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TopicsBio-inorganic organic hybrids Materials via self assembly Microelectronics/photonics Nanotechnology New biomaterials Next Generation Photovoltaics Next Generation Thin Films Revolutionary composites Tissue Engineering |
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Research Spot light
Designing and Developing Novel 1D and 2D Oligomers and Polymers with Cyano Substituents for application in Electroactive DevicesThe last two decades have seen a growing interest in the field of 'Organic Semiconductors' specifically for applications in Polymer Light Emitting Diodes (PLEDs), Thin Film Transistors (TFTs), and Photovoltaics (PVs). The current applications include screens on cell phones, digital cameras and camcorders and even for a new crop of affordable flat panel monitors. While there has been significant progress towards the commercialization of PLEDs, there is still a need to improve carrier mobility, specifically electron mobility. Our approach towards improving electron mobility involves the strategic design and development of organic materials incorporating electron withdrawing cyano substituents which have potential for ¦Ð- ¦Ð stacking. ¦Ð- ¦Ð stacking in organic semiconducting polymers and oligomers, increases delocalization of charge and increases carrier mobility by decreasing the activation energy for interchain carrier hopping. The cyano substituent improves the electron affinity(1), facilitates fine tuning of the highest occupied molecular orbital (HOMO) and the lowest unoccupied molecular orbital (LUMO) with respect to the work function of the electrodes and alters electronic properties. The ongoing work involves developing oligomers and polymers with electron withdrawing cyano substituents which exhibit ¦Ð-stacking, 2-dimensional delocalization of charge and improved charge injection and are promising for use in organic LEDs, TFTs and PVs. Recent publicationsN. C. Greenham, S. C. Moratti, D. D. C. Bradley, R. H. Friend, A. B. Holmes, Nature 365, 628-630 (Oct 14, 1993) Project StaffYashpal Bhandari
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