Effect of Palladium-Tetrakis(Triphenylphosphine) Catalyst Traces on Charge Recombination and Extraction in Non-Fullerene-based Organic Solar Cells
Schopp N. Brus V.V. Lee J. Dixon A. Karki A. Liu T. Peng Z. Graham K.R. Ade H. Bazan G.C. Nguyen T.-Q.
April 8, 2021John Wiley and Sons Inc
Advanced Functional Materials
2021#31Issue 15
The effect of the cross-coupling catalyst tetrakis(triphenylphosphine)palladium(0) (Pd(PPh3)4) on the performance of a model organic bulk-heterojunction solar cell composed of a blend of poly([2,6′-4,8-di(5-ethylhexylthienyl)benzo[1,2-b;3,3-b]dithiophene]{3-fluoro-2[(2-ethylhexyl)carbonyl]thieno[3,4-b]thiophenediyl}) (PTB7-Th) donor and 3,9-bis(2-methylene-((3-(1,1-dicyanomethylene)-6,7-difluoro)-indanone))-5,5,11,11-tetrakis(4-hexylphenyl)-dithieno[2,3-d:2′,3′-d′]-s-indaceno[1,2-b:5,6-b′]dithiophene (IOTIC-4F) non-fullerene acceptor is investigated. The effect of intentional addition of different amounts of Pd(PPh3)4 on morphology, free charge carrier generation, non-geminate bulk trap- and surface trap-assisted recombination as well as bimolecular recombination and charge extraction is quantified. This work shows that free charge carrier generation is affected significantly, while the impact of Pd(PPh3)4 on non-geminate recombination processes is limited because the catalyst does not facilitate efficient trap-assisted recombination. The studied system shows substantial robustness towards the addition of Pd(PPh3)4 in small amounts.
catalyst traces , extraction , impurities , organic solar cells , recombination dynamics
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Center for Polymers and Organic Solids, Department of Chemistry and Biochemistry, University of California Santa Barbara (UCSB), Santa Barbara, 93106, CA, United States
Department of Physics, School of Sciences and Humanities, Nazarbayev University, Nur-Sultan, 010000, Kazakhstan
Department of Chemical Engineering and Applied Chemistry, Chungnam National University, Daejeon, 34134, South Korea
Department of Chemistry, University of Kentucky, 505 Rose St., Lexington, 40506-0055, KY, United States
Department of Physics, Organic and Carbon Electronics Laboratories (ORaCEL), NC State University, Raleigh, 27695-8202, NC, United States
Center for Polymers and Organic Solids
Department of Physics
Department of Chemical Engineering and Applied Chemistry
Department of Chemistry
Department of Physics
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