Ohmic contacts to perylene molecular crystals were successfully formed at bromine-doped p-type crystal∕platinum junctions and sodium-doped n-type crystal∕aluminum junctions to enable hole and electron injection, respectively. Charge-carrier doping of the organic semiconductor surface that was in direct contact with the metal electrodes was revealed as being a requirement for fabricating organic∕metal junctions that were ohmic in character. The fabrication of ohmic contacts would be applicable to carrier injection in organic electroluminescent devices and carrier extraction from organic solar cells.
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Hiramoto et al. (2004) studied this question.
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