Oxygen incorporation in rubrene single crystals.
Single crystal rubrene is a model organic electronic material showing high carrier mobility and long exciton lifetime. These properties are detrimentally affected when rubrene is exposed to intense light under ambient conditions for prolonged periods of time, possibly due to oxygen up-take. Using photoelectron, scanning probe and ion-based methods, combined with an isotopic oxygen exposure, we present direct evidence of the light-induced reaction of molecular oxygen with single crystal rubrene. Without a significant exposure to light, there is no reaction of oxygen with rubrene for periods of greater than a year; the crystal's surface (and bulk) morphology and chemical composition remain essentially oxygen-free. Grand canonical Monte Carlo computations show no sorbtion of gases into the bulk of rubrene crystal. A mechanism for photo-induced oxygen inclusion is proposed.
Department of Chemistry and Chemical Biology, Rutgers University Piscataway, NJ 08854.
Daniel D T
DD
Mastrogiovanni
Evans Analytical Group, East Windsor, NJ 08520.
Jeff
J
Mayer
Evans Analytical Group, East Windsor, NJ 08520.
Alan S
AS
Wan
Department of Chemical Engineering, Rutgers University Piscataway, NJ 08854.
Aleksey
A
Vishnyakov
Department of Chemical Engineering, Rutgers University Piscataway, NJ 08854.
Alexander V
AV
Neimark
1] Department of Physics, Rutgers University Piscataway, NJ 08854 [2] Institute for Advanced Materials, Devices and Nanotechnology, Rutgers University Piscataway, NJ 08854.
Vitaly
V
Podzorov
1] Department of Physics, Rutgers University Piscataway, NJ 08854 [2] Institute for Advanced Materials, Devices and Nanotechnology, Rutgers University Piscataway, NJ 08854.
Leonard C
LC
Feldman
1] Department of Chemistry and Chemical Biology, Rutgers University Piscataway, NJ 08854 [2] Institute for Advanced Materials, Devices and Nanotechnology, Rutgers University Piscataway, NJ 08854.
Eric
E
Garfunkel