A5060432939- Conducting polymers and applications
- Organic Electronics and Photovoltaics
- Advancements in Photolithography Techniques
- Organic Light-Emitting Diodes Research
- Nanofabrication and Lithography Techniques
- Polyoxometalates: Synthesis and Applications
- Semiconductor materials and devices
- Perovskite Materials and Applications
- Electron and X-Ray Spectroscopy Techniques
- Thin-Film Transistor Technologies
- Copper Interconnects and Reliability
- Transition Metal Oxide Nanomaterials
- Microfluidic and Capillary Electrophoresis Applications
- Integrated Circuits and Semiconductor Failure Analysis
- Molecular Junctions and Nanostructures
- Advanced Surface Polishing Techniques
- Analytical Chemistry and Sensors
- Silicone and Siloxane Chemistry
- Metal-Organic Frameworks: Synthesis and Applications
- Advanced Memory and Neural Computing
- Porphyrin and Phthalocyanine Chemistry
- Advanced Nanomaterials in Catalysis
- Photonic and Optical Devices
- Chemical Synthesis and Reactions
- Force Microscopy Techniques and Applications
National Centre of Scientific Research "Demokritos"
2016-2025
Center for NanoScience
2022
National Council for Scientific Research
2021
National Hellenic Research Foundation
1998-2010
National Technical University of Athens
2010
Institute of Microelectronics
2009
IMEC
2006
Institut des Matériaux Jean Rouxel
2004
University of Patras
2002
Institute of Informatics of the Slovak Academy of Sciences
2002
Molybdenum oxide is used as a low-resistance anode interfacial layer in applications such organic light emitting diodes and photovoltaics. However, little known about the correlation between its stoichiometry electronic properties, work function occupied gap states. In addition, despite fact that knowledge of exact paramount importance, few studies have appeared literature discussing how this can be controlled to permit desirable modification oxide's structure. This aims investigate...
Abstract Textile electronics embedded in clothing represent an exciting new frontier for modern healthcare and communication systems. Fundamental to the development of these textile is fibers forming cloths into electronic devices. An fiber must undergo diverse scrutiny its selection a multifunctional textile, viz., from material device architecture, wearability mechanical stresses, environmental compatibility end‐use management. Herein, performance requirements fiber‐shaped are reviewed...
In this work a hydrogenated under-stoichiometric tungsten oxide is introduced as an efficient anode interlayer in organic photovoltaics (OPVs). The benefits of hydrogen incorporation into the lattice for obtaining desirable properties oxides are explored. These include occupation gap states near Fermi level, which may facilitate charge transport, and maintenance high function, nearly similar to that stoichiometric oxide, contributes formation large interfacial dipole at interface enhances...
A low cost, temperature process for sealing microfluidic devices composed of at least one organic polymeric substrate is presented. The based on the surface modification by means a silane solution, resulting in irreversible bonding. It generic method bonding polymeric/plastic substrates, bare or structured ones, such as poly(methylmethacrylate) (PMMA), polystyrene (PS) epoxy-type polymers, to Si-containing poly(dimethylsiloxane) (PDMS), Si and glass. In case that between polymer (PMMA, PS,...
Light-controlled drug delivery systems constitute an appealing means to direct and confine release spatiotemporally at the site of interest with high specificity. However, utilization light-activatable is hampered by lack suitable carriers that respond sharply visible light stimuli clinically relevant wavelengths. Here, a new class self-assembling, photo- pH-degradable polymers polyacetal family reported, which combined photochemical internalization control intracellular trafficking...
The present study is aimed at investigating the solid state reduction of a representative series Keggin and Dawson polyoxometalate (POM) films in contact with metallic (aluminum) electrode introducing them as highly efficient cathode interlayers organic optoelectronics. We show that, upon reduction, up to four electrons are transferred from POM clusters dependent on addenda substitution, whereas six electron was observed case type clusters. high degree their by Al found be vital importance...
Abstract Photodegradable polymers constitute an emerging class of materials that finds numerous applications in biotechnology, biomedicine, and nanoscience. This article highlights some the photodegradable form homopolymers, particles self‐assembled constructs solution, hydrogels for tissue engineering, photolabile biopatterning applications. Novel photochemistries have been combined with controlled polymerization methods, which result well‐defined exhibit light mediated often fragmentation...
Hybrid organic–inorganic films consisted of molecular layers a Keggin-structure polyoxometalate (POM: 12-tungstophosphoric acid, H3PW12O40) and 1,12-diaminododecane (DD) on 3-aminopropyl triethoxysilane (APTES)-modified silicon surface, fabricated via the layer-by-layer (LBL) self-assembly method are evaluated as materials for electronic devices. The effect fabrication process parameters, including primarily compositions deposition solutions, structural characteristics POM-based multilayers...
Abstract Here, we report on the dual functionality of tungsten oxide for application as an efficient electron and hole injection/transport layer in organic light‐emitting diodes (OLEDs). We demonstrate hybrid polymer (Hy‐PLEDs), based a polyfluorene copolymer, by inserting very thin partially reduced oxide, WO 2.5 , at polymer/Al cathode interface to serve injection transport layer. Significantly improved current densities, luminances, luminous efficiencies were achieved, primarily result...
The compatibility of polyoxometalates as hole extraction layers in single-junction organic photovoltaics and recombination polymer tandem cells is demonstrated.
The surface passivation effect of SF<sub>6</sub> plasma on ZnO films for application in polymer solar cells is demonstrated.
Correction for ‘Hydrogenated under-stoichiometric tungsten oxide anode interlayers efficient and stable organic photovoltaics’ by M. Vasilopoulou <italic>et al.</italic>, <italic>J. Mater. Chem. A</italic>, 2014, <bold>2</bold>, 1738–1749.
Abstract As organic solar cells (OSCs) and perovskite (PVSCs) move closer to commercialization, further efforts toward optimizing both cell efficiency stability are needed. interfaces strongly affect device performance degradation processes, interfacial engineering by employing various materials as hole transport layers (HTLs) electron (ETLs) has been a very active field of research in OSCs PVSCs. Among them, inorganic exhibit significant advantages promoting due their excellent charge...
Organic solar cells based on nonfullerene acceptors have recently witnessed a significant rise in their power conversion efficiency values. However, they still suffer from severe instability issues, especially an inverted device architecture the zinc oxide bottom electron transport layers. In this work, we insert pyrene-bodipy donor–acceptor dye as thin interlayer at photoactive layer/zinc interface to suppress degradation reaction of acceptor caused by photocatalytic activity oxide....
We report on the effect of lithium doping zinc oxide used as electron-transport layer in organic solar cells based both fullerene and non-fullerene acceptors. The experimental theoretical results indicate that ions intercalated within ZnO lattice dopants replace interstitial defects act trap states give rise to a higher electron conductivity without significantly altering work function valence band edge. enhanced carrier extraction/collection efficiency, suppressed bimolecular interface...
Highly efficient and stable organic photovoltaic (OPV) cells are demonstrated by incorporating solution‐processed hydrogen molybdenum bronzes as anode interlayers. The synthesized using a sol‐gel method with the critical step being partial oxide reduction/hydrogenation an alcohol‐based solvent. Their composition, stoichiometry, electronic properties strongly correlate annealing process to which films subjected after spin coating. Hydrogen moderate degree of reduction found be highly...
Herein we report on enhanced organic solar cell performance through the incorporation of cathode interfacial layers consisting self-organized porphyrin nanostructures with a face-on configuration. In particular, water/methanol-soluble molecule, free base meso-tetrakis(1-methylpyridinium-4-yl)porphyrin chloride, is employed as novel interlayer in bulk heterojunction photovoltaics. It demonstrated that self-organization this compound into aggregates which molecules adopt face-to-face...
In this letter, highly efficient hole injection was demonstrated in only devices based on organic semiconductors with different highest occupied molecular orbital level and transport properties. The barrierless achieved by using a substoichiometric MoOx thin film (consisting of 65% Mo+6 35% Mo+5) as higly effective anode interfacial layer. current these found to be space charge limited, due the formation ohmic contact via excellent band alignment through gap states at ITO/MoOx MoOx/organic...
The reduction in electronic recombination losses by the passivation of surfaces is a key factor enabling high‐efficiency solar cells. Here strategy to passivate surface trap states TiO 2 films used as cathode interlayers organic photovoltaics (OPVs) through applying alumina (Al O 3 ) or zirconia (ZrO insulating nanolayers thermal atomic layer deposition (ALD) investigated. results suggest that traps are oxygen vacancies, which cause undesirable and high electron extraction barrier, reducing...
A glimpse of light is all it takes: Polymers that undergo main-chain scission at remarkably low photolysis energies were developed as efficient photodegradable substrates for safe laser-mediated cell detachment and patterning. The polymers, which contain acetal or ketal units in their backbone along with suitable absorbing groups, underwent fast degradation to release live cells upon irradiation an excimer laser (see picture). Detailed facts importance specialist readers are published...