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Photobleaching dynamics in small molecule vs. polymer organic photovoltaic blends with 1,7-bis-trifluoromethylfullerene
| Content Provider | United States Department of Energy Office of Scientific and Technical Information (OSTI.GOV) |
|---|---|
| Author | Garner, Logan E. Nellissery Viswanathan, Vinila Arias, Dylan H. Brook, Colin P. Ferguson, Andrew J. Kopidakis, Nikos Larson, Bryon W. Owczarczyk, Zbyslaw R. Pfeilsticker, Jason R. Ramamurthy, Praveen C. Boltalina, Olga V. Braunecker, Wade A. |
| Organization | National Renewable Energy Lab. (NREL), Golden, CO (United States) |
| Abstract | Two organic photovoltaic (OPV) donor materials (one polymer and one small molecule) are synthesized from the same constituent building blocks, namely thiophene units, cyclopentathiophene dione (CTD), and cyclopentadithiophene (CPDT). Photobleaching dynamics of these donor materials are then studied under white light illumination in air with blends of PC70BM and the bistrifluoromethylfullerene 1,7-C60(CF3)2. For both the polymer and small molecule blends, C60(CF3)2 stabilizes the initial rate of photobleaching by a factor of 15 relative to PC70BM. However, once the small molecule:C60(CF3)2 blend bleaches to ~80% of its initial optical density, the rate of photobleaching dramatically accelerates, which is not observed in the analagous polymer blend. We probe that phenomenon using time-resovled photoluminescence (TRPL) to measure PL quenching efficiencies at defined intervals during the photobleaching experiments. The data indicates the small molecule donor and C60(CF3)2 acceptor significantly de-mix with time, after which the blend begins to bleach at approximately the same rate as the neat donor sample. The work suggests that perfluoroalkylfullerenes have great potential to stabilize certain OPV active layers toward photodegradation, provided their morphology is stable. |
| Sponsorship | USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22) USDOE Office of Energy Efficiency and Renewable Energy (EERE), Solar Energy Technologies Office (EE-4S) |
| Related Links | https://www.osti.gov/biblio/1424579 |
| Starting Page | 4623 |
| Ending Page | 4628 |
| Page Count | 6 |
| File Format | |
| ISSN | 20507488 |
| DOI | 10.1039/C7TA10995D |
| Journal | Journal of Materials Chemistry. A |
| Volume Number | 6 |
| Issue Number | 11 |
| Language | English |
| Publisher | Royal Society of Chemistry |
| Publisher Date | 2018-02-27 |
| Publisher Place | United States |
| Access Restriction | Open |
| Subject Keyword | SOLAR ENERGY MATERIALS SCIENCE organic photovoltaics donor materials OPV |
| Content Type | Text |
| Resource Type | Article |
| Subject | Chemistry Renewable Energy, Sustainability and the Environment Materials Science |
