A5029752032- Organic Electronics and Photovoltaics
- Conducting polymers and applications
- Molecular Junctions and Nanostructures
- Covalent Organic Framework Applications
- Perovskite Materials and Applications
- Advanced Sensor and Energy Harvesting Materials
- Crystallization and Solubility Studies
- X-ray Diffraction in Crystallography
- Thin-Film Transistor Technologies
- Dendrimers and Hyperbranched Polymers
- Fatigue and fracture mechanics
- High Temperature Alloys and Creep
- Synthesis and properties of polymers
- Surface Chemistry and Catalysis
- Advanced Photocatalysis Techniques
- Nuclear Materials and Properties
- Force Microscopy Techniques and Applications
- Photochemistry and Electron Transfer Studies
- Electron and X-Ray Spectroscopy Techniques
- Metal-Organic Frameworks: Synthesis and Applications
- 2D Materials and Applications
- Electrochemical sensors and biosensors
Hasselt University
2025
IMEC
2025
University of Bern
2021-2023
Technische Universität Dresden
2017-2022
Visvesvaraya National Institute of Technology
2020
Abstract Engineering conducting polymer thin films with morphological homogeneity and long-range molecular ordering is intriguing to achieve high-performance organic electronics. Polyaniline (PANI) has attracted considerable interest due its appealing electrical conductivity diverse chemistry. However, the synthesis of large-area PANI film control crystallinity thickness remain challenging because complex intermolecular interactions aniline oligomers. Here we report a facile route combining...
Abstract Organic photovoltaics based on non-fullerene acceptors (NFAs) show record efficiency of 16 to 17% and increased photovoltage owing the low driving force for interfacial charge-transfer. However, potentially slows down charge generation, leading a tradeoff between voltage current. Here, we disentangle intrinsic charge-transfer rates from morphology-dependent exciton diffusion series polymer:NFA systems. Moreover, establish influence energetics electron hole transfer separately. We...
Abstract Single‐layer and multi‐layer 2D polyimine films have been achieved through interfacial synthesis methods. However, it remains a great challenge to achieve the maximum degree of crystallinity in polyimines, which largely limits long‐range transport properties. Here we employ surfactant‐monolayer‐assisted (SMAIS) method for successful preparation porphyrin triazine containing polyimine‐based polymer (PI‐2DP) with square hexagonal lattices, respectively. The synthetic PI‐2DP are...
We review the Stille coupling synthesis of P(DPP2OD-T) (Poly[[2,5-di(2-octyldodecyl)pyrrolo[3,4-c]pyrrole-1,4(2H,5H)-dione-3,6-diyl]-alt-[2,2′:5′,2″-terthiophene-5,5″-diyl]]) and show that high-quality, high molecular weight polymer chains are already obtained after as little 15 min reaction time. The results UV–vis spectroscopy, grazing incidence wide-angle X-ray scattering (GIWAXS), atomic force microscopy longer times unnecessary do not produce any improvement in film quality. achieve...
An understanding of the factors limiting open-circuit voltage (Voc) and related photon energy loss mechanisms is critical to increase power conversion efficiency (PCE) small-molecule organic solar cells (OSCs), especially those with near-infrared (NIR) absorbers. In this work, two NIR boron dipyrromethene (BODIPY) molecules are characterized for application in planar (PHJ) bulk (BHJ) heterojunction OSCs. When H atoms substituted by F on peripheral phenyl rings molecules, molecular...
Quasi-2D (q2D) conjugated polymers (CPs) are that consist of linear CP chains assembled through non-covalent interactions to form a layered structure. In this work, the synthesis novel crystalline q2D polypyrrole (q2DPPy) film at air/H2 SO4 (95%) interface is reported. The unique interfacial environment facilitates chain extension, prevents disorder, and results in crystalline, assembly protonated quinoidal with fully extended conformation its domains. This structure features highly...
Abstract The molecular order of the photo‐active molecules in organic solar cells and exciplex light emitting diodes based on donor–acceptor mixed systems has major influence performance. However, it is usually investigated only by indirect measurements or simulations. Here, low‐temperature scanning probe microscopy used to directly image assembly, intermolecular bonding configuration, domain interfaces vacuum‐deposited donor acceptor BF‐DPB BPyMPM different single crystalline substrates...
Abstract Single‐layer and multi‐layer 2D polyimine films have been achieved through interfacial synthesis methods. However, it remains a great challenge to achieve the maximum degree of crystallinity in polyimines, which largely limits long‐range transport properties. Here we employ surfactant‐monolayer‐assisted (SMAIS) method for successful preparation porphyrin triazine containing polyimine‐based polymer (PI‐2DP) with square hexagonal lattices, respectively. The synthetic PI‐2DP are...
A blend of a low-optical-gap diketopyrrolopyrrole polymer and fullerene derivative, with near-zero driving force for electron transfer, is investigated. Using femtosecond transient absorption electroabsorption spectroscopy, the charge transfer (CT) recombination dynamics as well early-time transport are quantified. Electron ultrafast, consistent Marcus-Levich-Jortner description. However, significant unusually short excited (S1 ) CT state lifetimes (≈14 ps) observed. At low S1 -CT offset,...
Diketopyrrolopyrrole (DPP)-based donor–acceptor copolymers have gained a significant amount of research interest in the organic electronics community because their high charge carrier mobilities field-effect transistors (OFETs) and ability to harvest near-infrared (NIR) photons solar cells. In this study, we synthesized four DPP-based with variations donor unit branching point solubilizing alkyl chains (at second or sixth carbon position). Grazing incidence wide-angle X-ray scattering...
Semiconducting donor-acceptor copolymers are considered to be a promising material class for solution-coated, large-scale organic electronic applications. A large number of works have shown that the best-performing field-effect transistors (OFETs) obtained on low-surface-energy substrates. The meniscus instabilities occur when coating such surfaces considerably limit effective deposition speeds. This represents limiting factor upscaling device fabrication mass production, an issue needs...
The nanoscale morphology of bulk heterojunctions is highly important for the charge dissociation and transport in organic solar cells ultimately defines performance cell. visualization this nano-morphology terms domain size polymer orientation a fast straightforward way therefore great interest to evaluate suitability film efficient cells. Here, we demonstrate that different blends poly(3-hexylthiophene-2,5-diyl) (P3HT) phenyl-C61-butyric acid methyl ester (PCBM) can be imaged analyzed by...
Diketopyrrolopyrrole polymers (DPP's) are an important class of donor materials for organic solar cells owing to their supreme charge carrier mobility and optical absorption which extends into the NIR (until 950-1000 nm). The former allows making efficient with rather thick active layers while latter makes them a good candidate be used in tandem devices. In this study, we synthesized four different DPP thiophene thienothiophene conjugation segments backbone. For each backbones, changed...