Sökning: WFRF:(Araujo Moyses 1975 ) >
Donor-acceptor poly...
Donor-acceptor polymer complex formation in solution confirmed by spectroscopy and atomic-scale modelling
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- Jalan, Ishita, 1991- (författare)
- Karlstads universitet,Institutionen för ingenjörs- och kemivetenskaper (from 2013),Karlstad University
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- Marchiori, Cleber (författare)
- Karlstads universitet,Institutionen för ingenjörsvetenskap och fysik (from 2013),Karlstad University
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- Wolkeba, Zewdneh Genene, 1983 (författare)
- Chalmers University of Technology, Sweden,Chalmers tekniska högskola
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- Johansson, André (författare)
- Karlstads universitet,Institutionen för ingenjörsvetenskap och fysik (from 2013),Karlstad University
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- Araujo, Moyses, 1975- (författare)
- Karlstads universitet,Institutionen för ingenjörsvetenskap och fysik (from 2013),Karlstad University
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- Wang, Ergang, 1981 (författare)
- Chalmers University of Technology, Sweden,Chalmers tekniska högskola
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- van Stam, Jan, 1958- (författare)
- Karlstads universitet,Institutionen för ingenjörs- och kemivetenskaper (from 2013),Karlstad University
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- Moons, Ellen, professor, 1966- (författare)
- Karlstads universitet,Institutionen för ingenjörsvetenskap och fysik (from 2013),Karlstad University
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(creator_code:org_t)
- Royal Society of Chemistry, 2023
- 2023
- Engelska.
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Ingår i: Journal of Materials Chemistry C. - : Royal Society of Chemistry. - 2050-7526 .- 2050-7534. ; 11:27, s. 9316-9326
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Abstract
Ämnesord
Stäng
- In all-polymer solar cells, high performance is attributed to the fine-grained morphology of the film in the active layer. However, the mechanism by which this fine-grained morphology is achieved remains unknown. Polymeric non-fullerene acceptors have the potential to restrict the self-aggregation, typical of non-fullerene small molecule acceptors. Here we employed a blend of the polymeric acceptor PF5-Y5 and the donor polymer PBDB-T to investigate the balance between molecular interactions in solution. Temperature-dependent absorption spectra show evidence of temperature-induced disaggregation of both donor and acceptor polymers, where the donor polymer disaggregation depends on the solvent polarity. Concentration-dependent fluorescence spectra of blend solutions display blue-shifted acceptor emission upon dilution, similar to that observed in acceptor solutions, and a decreased tendency for charge transfer from donor to acceptor upon dilution. Excitation spectra of dilute blend solutions contain an increased contribution to the long-wavelength acceptor emission, as compared to pure acceptor solutions, from a chromophore that absorbs in a region where the donor does not absorb. These observations can be explained by donor-acceptor complexation in dilute blend solutions, that is stabilized in more polar solvents. Moreover, the near IR-region of the absorption spectrum could be matched with the calculated electronic excitations of donor-acceptor complexes of PBDB-T and PF5-Y5 oligomers. The results corroborate that the interaction between segments of the donor and acceptor polymer chains favours the formation of donor-acceptor charge transfer complexes, stabilized by hybridization of the molecular orbitals, which reduces the electronic energy. The proposed donor-acceptor complex formation competes with the donor and acceptor self-aggregation and is influenced by the solvent environment. These pre-formed donor-acceptor complexes in low-concentration solutions can be expected to have important consequences on the film morphology of all-polymer blends. The results from this joint experimental-theoretical spectroscopy study provide insights that can guide the design of compatible donor and acceptor polymers for future high-performance organic solar cells.
Ämnesord
- NATURVETENSKAP -- Kemi -- Polymerkemi (hsv//swe)
- NATURAL SCIENCES -- Chemical Sciences -- Polymer Chemistry (hsv//eng)
- NATURVETENSKAP -- Kemi -- Teoretisk kemi (hsv//swe)
- NATURAL SCIENCES -- Chemical Sciences -- Theoretical Chemistry (hsv//eng)
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- Kemi
- Chemistry
- Materials Science
- Materialvetenskap
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Jalan, Ishita, 1 ...
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Marchiori, Clebe ...
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Wolkeba, Zewdneh ...
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Johansson, André
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Araujo, Moyses, ...
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Wang, Ergang, 19 ...
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van Stam, Jan, 1 ...
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Moons, Ellen, pr ...
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- Om ämnet
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- NATURVETENSKAP
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NATURVETENSKAP
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och Kemi
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och Polymerkemi
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- NATURVETENSKAP
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NATURVETENSKAP
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och Kemi
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och Teoretisk kemi
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Journal of Mater ...
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Karlstads universitet
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Chalmers tekniska högskola