Molar Mass versus Polymer Solar Cell Performance: Highlighting the Role of Homocouplings
| Autor: | Tim Vangerven, Jeroen Drijkoningen, Wouter Maes, Alberto Salleo, Jean Manca, Dirk Vanderzande, Wouter Dierckx, Scott Himmelberger, Pieter Verstappen |
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| Rok vydání: | 2015 |
| Předmět: |
chemistry.chemical_classification
Fullerene Molar mass Materials science Organic solar cell General Chemical Engineering Dispersity General Chemistry Polymer Oligomer Polymer solar cell chemistry.chemical_compound chemistry Chemical engineering Materials Chemistry Molar mass distribution Organic chemistry |
| Zdroj: | Chemistry of Materials. 27:3726-3732 |
| ISSN: | 1520-5002 0897-4756 |
| DOI: | 10.1021/acs.chemmater.5b00939 |
| Popis: | Although a strong link between the molar mass of conjugated polymers and the performance of the resulting polymer:fullerene bulk heterojunction organic solar cells has been established on numerous occasions, a clear understanding of the origin of this connection is still lacking. Moreover, the usual description of molar mass and polydispersity does not include the shape of the polymer distribution, although this can have a significant effect on the device properties. In this work, the effect of molar mass distribution on photovoltaic performance is investigated using a combination of structural and electro-optical techniques for the state-of-the-art low bandgap copolymer PTB7. Some of the studied commercial PTB7 batches exhibit a bimodal distribution, of which the low molar mass fraction contains multiple homocoupled oligomer species, as identified by MALDI-TOF analysis. This combination of low molar mass and homocoupling drastically reduces device performance, from 7.0 to 2.7%. High molar mass batches sh... |
| Databáze: | OpenAIRE |
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