A5090427477- Organic Electronics and Photovoltaics
- Conducting polymers and applications
- Perovskite Materials and Applications
- Organic Light-Emitting Diodes Research
- Analytical Chemistry and Sensors
- Molecular Junctions and Nanostructures
- X-ray Diffraction in Crystallography
- Crystallization and Solubility Studies
- Thin-Film Transistor Technologies
- Synthesis and Properties of Aromatic Compounds
- Luminescence and Fluorescent Materials
- Fullerene Chemistry and Applications
- Advanced Sensor and Energy Harvesting Materials
- Advanced Chemical Physics Studies
- Porphyrin and Phthalocyanine Chemistry
- Spectroscopy and Quantum Chemical Studies
- Surface Chemistry and Catalysis
- Chalcogenide Semiconductor Thin Films
- Photochemistry and Electron Transfer Studies
- Electrochemical sensors and biosensors
- Advanced Thermoelectric Materials and Devices
- Machine Learning in Materials Science
- Molecular Sensors and Ion Detection
- Advanced Memory and Neural Computing
- Organic and Molecular Conductors Research
Queen Mary University of London
2016-2025
Sigma Tau (Italy)
2024
University of Warwick
2024
University of Michigan
2024
Michigan United
2024
University of North Carolina at Chapel Hill
2024
Jingchu University of Technology
2024
Southern University of Science and Technology
2024
Soochow University
2024
Ajou University
2023
Dalton is a powerful general-purpose program system for the study of molecular electronic structure at Hartree-Fock, Kohn-Sham, multiconfigurational self-consistent-field, Møller-Plesset, configuration-interaction, and coupled-cluster levels theory. Apart from total energy, wide variety properties may be calculated using these electronic-structure models. Molecular gradients Hessians are available geometry optimizations, dynamics, vibrational studies, whereas magnetic resonance optical...
The active layer in a solution processed organic photovoltaic device comprises light absorbing electron donor semiconductor, typically polymer, and an accepting fullerene acceptor. Although there has been huge effort targeted to optimize the absorbing, energetic, transport properties of material, fullerenes remain as exclusive acceptor all high performance devices. Very recently, some new non-fullerene acceptors have demonstrated outperform comparative This Account describes this progress,...
Abstract Solution-processed organic photovoltaics (OPV) offer the attractive prospect of low-cost, light-weight and environmentally benign solar energy production. The highest efficiency OPV at present use low-bandgap donor polymers, many which suffer from problems with stability synthetic scalability. They also rely on fullerene-based acceptors, themselves have issues cost, limited spectral absorption. Here we a new non-fullerene acceptor that has been specifically designed to give improved...
A novel small molecule, FBR, bearing 3-ethylrhodanine flanking groups was synthesized as a nonfullerene electron acceptor for solution-processed bulk heterojunction organic photovoltaics (OPV). straightforward synthesis route employed, offering the potential large scale preparation of this material. Inverted OPV devices employing poly(3-hexylthiophene) (P3HT) donor polymer and FBR gave power conversion efficiencies (PCE) up to 4.1%. Transient steady state optical spectroscopies indicated...
Significance Side-chain engineering is a versatile tool to modify the processability, as well physical, electrical, and optical properties, of conjugated polymers. This approach used tailor operating mechanism electrolyte-gated organic transistors, allowing for facile bulk doping therefore efficient modulation transistor channel conductance. Such transistors combine fast response with high current-to-voltage signal transduction necessary active sensing low-power circuit applications.
The design, synthesis, and characterization of a series diketopyrrolopyrrole-based copolymers with different chalcogenophene comonomers (thiophene, selenophene, tellurophene) for use in field-effect transistors organic photovoltaic devices are reported. effect the heteroatom substitution on optical, electrochemical, properties charge carrier mobilities these polymers is discussed. results indicate that by increasing size chalcogen atom (S < Se Te), polymer band gaps narrowed mainly due to...
The organic electrochemical transistor (OECT), capable of transducing small ionic fluxes into electronic signals in an aqueous environment, is ideal device to utilize bioelectronic applications. Currently, most OECTs are fabricated with commercially available conducting poly(3,4-ethylenedioxythiophene) (PEDOT)-based suspensions and therefore operated depletion mode. Here, we present a series semiconducting polymers designed elucidate important structure–property guidelines required for...
Abstract Organic electrochemical transistors (OECTs) are receiving significant attention due to their ability efficiently transduce biological signals. A major limitation of this technology is that only p-type materials have been reported, which precludes the development complementary circuits, and limits sensor technologies. Here, we report first ever n-type OECT, with relatively balanced ambipolar charge transport characteristics based on a polymer supports both hole electron along its...
The prospect of using low cost, high throughput material deposition processes to fabricate organic circuitry and solar cells continues drive research towards improving the performance semiconducting materials utilized in these devices. Conjugated aromatic polymers have emerged as a leading candidate semiconductor class, due their combination amenability processing reasonable electrical optical performance. Challenges remain, however, further improve charge carrier mobility for transistor...
Two novel indacenodithiophene (IDT) based donor–acceptor conjugated polymers for use in organic field effect transistors and photovoltaic devices are synthesized characterized. The of inclusion two fluorine atoms on the acceptor portion polymer is thoroughly investigated via a range techniques. inductively withdrawing mesomerically donating properties result decrease highest occupied molecular orbital (HOMO), with little lowest unoccupied (LUMO) as demonstrated through density functional...
Molecular doping-the use of redox-active small molecules as dopants for organic semiconductors-has seen a surge in research interest driven by emerging applications sensing, bioelectronics, and thermoelectrics. However, molecular doping carries with it several intrinsic problems stemming directly from the character these materials. A recent breakthrough was technique based on ion-exchange, which separates redox charge compensation steps process. Here, equilibrium kinetics ion exchange model...
The energetic driving force required to drive charge separation across donor/acceptor heterojunctions is a key consideration for organic optoelectronic devices. Herein we report series of transient absorption and photocurrent experiments as function excitation wavelength temperature two low-band-gap polymer/fullerene blends study the mechanism at interface. For blend that exhibits smallest LUMO energy level offset, quantum yield falls photon reduced toward band gap, but bound, interfacial...
Singlet molecular oxygen (a(1)Delta(g)) has been produced and optically detected in time-resolved experiments upon nonlinear two-photon excitation of a photosensitizer dissolved water. For given sensitizer, specific functional groups that impart water solubility give rise to larger absorption cross sections are, many cases, not conducive the production singlet high yield. This issue involves competing influence intramolecular charge transfer can be pronounced aqueous systems; more...
A combined quantum mechanics/molecular mechanics (QM/MM) method is described, where the polarization between solvent and solute accounted for using a self-consistent scheme linear in polarization. The QM/MM implemented calculation of energies molecular response properties including quadratic functions density-functional theory (DFT) Hartree-Fock (HF) theory. Sample calculations presented ground-state energies, first-order properties, excitation excited state polarizabilities,...
We report the synthesis of a novel ladder-type fused ring donor, dithienogermolodithiophene, in which two thieno[3,2-b]thiophene units are held coplanar by bridging dialkyl germanium. Polymerization this extended monomer with N-octylthienopyrrolodione Stille polycondensation afforded polymer, pDTTG-TPD, an optical band gap 1.75 eV combined high ionization potential. Bulk heterojunction solar cells based upon pDTTG-TPD:PC(71)BM blends efficiencies up to 7.2% without need for thermal annealing...
A combination of improved understanding molecular design criteria and polymer purification techniques, as well optimised fabrication techniques device surface treatments, have driven recent advances in the performance semiconducting polymers for transistor applications. This development has allowed polymer-based devices to reach parity with best values obtained small molecule evaporated devices. Herein, we present most work on solution processable high mobility donor–acceptor type polymers....
The lifetime of singlet excitons in conjugated polymer films is a key factor taken into account during organic solar cell device optimization. It determines the exciton diffusion lengths and has direct impact on photocurrent generation by devices. However, very little known about material properties controlling lifetimes excitons, with most our knowledge originating from studies small molecules. Herein, we provide brief summary nature excited states then present an analysis 16 semiconducting...
TiO<sub>2</sub>layer made by e-beam induced evaporation is demonstrated as an ETL in high efficiency planar junction perovskite solar cells.
A novel photoactive polymer with two different molecular weights is reported, based on a new building block: thieno[3,2-b][1]benzothiophene isoindigo. Due to the improved crystallinity, optimal blend morphology, and higher charge mobility, solar-cell devices of high-molecular-weight exhibit superior performance, affording efficiencies 9.1% without need for additives, annealing, or additional extraction layers during device fabrication.