Control of Intrachain Charge Transfer in Model Systems for Block Copolymer Photovoltaic Materials

Title data

Johnson, Kerr ; Huang, Ya-Shih ; Hüttner, Sven ; Sommer, Michael ; Brinkmann, Martin ; Mulherin, Rhiannon C. ; Niedzialek, Dorota ; Beljonne, David ; Clark, Jenny ; Huck, Wilhelm T. S. ; Friend, Richard H.:
Control of Intrachain Charge Transfer in Model Systems for Block Copolymer Photovoltaic Materials.
In: Journal of the American Chemical Society. Vol. 135 (2013) Issue 13 . - pp. 5074-5083.
ISSN 1520-5126
DOI: https://doi.org/10.1021/ja3121247

Official URL:

Abstract in another language

We report the electronic properties of the conjugated coupling between a donor polymer and an acceptor segment serving as a model for the coupling in conjugated donor–acceptor block copolymers. These structures allow the study of possible intrachain photoinduced charge separation, in contrast to the interchain separation achieved in conventional donor–acceptor blends. Depending on the nature of the conjugated linkage, we observe varying degrees of modification of the excited states, including the formation of intrachain charge transfer excitons. The polymers comprise a block (typically 18 repeat units) of P3HT, poly(3-hexyl thiophene), coupled to a single unit of F8-TBT (where F8 is dioctylfluorene, and TBT is thiophene-benzothiadiazole-thiophene). When the P3HT chain is linked to the TBT unit, we observe formation of a localized charge transfer state, with red-shifted absorption and emission. Independent of the excitation energy, this state is formed very rapidly (<40 fs) and efficiently. Because there is only a single TBT unit present, there is little scope for long-range charge separation and it is relatively short-lived, <1 ns. In contrast, when the P3HT chain and TBT unit are separated by the wider bandgap F8 unit, there is little indication for modification of either ground or excited electronic states, and longer-lived charge separated states are observed.

Further data

Item Type:	Article in a journal
Refereed:	Yes
Institutions of the University:	Faculties > Faculty of Biology, Chemistry and Earth Sciences > Department of Chemistry > Former Professors > Junior Professor Solar Energy - Juniorprof. Dr. Sven Hüttner Profile Fields > Advanced Fields > Polymer and Colloid Science Faculties Faculties > Faculty of Biology, Chemistry and Earth Sciences Faculties > Faculty of Biology, Chemistry and Earth Sciences > Department of Chemistry Faculties > Faculty of Biology, Chemistry and Earth Sciences > Department of Chemistry > Junior Professor Solar Energy Profile Fields Profile Fields > Advanced Fields Faculties > Faculty of Biology, Chemistry and Earth Sciences > Department of Chemistry > Former Professors
Result of work at the UBT:	No
DDC Subjects:	500 Science > 530 Physics 500 Science > 540 Chemistry
Date Deposited:	12 Jan 2018 10:38
Last Modified:	12 Feb 2019 09:49
URI:	https://eref.uni-bayreuth.de/id/eprint/41717