at Google ScholarTitle data
Karolewski, Andreas ; Neubig, Anne ; Thelakkat, Mukundan ; Kümmel, Stephan:
Optical absorption in donor–acceptor polymers : alternating vs. random.
In: Physical Chemistry Chemical Physics.
Vol. 15
(2013)
Issue 46
.
- pp. 20016-20025.
ISSN 1463-9084
DOI: https://doi.org/10.1039/C3CP52739E
Project information
| Project title: |
Project's official title Project's id solar technologies go hybrid No information |
|---|---|
| Project financing: |
Deutsche Forschungsgemeinschaft Bayerisches Staatsministerium für Wissenschaft, Forschung und Kunst |
Abstract in another language
We investigate in a combined theoretical and experimental study the influence that the specific arrangement, e.g., alternating or random, of donor and acceptor units has on the optical absorption of extended molecules. Because of its important role in low gap polymers we discuss in particular the energetic position of the first electronic transition. We theoretically determine the excitations in extended oligomers with thiophene as the donor and 2,1,3-benzothiadiazole as the acceptor component by using time-dependent density functional theory based on non-empirically tuned range separated hybrid functionals. Corresponding systems are synthesized and theoretical and experimental data are critically compared to each other. We conclude that the influence of the specific arrangement of donor and acceptor monomers on the optical gap is limited and that effects beyond the single molecule level effectively limit the size of the experimentally observed optical gap.