A5025542172- Organic Electronics and Photovoltaics
- Conducting polymers and applications
- Perovskite Materials and Applications
- Organic Light-Emitting Diodes Research
- Thin-Film Transistor Technologies
- Molecular Junctions and Nanostructures
- Semiconductor materials and devices
- Fullerene Chemistry and Applications
- Analytical Chemistry and Sensors
- Electronic and Structural Properties of Oxides
- solar cell performance optimization
- Catalytic Processes in Materials Science
- Porphyrin and Phthalocyanine Chemistry
- Semiconductor materials and interfaces
- Force Microscopy Techniques and Applications
- Organic Chemistry Cycloaddition Reactions
- Photovoltaic System Optimization Techniques
- Transition Metal Oxide Nanomaterials
- Advanced Memory and Neural Computing
- Synthesis of heterocyclic compounds
- Integrated Circuits and Semiconductor Failure Analysis
- Quantum Dots Synthesis And Properties
- ZnO doping and properties
- Nanowire Synthesis and Applications
- Luminescence and Fluorescent Materials
Hasselt University
2012-2023
IMEC
2009-2023
Institute for Materials Research, Tohoku University
2014-2018
Material (Belgium)
2015
Imec the Netherlands
2014
KU Leuven
2009
Organic photovoltaics (OPV) represent a thin‐film PV technology that offers attractive prospects for low‐cost and aesthetically appealing (colored, flexible, uniform, semitransparent) solar cells are printable on large surfaces. In bulk heterojunction (BHJ) OPV devices, organic electron donor acceptor molecules intimately mixed within the photoactive layer. Since 2005, power conversion efficiency of said devices has increased substantially due to insights in underlying physical processes,...
Organic photovoltaics represent a promising thin-film solar cell technology with appealing mechanical, aesthetical, and cost features. In recent years, strong growth in power conversion efficiency (to over 10%) has been realized for organic cells through extensive material device research. To be competitive the renewable energy market, further improvements are mandatory though, both respect to lifetime. High intrinsic stability of photoactive layer is obviously crucial requirement long...
A solution processable narrow bandgap polymer composed of alternating 2,5-dithienylthiazolo[5,4-d]thiazole and asymmetrically alkyl-substituted 4H-cyclopenta[2,1-b:3,4-b′]dithiophene units (PCPDT-DTTzTz) was synthesized by Suzuki polycondensation the donor–acceptor copolymer thoroughly characterized. Thermal analysis X-ray diffraction studies disclosed semicrystalline nature material. When blended with PC71BM integrated in bulk heterojunction organic solar cells, a moderate power conversion...
To improve the thermal stability of polymer:fullerene bulk heterojunction solar cells, a new polymer, poly[2-methoxy-5-(2′-phenylethoxy)-1,4-phenylenevinylene] (MPE-PPV), has been designed and synthesized, which showed an increased glass transition temperature (Tg) 111 °C. The characteristics phase behavior MPE-PPV:[6,6]-phenyl C61-butyric acid methyl ester ([60]PCBM) blends were investigated by means modulated differential scanning calorimetry rapid heating–cooling calorimetry....
Abstract In the field of polymer solar cells, improving photovoltaic performance has been main driver over past decade. To achieve high power conversion efficiencies, a plethora new photoactive donor polymers and fullerene derivatives have developed blended together in bulk heterojunction active layers. Simultaneously, further optimization device architecture is also major importance. this respect, we report on use specific types electron transport layers to boost inherent I – V properties...
Organic photodetectors made from a BAI-based near-infrared copolymer reach high detectivities of 10<sup>12</sup> Jones and low dark currents 10<sup>−7</sup> A cm<sup>−2</sup>.
Abstract Organic photovoltaics (OPV) have attracted great interest as a solar cell technology with appealing mechanical, aesthetical, and economies‐of‐scale features. To drive OPV toward economic viability, low‐cost, large‐scale module production has to be realized in combination increased top‐quality material availability minimal batch‐to‐batch variation. this extent, continuous flow chemistry can serve powerful tool. In contribution, protocol is optimized for the high performance...
When state-of-the-art bulk heterojunction organic solar cells with ideal morphology are exposed to prolonged storage or operation at elevated temperatures, a thermally induced disruption of the active layer blend can occur, in form separation donor and acceptor domains, leading diminished photovoltaic performance. Toward long-term use real-life conditions, an important challenge is, therefore, development devices stable morphology. Several routes being explored, ranging from high glass...
Conjugated polyelectrolyte (CPE) interfacial layers present a powerful way to boost the I–V characteristics of organic photovoltaics. Nevertheless, clear guidelines with respect structure high-performance interlayers are still lacking. In this work, impedance spectroscopy is applied probe dielectric permittivity series polythiophene-based CPEs. The presence ionic pendant groups grants formation capacitive double layer, boosting charge extraction and device efficiency. A counteracting effect...
Quinoxaline fluorination leads to enhanced properties and efficiencies in PCPDTQx-based polymer solar cells.
<italic>N</italic>-Acylation of dithieno[3,2-<italic>b</italic>:2′,3′-<italic>d</italic>]pyrrole (DTP) leads to enhanced open-circuit voltages and hence higher power conversion efficiencies in polymer solar cells.
The performance of polymer solar cells is strongly dependent on the morphology photoactive layer, which can be optimized by tuning side chain pattern. Whereas most studies focus length and bulkiness, density receives much less attention. In this work, effect number chains PCPDTQx(2F) low bandgap copolymers material properties cell characteristics investigated. active layer affected, affording more favorable finely intermixed blends when decreasing density. As a result, efficiency increases...
Direct arylation affords organic semiconductors enabling high solar cell efficiency upon careful removal of the ‘miss-coupled’ side products.
Conjugated polyelectrolyte–surfactant cathodic interface layers lead to improved power conversion efficiencies in organic solar cells.
Fullerene and fullerene-free organic photovoltaics.
Strong indications for combustion in films illustrated by morphological properties of the functional MoO<sub>3</sub>layers.
The stability of polymer solar cells (PSCs) can be influenced by the introduction particular moieties on conjugated side chains. In this study, two series donor-acceptor copolymers, based bis(thienyl)dialkoxybenzene donor and benzo[c][1,2,5]thiadiazole (BT) or thiazolo[5,4-d]thiazole (TzTz) acceptor units, were selected toward effective device scalability roll-coating. influence partial exchange (5% 10%) solubilizing 2-hexyldecyloxy alternative 2-phenylethoxy groups efficiency was...
Conjugated poly(3‐hexylthiophene) copolymer derivatives containing 10% appended porphyrin moieties are prepared using a supramolecular approach toward applications in organic electronics. The self‐assembled polythiophene–porphyrin copolymers synthesized by coordination of the porphyrinato central zinc ions to imidazole‐functionalized polythiophene side chains. Evidence for self‐assembly process is provided 1 H NMR spectroscopy, single crystal X‐ray diffraction, and optical absorption...
The interplay of interdiffusion and crystallization in HfO2/Al2O3 superlattices during spike annealing at 1050 °C was studied using x-ray reflectivity diffraction. A transition thermal stability found as a function HfO2 thickness between 2.3 3.2 nm. This is due to crossover amorphous kinetics. For thin HfO2, Al2O3 interdiffuse subsequently crystallize HfAlOx into cubic-HfO2-like phase. thicker layers individually the monoclinic As consequence, suppressed because immiscibility HfO2.