期刊
FARADAY DISCUSSIONS
卷 185, 期 -, 页码 507-527出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/c5fd00052a
关键词
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资金
- Alexander von Humboldt foundation
- Bavarian State Ministry of Science, Research
- Collaborative Research Network Solar Technologies go Hybrid
- National Research Foundation of Korea (NRF) - Ministry of Education, Science and Technology (MEST) [2005-0093839]
Foldamer systems comprised of two perylene bisimide (PBI) dyes attached to the conjugated backbones of 1,2-bis(phenylethynyl) benzene and phenylethynyl-bis(phenylene) indane, respectively, were synthesized and investigated with regard to their solvent-dependent properties. UV/Vis absorption and steady-state fluorescence spectra show that both foldamers exist predominantly in a folded H-aggregated state consisting of pi-pi-stacked PBIs in THF and in more random conformations with weaker excitonic coupling between the PBIs in chloroform. Time-resolved fluorescence spectroscopy and transient absorption spectroscopy reveal entirely different relaxation pathways for the photoexcited molecules in the given solvents, i.e. photoinduced electron transfer leading to charge separated states for the open conformations (in chloroform) and relaxation into excimer states with red-shifted emission for the stacked conformations (in THF). Supported by redox data from cyclic voltammetry and Rehm-Weller analysis we could relate the processes occurring in these solution-phase model systems to the elementary processes in organic solar cells. Accordingly, only if relaxation pathways such as excimer formation are strictly avoided in molecular semiconductor materials, excitons may diffuse over larger distances to the heterojunction interface and produce photocurrent via the formation of electron/hole pairs by photoinduced electron transfer.
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