Effect of Gases on the Conductivity of Organic Solids. IV. Site of Carrier Injection

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Abstract
-Evidence suggesting the involvement of the electrode-crystal interface in ambient vapor induced charge carrier injection phenomena in organic crystals is presented. Space-charge-limited currents are not observed until high voltages are applied when superlinear current-voltage character-istics indicating such effects are also found in the unexposed crystal. Drift mobility measurements on anthracene crystals exposed to iodine vapor confirm that the ambient vapor induced bulk conductivity effects are phenomena in volving the production of charge carriers.