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Title: | Impact of the donor polymer on recombination via triplet excitons in a fullerene-free organic solar cell | Authors: | VAN LANDEGHEM, Melissa LENAERTS, Ruben KESTERS, Jurgen MAES, Wouter Goovaerts, Etienne |
Issue Date: | 2019 | Publisher: | ROYAL SOC CHEMISTRY | Source: | PHYSICAL CHEMISTRY CHEMICAL PHYSICS, 21 (41) , p. 22999 -23008 | Abstract: | The greater chemical tunability of non-fullerene acceptors enables fine-tuning of the donor-acceptor energy level offsets, a promising strategy towards increasing the open-circuit voltage in organic solar cells. Unfortunately, this approach could open an additional recombination channel for the charge-transfer (CT) state via a lower-lying donor or acceptor triplet level. In this work we investigate such electron and hole back-transfer mechanisms in fullerene-free solar cells incorporating the novel molecular acceptor 2,4-diCN-Ph-DTTzTz. The transition to the low-driving force regime is studied by comparing blends with well-established donor polymers P3HT and MDMO-PPV, which allows for variation of the energetic offsets at the donor-acceptor interface. Combining various optical spectroscopic techniques, the CT process and subsequent triplet formation are systematically investigated. Although both back-transfer mechanisms are found to be energetically feasible in both blends, markedly different triplet-mediated recombination processes are observed for the two systems. The kinetic suppression of electron back-transfer in the blend with P3HT suggests that energy losses due to triplet formation on the polymer can be avoided, regardless of favorable energetic alignment. | Notes: | Goovaerts, E (reprint author), Univ Antwerp, Phys Dept, Univ Pl 1, B-2610 Antwerp, Belgium. etienne.goovaerts@uantwerpen.be |
Document URI: | http://hdl.handle.net/1942/30403 | ISSN: | 1463-9076 | e-ISSN: | 1463-9084 | DOI: | 10.1039/c9cp03793d | ISI #: | WOS:000492992600030 | Category: | A1 | Type: | Journal Contribution | Validations: | ecoom 2020 |
Appears in Collections: | Research publications |
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c9cp03793d.pdf Restricted Access | Published version | 3.4 MB | Adobe PDF | View/Open Request a copy |
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