A5007312227- TiO2 Photocatalysis and Solar Cells
- Advanced Photocatalysis Techniques
- Perovskite Materials and Applications
- Quantum Dots Synthesis And Properties
- Advanced Nanomaterials in Catalysis
- Chalcogenide Semiconductor Thin Films
- Solid-state spectroscopy and crystallography
- X-ray Diffraction in Crystallography
- Crystallization and Solubility Studies
- Spectroscopy Techniques in Biomedical and Chemical Research
- Conducting polymers and applications
- Thermal Expansion and Ionic Conductivity
- Spectroscopy and Chemometric Analyses
- Gold and Silver Nanoparticles Synthesis and Applications
- Organic and Molecular Conductors Research
- Polyoxometalates: Synthesis and Applications
- Copper-based nanomaterials and applications
- Organometallic Compounds Synthesis and Characterization
- Nanomaterials for catalytic reactions
- Cardiac Valve Diseases and Treatments
- Nanoparticles: synthesis and applications
- Transition Metal Oxide Nanomaterials
- Electrochemical Analysis and Applications
- Hydrogen Storage and Materials
- Tribology and Wear Analysis
National Technical University of Athens
2007-2025
National Centre of Scientific Research "Demokritos"
2014-2023
Institució Catalana de Recerca i Estudis Avançats
2010
Universitat Jaume I
2010
Institut Català d'Investigació Química
2010
National and Kapodistrian University of Athens
1991
Stable s(2) lone pair electrons on heavy main-group elements in their lower oxidation states drive a range of important phenomena, such as the emergence polar ground some ferroic materials. Here we study perovskite halide CsSnBr3 an embodiment broader materials class. We show that stereochemical activity due to Sn(2+) causes crystallographically hidden, locally distorted state appear upon warming, phenomenon previously referred emphanisis. The synchrotron X-ray distribution function acquired...
We report the vibrational and optical properties of 'defect' perovskites Cs2SnX6 (X = Cl, Br, I) as well their use hole-transporting materials (HTMs) in solar cells. All three air-stable compounds were characterized using powder X-ray diffraction Rietveld refinement. Far-IR reflectance, Raman, UV–vis spectroscopy electronic band structure calculations show that are direct gap semiconductors with a pronounced effect halogen atom on size energy frequencies. Scanning electron microscopy atomic...
This study reports Raman and infrared spectra of hybrid organic–inorganic MAPbX3 perovskites (MA = CH3NH3, X Cl, Br, I) their mixed-halide derivatives. were recorded at three laser wavelengths (514, 785, 1064 nm) under on- off-resonance conditions, as well room temperature 100 K. The use different excitation allowed the unambiguous acquisition "true" from perovskites, without degradation or photoinduced structural changes. Low-frequency PbX vibrational modes thoroughly identified by...
Abstract The structure of the hybrid perovskite HC(NH 2 ) PbI 3 (formamidinium lead iodide) reflects competing interactions associated with molecular motion, hydrogen bonding tendencies, thermally activated soft octahedral rotations, and propensity for Pb 2+ lone pair to express its stereochemistry. High‐resolution synchrotron X‐ray powder diffraction reveals a continuous transition from cubic α‐phase (Pm m, #221) tetragonal β‐phase (P4/mbm, #127) at around 285 K, followed by first‐order...
We have demonstrated heterogeneous photocatalytic degradation of microcystin-LR (MC-LR) by visible light activated carbon doped TiO(2) (C-TiO(2)) nanoparticles, synthesized a modified sol-gel route based on the self-assembly technique exploiting oleic acid as pore directing agent and source. The C-TiO(2) nanoparticles crystallize in anatase phase despite low calcination temperature 350 °C exhibit highly porous structure that can be optimized tuning concentration surfactant. nanomaterials...
The CsSnI3 perovskite and the corresponding SnF2-containing material with nominal composition CsSnI2.95F0.05 were synthesized by solid-state reactions structurally characterized powder X-ray diffraction. Both materials undergo rapid phase transformation upon exposure to air from black orthorhombic (B-γ-CsSnI3) yellow (Y-CsSnI3), followed irreversible oxidation into Cs2SnI6 within several hours. transition occurs at a significantly lower rate in rather than pure perovskite. high hole-carrier...
Innovative sol–gel synthesis based on the self-assembling template method has been applied to synthesize mesoporous anion-doped TiO2 with N–F, S and C atoms using suitable surfactants reagents, improve simultaneously structural, morphological, electronic properties of nanomaterials achieve anion doping titania high visible light photoinduced reactivity. The incorporation species in structure resulted effective extension optical absorption range through formation intragap energy states....
Laboratory-size dye solar cells (DSCs), based on industrially feasible materials and processes employing liquid electrolytes, have been developed. Cells two electrolyte solvents with different physical properties were subjected to thermal stress test at 80 °C for 2000 h in the dark monitor their long-term stability. The DSCs incorporating a methoxypropionitrile (MPN)-based presented severe efficiency loss 1 sun AM 1.5G of more than 70% upon aging, while using tetraglyme (TG) as high boiling...