Primary Photoexcitations and the Origin of the Photocurrent in Rubrene Single Crystals

Details Primary Photoexcitations and the Origin of the Photocurrent in Rubrene Single Crystals Primary Photoexcitations and the Origin of the Photocurrent in Rubrene Single Crystals

2005-10-27

arxiv.org/abs/cond-mat/0510768v1

Phys. Rev. Lett. 96, 056604 (2006)

Physics

Condensed Matter

Other Condensed Matter

4 pages, 3 figures

Scientific paper

10.1103/PhysRevLett.96.056604

By simultaneously measuring the excitation spectra of transient luminescence and transient photoconductivity after picosecond pulsed excitation in rubrene single crystals we show that free excitons are photoexcited starting at photon energies above 2.0 eV. We observe a competition between photoexcitation of free excitons and photoexcitation into vibronic states that subsequently decays into free carriers, while molecular excitons are instead formed predominantly through the free exciton. At photon energies below 2.25 eV, free charge carriers are only created through a long-lived intermediate state with a lifetime of up to 0.1 ms and no free carriers appear during the exciton lifetime.

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