Regensburg 2016 – scientific programme
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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 37: Organic-Inorganic Systems II: Energy Level Alignment (organized by O)
CPP 37.7: Talk
Wednesday, March 9, 2016, 12:15–12:30, S054
Photoemission study of thin films of the singlet fission compound 1,3-Diphenylisobenzofuran — •David Nobis, Janek Rieger, Daniel Niesner, Pedro B. Coto, Michael Thoss, and Thomas Fauster — Universität Erlangen-Nürnberg, Staudtstr. 7, D-91058 Erlangen, Germany
Singlet fission (SF) is the conversion of an optically excited, high-energy singlet exciton, into two optically dark, long-lived electronic excited triplet states via a spin-allowed process. This process might be used in next generation solar cells to harvest high-energy light. 1,3-Diphenylisobenzofuran (DPIBF) is a prototypical SF molecule, as has been shown by calculations and optical spectroscopy [1,2].
We investigated thin films of DPIBF on SiO2 with UV photoelectron spectroscopy (UPS) and two-photon photoemission (2PPE). The UPS results show the HOMO located 6 eV below the vacuum level, in good agreement with DFT calculations.
The 2PPE spectra show the first singlet state S1 at 2.8 eV above the HOMO. The triplet state is 1.4 eV lower in energy. Its high, long-lived population is explained by SF in agreement with literature [2].
[1] Schwerin A. F. et al., J. Phys. Chem. A 114 (2010) 1457
[2] Johnson J. C. et al., Phys. Rev. B 132 (2009) 16302