A5103274827- Perovskite Materials and Applications
- Quantum Dots Synthesis And Properties
- Conducting polymers and applications
- Chalcogenide Semiconductor Thin Films
- TiO2 Photocatalysis and Solar Cells
- Ga2O3 and related materials
- Gas Sensing Nanomaterials and Sensors
- Carbon Nanotubes in Composites
- Laser-Ablation Synthesis of Nanoparticles
- Nanowire Synthesis and Applications
- Advanced Photocatalysis Techniques
- Photonic and Optical Devices
- Fullerene Chemistry and Applications
- Silicon Nanostructures and Photoluminescence
- Organic Light-Emitting Diodes Research
- Diamond and Carbon-based Materials Research
- Nonlinear Optical Materials Studies
- Advanced Fluorescence Microscopy Techniques
- Pharmaceutical and Antibiotic Environmental Impacts
- Electronic and Structural Properties of Oxides
- Photochromic and Fluorescence Chemistry
- Semiconductor materials and devices
- Laser-induced spectroscopy and plasma
- Ferroelectric and Piezoelectric Materials
- Curcumin's Biomedical Applications
Institut National de la Recherche Scientifique
2011-2022
École de Technologie Supérieure
2017-2020
Varian Medical Systems (Switzerland)
2020
Université du Québec
2011
Centre National de la Recherche Scientifique
2006-2007
Institut de Physique et Chimie des Matériaux de Strasbourg
2007
In recent years, hybrid organic-inorganic halide perovskites have been widely studied for the low-cost fabrication of a wide range optoelectronic devices, including impressive perovskite-based solar cells. Amongst key factors influencing performance these efforts focused on tailoring granularity and microstructure perovskite films. Albeit, cost-effective technique allowing to carefully control their in ambient environmental conditions has not realized. We report solvent-antisolvent processed...
Abstract Hybrid organic–inorganic perovskites have shown exceptional semiconducting properties and microstructural versatility for inexpensive, solution‐processable photovoltaic optoelectronic devices. In this work, an all‐solution‐based technique in ambient environment highly sensitive high‐speed flexible photodetectors using high crystal quality perovskite nanowires grown on Kapton substrate is presented. At 10 V, the optimized photodetector exhibits a responsivity as 0.62 A W −1 , maximum...
This study examined the consequences of surface carboxylation multiwalled carbon nanotubes (MWCNT) on bioactivity. Since commercial raw MWCNT contain impurities that may affect their bioactivity, HCl refluxing was exploited to purify "as-received" by removing amorphous layer and reducing metal (e.g. Ni). The removal confirmed Raman spectroscopy thermogravimetric analysis. Furthermore, HCl-purified provided more available reaction sites, leading enhanced sidewall functionalization. further...
Pulsed laser ablation for the direct synthesis of single-wall carbon nanotube/PbS-quantumdot(SWCNT/PbS-QD) nanohybrids is demonstrated. The latitude developed pulsed deposition process permits not only control size PbS-QDs but also straightforward integration these novel SWCNT/PbS-QD into photoconductive (PC) devices. Thus, by optimizing nanohybrid characteristics, PC devices exhibiting fast strong photoresponse (as high as 1350% at 405 nm) are achieved.
A nano-engineered hybrid material consisting of SWCNTs, PbS-QDs and a halide perovskite is developed for the first time. The in system are found to be charge generator charge-transfer facilitator. integrated into photoconductive devices shows broad spectral response.
Transparent and pinhole free hole‐blocking layers such as TiO 2 grown at low temperatures by scalable processes are necessary to reduce production costs thus enabling commercialization of perovskite solar cells. Here, the authors compare transport properties compact spray pyrolysis from commonly used titanium diisopropoxide bisacetylacetonate ([Ti(OPr i ) (acac) ]) precursor films TiCl 4 . Spray provides insights into interdependence chemistry electron their influence on performance X‐ray...
Abstract Organic-inorganic perovskites have already shown a tremendous potential for low-cost light-harvesting devices. Yet, the relatively low carrier mobilities in bulk still prevent large-area devices with performances competing state-of-the-art technologies. Here, we tackle this fundamental challenge by incorporating single-wall carbon nanotubes within perovskite matrix means of simple two-step method ambient air. Using nano-engineered hybrid film, demonstrate photodetectors...
Perovskite multiferroic oxides are promising materials for the realization of sensitive and switchable photodiodes because their favorable band gap (<3.0 eV), high absorption coefficient, tunable internal ferroelectric (FE) polarization. A high-speed photodiode based on Bi2FeCrO6 (BFCO)/SrRuO3 (SRO)-layered heterojunction was fabricated by pulsed laser deposition. The exhibits a large ideality factor ( n = ∼5.0) response time as fast 68 ms, thanks to effective charge carrier transport...
Abstract The pulsed laser deposition method was used to decorate appropriately single wall carbon nanotubes (SWCNTs) with PbS quantum dots (QDs), leading the formation of a novel class SWCNTs/PbS-QDs nanohybrids (NHs), without resorting any ligand engineering and/or surface functionalization. number ablation pulses (N Lp ) control average size PbS-QDs and their coverage on SWCNTs’ surface. Photoconductive (PC) devices fabricated from these NHs have shown significantly enhanced photoresponse,...
Fabrication of efficient halide perovskite solar cells under ambient conditions and their stability remain a challenge due to the sensitivity perovskites moisture, oxygen, light, temperature.
The pulsed laser deposition (PLD) technique is used for the direct fabrication of nanohybrid heterojunctions (NH‐HJs) solar cells exhibiting high PCE and excellent stability in air without any encapsulation and/or resorting to surface treatment, ligand engineering post‐synthesis processing. NH‐HJs are achieved through PLD‐based decoration hydrothermally‐grown one‐dimensional TiO 2 nanorods (TiO ‐NRs) by PbS quantum dots (PbS‐QDs). By optimizing both amount PbS‐QDs (via number ablation...
Abstract The morphology of hybrid organic–inorganic perovskite films is known to strongly affect the performance perovskite‐based solar cells. CH 3 NH PbI 3‐x Cl x (MAPbI ) have been previously fabricated with 100% surface coverage in glove boxes. In ambient air, fabrication generally relies on solvent engineering obtain compact films. contrast, this work explores potential altering perovskites microstructure for cell engineering. This starts 3‐ , grain carefully controlled by varying...
Organic hole‐transporting materials (HTM) are widely used for high‐efficiency solar cells. However, compared with their inorganic counterparts, these often expensive and require complex synthesis methods the addition of costly dopants to improve performance. In addition, exposure ambient environment affects chemical stability some organic as well device characteristics. Herein, an all‐ambient fabrication method is develop a CuSCN layer alternative conventional Spiro‐OMeTAD HTM. thin films...
The authors investigated the optical data and image storage in polymeric materials functionalized with azo-dye molecules. Thin films are initially poled to generate a spatially homogeneous second harmonic signal. information is locally inscribed through disorientation of azo chromophores by successive isomerization cycles induced two-photon absorption processes. resulting micron-scale controlled decrease signal can be exploited perform storage. As demonstration proposed method, they store...