Collecting up to 115% of Singlet-Fission Products by Single-Walled Carbon Nanotubes
- 16 June 2020
- journal article
- research article
- Published by American Chemical Society (ACS) in ACS Nano
- Vol. 14 (7), 8875-8886
- https://doi.org/10.1021/acsnano.0c03668
Abstract
In this contribution, we focused on integrating a phenylene-bridged dibenzodiazahexacene dimer (o-DAD), which is singlet fission (SF) active, onto single-walled carbon nanotubes (SWCNTs) as a low-energy sink for energetically low lying excited states that stem from SF. Spectroscopic and microscopic assays assisted in documenting that SWCNT/o-DAD feature high stability in THF as a result of electronic interactions between the individual constituents. For example, statistical Raman analysis underlined n-doping of SWCNTs in the presence of o-DAD. Fluorescence spectroscopy prompted an energy transfer between the individual constituents, a conclusion that was exclusively derived from the quenching of the o-DAD-centered fluorescence. Excitation spectroscopy with a focus on the SWCNT fluorescence confirmed independently this conclusion by showing o-DAD-centered features. Our work was rounded off by time-resolved transient absorption measurements with SWCNT/o-DAD, in which evidence was gathered for the sequential o-DAD-centered SF with an efficiency of 112% followed by a unidirectional energy transfer from o-DAD to SWCNT and a rapid deactivation. The energy transfer efficiency from SF products such as (S1S0)CT and 1(T1T1) exceeded the 100% threshold with values of 115%, which is conventionally found in energy transfer schemes.Funding Information
- Deutsche Forschungsgemeinschaft (SFB 953)
- Friedrich-Alexander-Universit?t Erlangen-N?rnberg
- Bavarian State Government
- Cluster of Excellence Engineering of Advanced Materials
This publication has 82 references indexed in Scilit:
- External Quantum Efficiency Above 100% in a Singlet-Exciton-Fission–Based Organic Photovoltaic CellScience, 2013
- Harnessing Sun’s Energy with Quantum Dots Based Next Generation Solar CellNanomaterials, 2012
- Triplet Exciton Dissociation in Singlet Exciton Fission PhotovoltaicsAdvanced Materials, 2012
- Singlet Exciton Fission in Nanostructured Organic Solar CellsNano Letters, 2011
- Carbon nanostructures for solar energy conversion schemesChemical Communications, 2011
- Alkynylated Aceno[2,1,3]thiadiazolesOrganic Letters, 2009
- Raman spectroscopy of strained single-walled carbon nanotubesChemical Communications, 2009
- Antenna effects and improved efficiency in multiple heterojunction photovoltaic cells based on pentacene, zinc phthalocyanine, and C60Journal of Applied Physics, 2009
- Ultrafast singlet and triplet dynamics in microcrystalline pentacene filmsPhysical Review B, 2009
- 6,13‐Diethynyl‐5,7,12,14‐tetraazapentaceneChemistry – A European Journal, 2009