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  Diphenylisobenzofuran Bound to Nanocrystalline Metal Oxides: Excimer Formation, Singlet Fission, Electron Injection, and Low Energy Sensitization

Banerjee, T., Hill, S., Hermosilla-Palacios, M., Piercy, B., Haney, J., Casale, B., et al. (2018). Diphenylisobenzofuran Bound to Nanocrystalline Metal Oxides: Excimer Formation, Singlet Fission, Electron Injection, and Low Energy Sensitization. The Journal of Physical Chemistry C, 122(50), 28478-28490.

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Item Permalink: https://hdl.handle.net/21.11116/0000-000E-DB1A-F Version Permalink: https://hdl.handle.net/21.11116/0000-000E-DB1B-E
Genre: Journal Article

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 Creators:
Banerjee, T.1, Author
Hill, S., Author
Hermosilla-Palacios, M., Author
Piercy, B., Author
Haney, J., Author
Casale, B., Author
DePrince, A., Author
Losego, M., Author
Kleiman, V., Author
Hanson, K., Author
Affiliations:
1Max Planck Society, ou_persistent13              

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 Abstract: We report the photophysical properties of the dicarboxylated diphenylisobenzofuran dye (1) bound to nanocrystalline metal oxide surfaces. With increased surface loading of 1, emission from the films is significantly quenched but with a small amount of excimer emission at maximum surface loadings. Long-lived triplets were observed by ns TA spectroscopy that are consistent with singlet fission occurring on mesoporous ZrO2. The evolution of these triplets, however, could not be convincingly resolved by our subnanosecond TA spectroscopy. Dye-sensitized devices composed of 1 on a TiO2|Al2O3 core-shell structure exhibited an unusual decrease, increase, and then decrease in J(sc) with respect to the thickness of Al2O3. In these films the Al2O3 acts as a tunneling barrier to slow electron injection from the singlet excited state such that singlet fission, and electron injection from the triplet state becomes competitive. Proof-of-principle self-assembled bilayer films that exhibit efficient triplet energy transfer from a low energy absorbing dye to 1 is demonstrated as another step toward a SF-based DSSC that can circumvent the Shockley-Queisser limit.

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Language(s): eng - English
 Dates: 2018
 Publication Status: Issued
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Type: Peer
 Identifiers: eDoc: 744817
ISI: 000454566700004
 Degree: -

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Title: The Journal of Physical Chemistry C
Source Genre: Journal
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Publ. Info: WASHINGTON : AMER CHEMICAL SOC
Pages: - Volume / Issue: 122 (50) Sequence Number: - Start / End Page: 28478 - 28490 Identifier: ISSN: 1932-7447