Journal
APPLIED PHYSICS LETTERS
Volume 96, Issue 18, Pages -Publisher
AMER INST PHYSICS
DOI: 10.1063/1.3421539
Keywords
dissociation; excitons; organic compounds; photoexcitation
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Funding
- American Chemical Society Petroleum Research Fund [45741-AC10]
- NSF [DMR-0843985, ECS-0822036]
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Excitons in rubrene single crystals dissociate into free charge carriers via two mechanisms whose relative importance depends on the illumination wavelength through the optical penetration depth into the crystal. The first mechanism is defect-induced dissociation in less than 10 ns after photoexcitation. For low photoexcitation densities, about 10% of the excitons that survive radiative recombination dissociate through this channel. The second mechanism, affecting the remaining 90% of the excitons, involves a previously reported state localized close to the surface of the crystal that leads to a delayed release of photocarriers a fraction of a millisecond after photoexcitation. (C) 2010 American Institute of Physics. [doi: 10.1063/1.3421539]
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