Conformational Change on a Bithiophene-Based Copolymer Induced by Additive Treatment: Application in Organic Photovoltaics
| Autor: | Marco Cremona, Camilla Karla Brites Queiroz Martins de Oliveira, Natasha A. D. Yamamoto, O. D. Lourenco, Lucimara S. Roman, Harold C. Avila, Cleber F. N. Marchiori, Leandro Benatto, M. G. E. da Luz, Marlus Koehler |
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| Rok vydání: | 2017 |
| Předmět: |
chemistry.chemical_classification
Electron mobility Conformational change Fullerene Materials science Organic solar cell 02 engineering and technology Polymer 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences 0104 chemical sciences Surfaces Coatings and Films Electronic Optical and Magnetic Materials Solvent General Energy Chemical engineering chemistry Polymer chemistry Copolymer Physical and Theoretical Chemistry 0210 nano-technology Order of magnitude |
| Zdroj: | The Journal of Physical Chemistry C. 121:16035-16044 |
| ISSN: | 1932-7455 1932-7447 |
| Popis: | In recent years the use of solvent additives for fabrication of polymer-based solar cells has become an important procedure to induce morphological changes at the system nanoscale, a critical step to improve device performance. Yet the actual effects of those additives on the polymer’s backbone conformations (with coupled variations on the electronic structure) remain very elusive. By combining different experimental and theoretical techniques, we show that the use of the solvent additive 1,8-diiodooctane (DIO) might influence the conformation of poly[(9,9-dioctylfluorenyl-2,7-diyl)-co-bithiophene] (F8T2) chains resulting in improved properties of the film. We correlate this conformational variation with the photovoltaic response of F8T2:fullerene(C60) devices prepared using different DIO concentrations. We find that the efficiency of the devices increases more than 100%, and the hole mobility in the F8T2 films increases almost 1 order of magnitude with the use of DIO. A comparison between experimental da... |
| Databáze: | OpenAIRE |
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