Long-range exciton transport in conjugated polymer nanofibers prepared by seeded growth.
Finnegan, John R
Boott, Charlotte E
Richter, Johannes M
Whittell, George R
American Association for the Advancement of Science
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Jin, X., Price, M., Finnegan, J. R., Boott, C. E., Richter, J. M., Rao, A., Menke, S., et al. (2018). Long-range exciton transport in conjugated polymer nanofibers prepared by seeded growth.. Science, 360 (6391), 897-900. https://doi.org/10.1126/science.aar8104
Easily processed materials with the ability to transport excitons over length scales of more than 100 nanometers are highly desirable for a range of light-harvesting and optoelectronic devices. We describe the preparation of organic semiconducting nanofibers comprising a crystalline poly(di-n-hexylfluorene) core and a solvated, segmented corona consisting of polyethylene glycol in the center and polythiophene at the ends. These nanofibers exhibit exciton transfer from the core to the lower-energy polythiophene coronas in the end blocks, which occurs in the direction of the interchain π-π stacking with very long diffusion lengths (>200 nanometers) and a large diffusion coefficient (0.5 square centimeters per second). This is made possible by the uniform exciton energetic landscape created by the well-ordered, crystalline nanofiber core.
Engineering and Physical Sciences Research Council (EP/K016520/1)
Engineering and Physical Sciences Research Council (EP/M005143/1)
Engineering and Physical Sciences Research Council (EP/M006360/1)
External DOI: https://doi.org/10.1126/science.aar8104
This record's URL: https://www.repository.cam.ac.uk/handle/1810/280338