Investigation into aggregation types in a benzodithiophene-isoindigo copolymer

The type of aggregation in conjugated polymers determines their use in electronic devices. H-type aggregates are most suitable for solar cell applications, while J-type aggregates are recommended for light-emitting diodes. In this work, we used three methods to determine the type of aggregates in a...

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Published inThe Journal of chemical physics Vol. 159; no. 3
Main Authors Asmare, Eninges, Hone, Fekadu Gashaw, Mammo, Wendimagegn, Krüger, Tjaart P J, Tegegne, Newayemedhin A
Format Journal Article
LanguageEnglish
Published United States 21.07.2023
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Summary:The type of aggregation in conjugated polymers determines their use in electronic devices. H-type aggregates are most suitable for solar cell applications, while J-type aggregates are recommended for light-emitting diodes. In this work, we used three methods to determine the type of aggregates in a benzodithiophene-isoindigo-based (PBDTI-DT) copolymer, namely, Huang-Rhys factor evolution with temperature, Franck-Condon analysis, and relative quantum yield (QY) calculation. All three methods indicate that both aggregation types are present, and the QY calculation clearly indicates that H-aggregates are more dominant. Time-dependent density functional theory was used to identify the two absorption bands of PBDTI-DT as local π - π* and intramolecular charge-transfer transitions.
ISSN:1089-7690
DOI:10.1063/5.0151318