ABSTRACT
The behavior of metallic contacts on polymeric media can be studied in a uniquely advantaged way by exploiting the special features of injection into molecular solids in which there is no deep trapping. The development of special classes of molecular solids rendered trap free by explicit chemical design enabled the commercial success of large-area organic electrophotographic receptors, which are now a ubiquitous feature of high-speed, highthroughput, digital printers and copiers [1]. These materials, originally developed for imaging photoreceptors, now find wider application, for example, as transport layers in organic light-emitting diodes (OLEDs) [2]. Because the injection efficiency from metals into trap-free molecular films can be uniquely characterized [3], these materials, important in themselves, also constitute a ideal venue for probing the underlying physics and materials engineering issues related to metal-organic interfacial charge transfer [4].
