Electrical Properties of Pure and Mixed Evaporated Dye Layers

Abstract

The electrical properties of the pure, mixed and successively evaporated dye pigments copper phthalocyanine and indanthreneyellow GK are investigated by dark and photoconductivity measurements and compared with their electrophotographic sensitivity by arrangement as photogeneration layer in a dual layer photoreceptor configuration. The results reveal an advantageous photoelectrical behaviour of mixed layers compared with the corresponding single and double dye layers due to an effective charge separation as a result of the photoinduced charge transfer between the mixed dyes. The electrophotographic behaviour shows a smaller variation because the sensitivity is largely influenced by an effective hole injection from the charge generation dye layer to the transparent charge transport layer.

Specific optical and electrical properties of Vacuum-Deposited Thin Films of Dyes

“…. 10 ~ l 2 S/cm [69,70]. The activation energy of 6D is in a range of 2 eV which corresponds (more fortuitously) with the gap energy.…”

“…Also the molecular approach in scheme 5 c shows that many analogies exist to p/n-heterojunctions in relation to an effective charge separation. An example for the consequence of the light-induced charge transfer is the tenfold increase of photoconductivity of mixed evaporated CuPdindanthrene yellow GK (Y 4) layers compared with the corresponding double layers [70]. Due to the redox potentials CuPc acts as electron donor and Y 4 as acceptor.…”