Now showing items 1-12 of 12

    • BODIPY star-shaped molecules as solid state colour converters for visible light communications 

      Vithanage, Chiranthika Dimali Amarasinghe; Manousiadis, Pavlos; Sajjad, Muhammad Tariq; Rajbhandari, Sujan; Chun, Hyunchae; Orofino, Clara; Cortizo-Lacalle, Diego; Kanibolotsky, Alexander; Faulkner, Grahame; Findlay, Neil; O'Brien, Dominic; Skabara, Peter; Samuel, Ifor David William; Turnbull, Graham Alexander (2016-07-06) - Journal article
      In this paper we study a family of solid-state, organic semiconductors for visible light communications. The star-shaped molecules have a boron-dipyrromethene (BODIPY) core with a range of side arm lengths which control ...
    • Controlling exciton diffusion and fullerene distribution in photovoltaic blends by side chain modification 

      Sajjad, Muhammad Tariq; Ward, Alexander J.; Kästner, Christian; Ruseckas, Arvydas; Hoppe, Harald; Samuel, Ifor David William (2015-08-06) - Journal article
      The influence of crystallinity on exciton diffusion and fullerene distribution was investigated by blending amorphous and semicrystalline copolymers. We measured exciton diffusion and fluorescence quenching in such blends ...
    • Correlating photovoltaic properties of PTB7-Th:PC71BM blend to photophysics and microstructure as a function of thermal annealing 

      Krishnan Jagadamma, Lethy; Sajjad, Muhammad Tariq; Savikhin , Victoria; Toney, Michael; Samuel, Ifor D. W. (2017-07-28) - Journal article
      Selective optimisation of light harvesting materials and interface properties has brought breakthroughs in power conversion efficiency (11-12 %) of organic photovoltaics (OPVs). However to translate this promising efficiency ...
    • CuSCN nanowires as electrodes for p-type quantum dot sensitized solar cells : charge transfer dynamics and alumina passivation 

      Sajjad, Muhammad Tariq; Park, Jinhyung; Gaboriau, Dorian; Harwell, Jonathon R.; Odobel, Fabrice; Reiss, Peter; Samuel, Ifor D. W.; Aldakov, Dmitry (2018-03-08) - Journal article
      Quantum dot sensitized solar cells (QDSSCs) are a promising photovoltaic technology due to their low cost and simplicity of fabrication. Most QDSSCs have an n-type configuration with electron injection from QDs into TiO2, ...
    • Efficient eco-friendly inverted quantum dot sensitized solar cells 

      Park, Jinhyung; Sajjad, Muhammad Tariq; Jouneau, Pierre-Henri; Ruseckas, Arvydas; Faure-Vincent, Jérôme; Samuel, Ifor David William; Reiss, Peter; Aldakov, Dmitry (2016-01-21) - Journal article
      Recent progress in quantum dot (QD) sensitized solar cells has demonstrated the possibility of low-cost and efficient photovoltaics. However, the standard device structure based on n-type materials often suffers from slow ...
    • Exciton diffusion length and charge extraction yield in organic bilayer solar cells 

      Siegmund, Bernhard; Sajjad, Muhammad Tariq; Widmer, Johannes; Ray, Debdutta; Koerner, Christian; Riede, Moritz; Leo, Karl; Samuel, Ifor David William; Vandewal, Koen (2017-03-28) - Journal article
      A method for resolving the diffusion length of excitons and the extraction yield of charge carriers is presented based on the performance of organic bilayer solar cells and careful modeling. The technique uses a simultaneous ...
    • In situ formation and photo patterning of emissive quantum dots in organic small molecules 

      Bansal, Ashu K; Sajjad, Muhammad Tariq; Antolini, Francesco; Stroea, Lenuta; Gecys, Paulius; Raciukaitis, Gediminas; Andre, Pascal; Hirzer, Andreas; Schmidt, Volker; Ortolani, Luca; Toffanin, Stefano; Allard, Sybille; Scherf, Ullrich; Samuel, Ifor (2015) - Journal article
      Nanostructured composites of inorganic and organic materials are attracting extensive interest for electronic and optoelectronic device applications. Here we report a novel method for the fabrication and patterning of metal ...
    • Mercaptophosphonic acids as efficient linkers in quantum dot sensitized solar cells 

      Aldakov, D.; Sajjad, Muhammad Tariq; Ivanova, V.; Bansal, Ashu Kumar; Park, Jinhyung; Reiss, P.; Samuel, Ifor David William (2015-10-07) - Journal article
      Control over the deposition of quantum dots (QDs) on nanostructured semiconductors is very important for the photovoltaic performance of QD sensitized solar cells. The best control is typically achieved using bifunctional ...
    • A saturated red color converter for visible light communication using a blend of star-shaped organic semiconductors 

      Sajjad, Muhammad Tariq; Manousiadis, Pavlos; Orofino, Clara; Kanibolotsky, Alexander; Findlay, Neil; Rajbhandari, Sujan; Vithanage, Chiranthika Dimali Amarasinghe; Chun, Hyunchun; Faulkner, Graham; O'Brien, Dominic; Skabara, Peter; Turnbull, Graham Alexander; Samuel, Ifor David William (2017-01) - Journal article
      We report a study of blends of semiconducting polymers as saturated red color converters to replace commercial phosphors in hybrid LEDs for visible light communication (VLC). By blending two star-shaped organic semiconductor ...
    • Size dependence of efficiency of PbS quantum dots in NiO-based dye sensitised solar cells and mechanistic charge transfer investigation 

      Raissi, Mahfoudh; Sajjad, Muhammad Tariq; Pellegrin, Yann; Roland, Thomas Jean; Jobic, Stephane; Boujtita, Mohammed; Ruseckas, Arvydas; Samuel, Ifor D. W.; Odobel, Fabrice (2017-10-28) - Journal article
      Quantum dots (QDs) are very attractive materials for solar cells due to their high absorption coefficients, size dependence and easy tunability of their optical and electronic properties due to quantum confinement. ...
    • Tuning crystalline ordering by annealing and additives to study its effect on exciton diffusion in a polyalkylthiophene copolymer 

      Chowdhury, Mithun; Sajjad, Muhammad Tariq; Savikhin, Victoria; Hergue, Noemie; Sutija, Karina; Oosterhout, Stefan; Toney, Michael F; Dubois, Philippe; Ruseckas, Arvydas; Samuel, Ifor David William (2017) - Journal article
      The influence of various processing conditions on the singlet exciton diffusion is explored in films of a conjugated random copolymer poly-(3-hexylthiophene-co-3-dodecylthiophene) (P3HT-co-P3DDT) and correlated with the ...
    • Unprecedented strongly panchromic absorption from proton switchable iridium(III) azoimidazolate complexes 

      Henwood, Adam Francis; Hu, Yue; Sajjad, Muhammad Tariq; Thalluri, Venkata Visveswara Gopala Krishna; Ghosh, Sanjay Sanatan; Cordes, David Bradford; Slawin, Alexandra Martha Zoya; Samuel, Ifor David William; Robertson, Neil; Zysman-Colman, Eli (2015-12) - Journal article
      Two novel heteroleptic iridium(III) complexes bearing an aryldiazoimidazole ligand are reported. These complexes differ structurally with respect to the protonation state of the imidazole ring, but can be independently ...