A5103210300- Organic Electronics and Photovoltaics
- Conducting polymers and applications
- Advanced Chemical Sensor Technologies
- Perovskite Materials and Applications
- Analytical Chemistry and Sensors
- Gas Sensing Nanomaterials and Sensors
- Ionic liquids properties and applications
- Laser Design and Applications
- Advanced Battery Technologies Research
- Advanced battery technologies research
- Fuel Cells and Related Materials
- Electrochemical Analysis and Applications
- Chalcogenide Semiconductor Thin Films
- Analytical chemistry methods development
- Combustion and Detonation Processes
- Radioactive element chemistry and processing
- Energetic Materials and Combustion
- Chemical Reactions and Isotopes
- Mass Spectrometry Techniques and Applications
- Organic Light-Emitting Diodes Research
- Acoustic Wave Resonator Technologies
- solar cell performance optimization
- Molecular Junctions and Nanostructures
- Arsenic contamination and mitigation
- Luminescence and Fluorescent Materials
Imperial College London
1935-2024
Centre for Process Innovation
2021
Transnational Press London
2020
Plastic Electronics (Netherlands)
2020
University of Waterloo
2015
Wilfrid Laurier University
2009
H. J. Emeléus and K. Stewart, Trans. Faraday Soc., 1936, 32, 1577 DOI: 10.1039/TF9363201577
Semiconducting polymers with oligoethylene glycol (OEG) sidechains have attracted strong research interest for organic electrochemical transistor (OECT) applications. However, key molecular design rules high-performance OECTs via efficient mixed electronic/ionic charge transport are still unclear. In this work, new glycolated copolymers (gDPP-TTT and gDPP-TTVTT) diketopyrrolopyrrole (DPP) acceptor thiophene (T) vinylene (V) thiophene-based donor units synthesized characterized accumulation...
Electric-field driven chemical doping modulation in a solution-processed organic semiconductor and solid-state ionic liquid blend response to volatile compounds provides an exciting opportunity facilitate low-power gas sensors.
Functionalized polyethyleneimines that are compatible with non-fullerene acceptors have been developed by protecting the reactive amine groups, leading to solar cells high power conversion efficiency and enhanced thermal stability.
Understanding charge carrier extraction from the perovskite photoactive layer is critical to optimizing design of solar cells. Herein, we demonstrate a simple time-resolved photoluminescence method characterize kinetics transport across bulk and transfer interlayers, elucidating dependence these dynamics on film thickness, grain boundaries (GBs), interlayers. Using asymmetric laser excitation, selectively probe by generating charges both close far heterojunction interface correlate results...
Abstract Polarons exist when charges are injected into organic semiconductors due to their strong coupling with the lattice phonons, significantly affecting electronic charge‐transport properties. Understanding formation and (de)localization of polarons is therefore critical for further developing as a future electronics platform. However, there very few studies reported in this area. In particular, no direct situ monitoring polaron identification its dependence on molecular structure impact...
Abstract Glycol sidechains are often used to enhance the performance of organic photoconversion and electrochemical devices. Herein, we study their effects on electronic states properties. We find that polymer glycolation not only induces more disordered packing, but also results in a higher reorganisation energy due localised π -electron density. Transient absorption spectroscopy femtosecond stimulated Raman utilised monitor structural relaxation dynamics coupled excited state formation...
A small molecule additive, dodecylbenzenesulfonate (DBSA), is added to the electrolyte in OECTs improve device performance.
The application of computational chemistry to studies in geochemistry is increasingly becoming invaluable explaining experimentally observed trends for surface interactions pollutants with sorbents ubiquitous the environment. We report results on factors that affect force constant AsO x bonds As(V)-containing compounds relevant geochemical environments. Geometries, atomic charges, and stretching frequencies –AsO H x–1 (x = 2– 4) moieties these molecules were calculated using semi-empirical...
Abstract A key challenge in the development of organic mixed ionic‐electronic conducting materials (OMIEC) for high performance electrochemical transistors is their stable ambient. When operating aqueous electrolyte, potential reactions electrochemically injected electrons with air and water could hinder persistence, leading to a reduction charge transport. Here, impact deepening LUMO energy level series electron‐transporting semiconducting polymers evaluated, subsequently rendering most...
A blend of π-CPs and a solid-state ionic liquid provides an enlarged interfacial area at the molecular scale, thereby enabling two-terminal organic chemiresistors (TOCs) with fine discriminatory abilities for sub-ppm-level VOCs room temperature.
Recent developments of solution‐processed bulk‐heterojunction organic photovoltaic (OPV) cells have demonstrated power conversion efficiencies (PCEs) as high 18% for single‐junction devices. Such a PCE in addition to its desirable lightweight property and mechanical flexibility can realize specific small stowed volume, which are key considerations when choosing PV space missions. To take one important step forward, their resilience ionizing radiation should be well studied. Herein, the...
Π-conjugated polymers (π-CPs) blended with ionic liquids (ILs) have shown great potential for noninvasive diagnostics by transducing dielectric environmental changes induced volatile organic compound (VOC) biomarkers into distinct electrical signals. However, the role of ILs in VOC sensing remains unclear, limiting further development sensors real commercialization. Herein, key detection and discrimination mechanisms π-CP:IL are identified. Three different forming either liquid or solid...