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Issue 19, 2018
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Conformationally controlled ultrafast intersystem crossing in bithiophene systems

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Abstract

Bithiophenes serve as model systems for larger polythiophenes used in solar cell applications and molecular electronics. We report a study of ultrafast dynamics of two bithiophene systems measured with femtosecond time-resolved photoelectron spectroscopy, and show that their intersystem crossing takes place within the first few picoseconds after excitation, in line with previous studies. We show that the intersystem crossing rate can be explained in terms of arguments based on symmetry of the S1 minimum energy geometry, which depends on the specific conformation of bithiophene. Furthermore, this work shows that the minor cis-conformer contributes to an even higher intersystem crossing rate than the major trans conformer. The work presented here can provide guiding principles towards the design of solar cell components with even faster formation of long-lived excited states for solar energy harvesting.

Graphical abstract: Conformationally controlled ultrafast intersystem crossing in bithiophene systems

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Publication details

The article was received on 04 Mar 2018, accepted on 19 Apr 2018 and first published on 26 Apr 2018


Article type: Paper
DOI: 10.1039/C8CP01419A
Citation: Phys. Chem. Chem. Phys., 2018,20, 13412-13418
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    Conformationally controlled ultrafast intersystem crossing in bithiophene systems

    A. B. Skov, M. A. B. Larsen, M. B. Liisberg, T. Hansen and T. I. Sølling, Phys. Chem. Chem. Phys., 2018, 20, 13412
    DOI: 10.1039/C8CP01419A

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