Interplay among electronic characteristics, morphology and device efficiency in three fluorene alternated copolymers
| Autor: | Isabel R. Grova, Sandra M. Cassemiro, Lucimara S. Roman, Leni Akcelrud, Cristiano Zanlorenzi, Denis A. Turchetti, Natasha A. D. Yamamoto, Andreia G. Macedo |
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| Rok vydání: | 2016 |
| Předmět: |
Materials science
Fullerene Band gap 02 engineering and technology Fluorene 010402 general chemistry Cell morphology 01 natural sciences chemistry.chemical_compound Polymer chemistry Materials Chemistry Thiophene Copolymer chemistry.chemical_classification Mechanical Engineering Metals and Alloys Polymer 021001 nanoscience & nanotechnology Condensed Matter Physics 0104 chemical sciences Electronic Optical and Magnetic Materials chemistry Chemical engineering Mechanics of Materials 0210 nano-technology Science technology and society |
| Zdroj: | Synthetic Metals. 219:60-66 |
| ISSN: | 0379-6779 |
| Popis: | Aiming to evaluate the effect of chain length on the performance of photovoltaic devices, three alternated copolymers were tested. Fluorene, chosen as a common base for comparison was linked to thiophene (Th), ethylene dioxythiophene (EDOT), and benzothiadiazole (Bz). The three comonomers were selected from the most common units in photovoltaic polymers, with different electro-affinities. The electronic properties such as frontier levels and band gap were very similar, but the chain length varied considerably, exerting a strong effect on the cell morphology. That in turn determined the charge transport efficiency and surface contact between the polymer layer and the fullerene, resulting in better performance for the polymer with the highest molecular mass, which was not the result that would be anticipated, based on the difference of electronic affinity towards to the common unit, the fluorene. |
| Databáze: | OpenAIRE |
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