Journal
APPLIED PHYSICS LETTERS
Volume 87, Issue 5, Pages -Publisher
AMER INST PHYSICS
DOI: 10.1063/1.2001130
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We report the effect of air exposure on the electronic properties of pentacene single crystals. Air can diffuse reversibly in and out of the crystals and influences the physical properties. We discern two competing mechanisms that modulate the electronic transport. The presence of oxygen increases the hole conduction, as in dark four O-2 molecules introduce one charge carrier. This effect is enhanced by the presence of visible light. Contrarily, water, present in ambient air, is incorporated in the crystal lattice and forms trapping sites for injected charges. (c) 2005 American Institute of Physics.
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