Special Issue “Photoinduced Ultrafast Dynamics in Nanocomposite Materials” of Nanomaterials

07 December 2022 by Publications

The new Special Issue entitled "Photoinduced Ultrafast Dynamics in Nanocomposite Materials" published by the journal Nanomaterials (ISSN 2079-4991, IF 5.719) is currently open for manuscript submissions with a deadline set at the 30th June 2023. This Special Issue is promoted by the research staff of the EuroFEL Support Laboratory (EFSL) of Istituto di Struttura della Materia of National Research Council of Italy who will act as Guest Editors.

The Special Issue is intended to collect articles on the ultrafast photophysical and dynamical properties of different types of nanocomposite and nanostructured materials and their applications, including: semiconductors with various morphologies such as nanowires, 2D materials, carbon-based materials, multilayer systems, thin films, photonic crystals, metallic and non-metallic plasmonic materials, highly doped semiconductors, transparent conductive oxides, hybrid perovskite materials, organic polymeric materials, organic blends, topological insulators and self-assembled systems. Studies of the photoinduced ultrafast dynamics in hybrid systems which combine two or more of the above materials are particularly welcome, without excluding nanostructured materials in general.

The aim of this Special Issue is to provide a showcase for articles that show the interplay between photoinduced ultrafast dynamics and relevant operating parameters of nanocomposite materials, indicating a route to optimize their photophysical properties and therefore the efficiency of the devices containing them.

The EFSL staff invite all of you to submit your manuscripts and contribute to the success of this Special Issue!

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Photoluminescence and efficiency in perovskite solar cells

10 October 2022 by Publications

The paper "Re‐evaluation of Photoluminescence Intensity as an Indicator of Efficiency in Perovskite Solar Cells" has been published in the Solar RRL journal. It is the outcome of a collaboration between EFSL, CNR-IMM (Istituto per la Microelettronica e i Microsistemi) and CHOSE (Centre for Hybrid and Organic Solar Energy – Regione Lazio) researchers: Valerio Campanari, Faustino Martelli, Antonio Agresti, Sara Pescetelli, Narges Yaghoobi Nia, Francesco Di Giacomo, Daniele Catone, Patrick O'Keeffe, Stefano Turchini, Bowen Yang, Jiajia Suo, Anders Hagfeldt and Aldo Di Carlo.

The photoluminescence (PL) intensity is often used as an indicator of the performance of perovskite solar cells (PSCs) and indeed steady-state PL is therefore used for the characterization of these devices and their constituent materials. However, some features of perovskite materials and devices, if not taken adequately into account, could lead to misleading results. In this work we show that the value of the photoluminescence quenching occurring when the PSCs are switched from open- to short-circuit is an excellent figure of merit (FOM) for the evaluation of the PSC efficiency. In order to take into account the large inhomogeneity of the performance in the PSC yield and their temporal instability, we have used a systematic approach to comparison the PSC conversion efficiency and their PL intensity using a large group of PSCs with efficiency varying from 5.63% to 21.5%. The PSCs were fabricated using different materials both as regards the absorbing materials and the transport layers, different structures, and relatively different fabrication processes. We found that the use of the bare PL intensity in open-circuit (OC) is not a general and reliable indicator of the performances when a large heterogeneous ensemble of devices is used, Instead, considering the values of the PL intensity both at open OC and short circuit (SC) , it is possible to correlate the PL intensity to the device power conversion efficiency (PCE) through a figure of merit based on the quenching of the PL observed in SC and OC conditions (PLQoc-sc=(PLoc-PLsc)/PLoc). We explain the observed correlation between PLQoc-sc and the PCE of the device by means of a simplified model based on the carrier density rate equation, in which the extraction time of the photoexcited carriers in the PSC is duly considered. We have also shown that the analysis of PLQoc-sc using our model can provide a tool to estimate the carrier extraction time in PSCs through a simple cw-PL measurement, provided the carrier lifetime in OC conditions is known. Without suggesting that a PL measurement can substitute a J-V characterization, we point out that our study is an important contribution to the understanding the physical mechanisms underlying carrier recombination and extraction. Moreover, we have found a clear correlation between the increase over time of the PL intensity in SC conditions and the contemporary decrease of the short-circuit current, Isc, a feature that can be easily understood within the framework of our model and FOM.

https://doi.org/10.1002/solr.202200049

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Acoustic Vibration Modes of Gold–Silver Core–Shell Nanoparticles

The EFSL research group, in collaboration with the Laboratoire Lumière, Matière et Interfaces and the Laboratoire de Physique des Solides of Université Paris-Saclay (France) and with the Institut des Molécules et Matériaux du Mans of Le Mans Université, has published a paper in the Chemosensors journal. The title of the article is "Acoustic Vibration Modes of Gold–Silver Core–Shell Nanoparticles" by Tadele Orbula Otomalo, Lorenzo Di Mario, Cyrille Hamon, Doru Constantin, Francesco Toschi, Khanh-Van Do, Vincent Juvè, Pascal Ruello, Patrick O'Keeffe, Daniele Catone, Alessandra Paladini and Bruno Palpant.

https://doi.org/10.3390/chemosensors10050193

 

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Ultrafast Transient Light Extinction by Bimetallic Nanoparticles

The EFSL research group, in collaboration with the Light, Matter and Interfaces Laboratory of Université Paris-Saclay (France), has published a paper in the Advanced Optical Materials journal. The title of the article is "Sharp Spectral Variations of the Ultrafast Transient Light Extinction by Bimetallic Nanoparticles in the Near-UV" by Tadele Orbula Otomalo, Lorenzo Di Mario, Cyrille Hamon, Doru Constantin, Khanh-Van Do, Patrick O'Keeffe, Daniele Catone, Alessandra Paladini and Bruno Palpant.

https://doi.org/10.1002/adom.202001778

 

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Ultrafast optical spectroscopy of semiconducting and plasmonic nanostructures and their hybrids

28 September 2020 by Publications

The EFSL research group has published a paper in the IOP Nanotechnology journal. The title of the article is “Ultrafast optical spectroscopy of semiconducting and plasmonic nanostructures and their hybrids”, by Daniele Catone, Lorenzo Di Mario, Faustino Martelli, Patrick O'Keeffe, Alessandra Paladini, Jacopo Stefano Pelli Cresi, Aswathi Kanjampuarth Sivan, Lin Tian, Francesco Toschi and Stefano Turchini.

https://doi.org/10.1088/1361-6528/abb907

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Plasmon-induced resonant effects on the optical properties of Ag-decorated ZnSe nanowires

The EFSL research group, in collaboration with CNR-IMM and CNR-IOM, has published a paper in Nanotechnology journal entitled “Plasmon-induced resonant effects on the optical properties of Ag-decorated ZnSe nanowires”, by Aswathi K. Sivan, Lorenzo Di Mario, Daniele Catone, Patrick O'Keeffe, Stefano Turchini, Silvia Rubini and Faustino Martelli.

https://doi.org/10.1088/1361-6528/ab68ba

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Stoichiometric Bi2Se3 topological insulator ultra-thin films obtained through a new fabrication process for optoelectronic applications

03 July 2020 by Publications

The EFSL research group, in collaboration with University of Rome Tor Vergata, INFN, Bruno Kessler Foundation and Chalmers University of Technology, has published a paper in Nanoscale journal entitled “Stoichiometric Bi2Se3 topological insulator ultrathin films obtained through a new fabrication process for optoelectronic applications”, by Matteo Salvato, Mattia Scagliotti, Maurizio De Crescenzi, Paola Castrucci, Fabio De Matteis, Michele Crivellari, Stefano Pelli Cresi, Daniele Catone, Thilo Bauch and Floriana Lombardi.

https://doi.org/10.1039/D0NR02725A

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Thermometric Calibration of the Ultrafast Relaxation Dynamics in Plasmonic Au Nanoparticles

The EFSL research group, in collaboration CNR-SPIN, CNR-IFN and University of Genoa, has published a paper in the ACS Photonics on the “Thermometric Calibration of the Ultrafast Relaxation Dynamics in Plasmonic Au Nanoparticles”, by Marzia Ferrera, Giuseppe Della Valle, Maria Sygletou, Michele Magnozzi, Daniele Catone, Patrick O’Keeffe, Alessandra Paladini, Francesco Toschi, Lorenzo Mattera, Maurizio Canepa, and Francesco Bisio

https://pubs.acs.org/doi/10.1021/acsphotonics.9b01605

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Efficient ultrafast melting of gold nanoparticles by interband excitation

27 January 2020 by Publications

The EFSL research group, in collaboration with CNR-SPIN and University of Genoa has published a study in the Journal of Physical Chemistry C on the efficiency of ultrafast melting of gold nanoparticles upon either interband (5d →6sp) or plasmonic excitation. Interestingly the interband excitation turns out to be more efficient than plasmonic excitation for melting of the particles suggesting not all the energy absorbed by the plasmonic absorption is turned into heat. These results will have consequences both of thermoplasmonics and photocatalysis.

"Interband Transitions Are More Efficient Than Plasmonic Excitation in the Ultrafast Melting of Electromagnetically Coupled Au Nanoparticles", by Michele Magnozzi, Remo Proietti Zaccaria, Daniele Catone, Patrick O’Keeffe, Alessandra Paladini, Francesco Toschi, Alessandro Alabastri, Maurizio Canepa and Francesco Bisio.

https://doi.org/10.1021/acs.jpcc.9b03668

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Hot-carriers in perovskite solar cells

23 January 2020 by Publications

The EFSL research group, in collaboration with CHOSE - Centre for Hybrid and Organic Solar Energy, IIT - Istituto Italiano di Tecnologia - Graphene Labs, LASE - Laboratory for Advanced Solar Energy, has published a study in Nano Letters on perovskite solar cells and the role of the graphene embedded in the TiO2 layer on the hot-carrier production in these devices and their stability over time.


Graphene-Induced Improvements of Perovskite Solar Cell Stability: Effects on Hot-Carriers
P. O’Keeffe, D. Catone, A. Paladini, F. Toschi, S. Turchini, L. Avaldi, F. Martelli, A. Agresti, S. Pescetelli, A. E. Del Rio Castillo, F. Bonaccorso, A. Di Carlo
Nano Letters 2019, 19, 684-691

https://pubs.acs.org/doi/10.1021/acs.nanolett.8b03685

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