Photoemisssion from Metal Contacts into Anthracene Crystals: A Critical Review

Photocurrents in anthracene crystals which have metallic contacts are discussed and it is shown that in some cases these currents can be interpreted as arising from photoemission from the metallic contact into the anthracene crytal. The experimental evidence is reviewed to ascertain which measurements can be interpreted in this way. The conclusions that can be drawn from these measurements concerning the nature of metallic contacts on anthracene crystals and the nature of the conduction states in the anthracene is examined.