TITLE

Two mechanisms of exciton dissociation in rubrene single crystals

AUTHOR(S)
Najafov, Hikmat; Lyu, Byunggook; Biaggio, Ivan; Podzorov, Vitaly
PUB. DATE
May 2010
SOURCE
Applied Physics Letters;5/3/2010, Vol. 96 Issue 18, p183302
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
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.
ACCESSION #
50309195

 

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