Photoinduced dynamics of the hole-transport material H101 in organic solvents and on mesoporous Al<subscript>2</subscript>O<subscript>3</subscript> and TiO<subscript>2</subscript> thin films.
In: Physical Chemistry Chemical Physics (PCCP), Jg. 19 (2017-08-28), Heft 32, S. 21748-21758
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Zugriff:
We present a comprehensive steady-state and time-resolved UV-Vis-NIR absorption and fluorescence study of the hole-transport material H101 to characterise its photophysics in different organic solvents and on mesoporous Al 2 O 3 and TiO 2 thin films. Photoexcitation of H101 at 400 nm in organic solvents populates the S 1 state which shows intramolecular relaxation on a picosecond time scale. Branching from the relaxed S 1 state leads to population of the T 1 triplet state and the ground electronic state S 0 . Triplet formation is induced by the internal heavy-atom effect of the sulphur atom, and the triplet yield decreases substantially with solvent polarity. On mesoporous Al 2 O 3 , intermolecular exciton-splitting is observed leading to the formation of a radical cation – radical anion pair (H101(S 1 ) + H101(S 0 ) → H101Ṗ + + H101Ṗ − ) followed by exciton recombination. On mesoporous TiO 2 , efficient electron injection is observed in addition to exciton-splitting. Complementary spectroelectrochemistry experiments enable a full spectral characterisation of the cation species H101Ṗ + and H101 2+ . Extensive DFT/TDDFT calculations successfully assign the spectral features of all experimentally observed species. Implications for the function of H101 in photovoltaic devices are discussed. [ABSTRACT FROM AUTHOR]
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Titel: |
Photoinduced dynamics of the hole-transport material H101 in organic solvents and on mesoporous Al<subscript>2</subscript>O<subscript>3</subscript> and TiO<subscript>2</subscript> thin films.
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Autor/in / Beteiligte Person: | Klein, Johannes R. ; Scholz, Mirko ; Oum, Kawon ; Lenzer, Thomas |
Link: | |
Zeitschrift: | Physical Chemistry Chemical Physics (PCCP), Jg. 19 (2017-08-28), Heft 32, S. 21748-21758 |
Veröffentlichung: | 2017 |
Medientyp: | academicJournal |
ISSN: | 1463-9076 (print) |
DOI: | 10.1039/c7cp01718a |
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