles computations and detailed optical and structural characterisation, we show that photoexcited charge-carriers in BiOI couple to intralayer breathing phonon modes, forming large polarons, thus enabling longer drift lengths for the photoexcited carriers than would be expected if self-trapping occurred. This, combined with the low and stable dark currents and high linear X-ray attenuation coefficients, leads to strong detector performance. High sensitivities reaching 1.1 × 10 3 μC Gy air −1 cm −2 are achieved, and the lowest dose rate directly measured by the detectors was 22 nGy air s −1 . The photophysical principles discussed herein offer new design avenues for novel materials with heavy elements and low-dimensional electronic structures for (opto)electronic applications.
Publisher: Royal Society of Chemistry (RSC)
Date: 2017
DOI: 10.1039/C7EE00685C
Abstract: The authors directly show that grain size and quality have a negligible impact on the excitonic characteristics of perovskite semiconductors.
Publisher: American Chemical Society (ACS)
Date: 17-07-2018
Publisher: American Chemical Society (ACS)
Date: 13-05-2022
No related grants have been discovered for Paulina Plochocka.