Singlet-Fission Sensitizers for Ultra-High Efficiency Excitonic Solar Cells: 15 August 2005 - 14 October 2008

Michl, Josef

doi:10.2172/945956

Cited by 1 publication

(1 citation statement)

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“…For the fully loaded ZrO 2 - 1 films, the long-lived nature of the excited species as well as the similarity to the sensitized spectrum indicates that the triplet excited state of 1 is being generated at the nonsensitized interface. Since the intersystem crossing yield (Φ ISC ) is very low for organic molecules like DPIBF , the appearance of the triplet absorption feature is consistent with SF occurring in ZrO 2 - 1 .…”

Section: Results and Discussionsupporting

confidence: 90%

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

et al. 2018

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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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Section: Results and Discussionsupporting

confidence: 90%