A5062813953- Organic Electronics and Photovoltaics
- Conducting polymers and applications
- Molecular Junctions and Nanostructures
- Organic Light-Emitting Diodes Research
- Advanced Chemical Physics Studies
- Electron Spin Resonance Studies
- Spectroscopy and Quantum Chemical Studies
- Fullerene Chemistry and Applications
- Molecular Spectroscopy and Structure
- Porphyrin and Phthalocyanine Chemistry
University of Cambridge
2024
University College London
2017-2022
Transient absorption and time-resolved EPR spectroscopy show an ultra-fast spin-mixing CT state in a small diketopyrrolopyrrole-based molecule blended with fullerene.
The spatial separation of<bold>PCPDT-sFCN</bold>'s donor and orthogonal acceptor motifs allows efficient photogeneration of extraordinarily long-lived charge carriers in the pristine polymer, providing an important step towards single-material optoelectronics.
The bimolecular recombination characteristics of conjugated polymer poly[(4,4'-bis(2-ethylhexyl)dithieno[3,2-b:2',3'-d]silole)-2,6-diyl-alt-(2,5-bis 3-tetradecylthiophen-2-yl thiazolo 5,4-d thiazole)-2,5diyl] (PDTSiTTz) blended with the fullerene series PC60BM, ICMA, ICBA, and ICTA have been investigated using microsecond femtosecond transient absorption spectroscopy, in conjunction electroluminescence measurements ambient photoemission spectroscopy. non-Langevin PDTSiTTz allows an...
Triplet states are ubiquitous in organic electronics and their properties increasingly being exploited to enhance device efficiencies. The difficulty accurately probing triplet dictates that more fundamental understanding is required of properties. In this work, a hybrid co-polymer poly(9,9-dioctylfluorene-co-benzothiadiazole) (F8BT) with 10% by weight zinc porphyrin was synthesized transient absorption spectroscopy study performed. It observed dual energy-transfer mechanism active, whereby...
Singlet fission (SF) and triplet-triplet annihilation upconversion (TTA-UC) nominally enable the interconversion of higher-energy singlet states with two lower-energy triplet vice versa, both processes having envisaged application for enhanced solar power devices. The mechanism SF/TTA-UC involves a complex array different multiexcitonic triplet-pair that are coupled by exchange interaction to varying extents. In this work family bounded intramolecular SF materials, based upon chromophore...
Diketopyrrolopyrrole (DPP) is one of the most common building blocks for small molecules and conjugated polymers designed organic electronic applications. Transient absorption spectroscopy (TAS) time-resolved electron paramagnetic resonance (TR-EPR) were used to examine bulk heterojunction blend films a diketopyrrolopyrrole-based molecule, TDPP, with fullerene derivatives PC60BM PC70BM. Following pulsed laser excitation, spectral signatures anion TDPP triplet state are observed on picosecond...