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Title:: Research Progress on Organic-inorganic Hybrid Photoconductive Cathode Modification Materials

Author(s):: ZHENG Jiaxin; XIE Zengqi; (State Key Laboratory of Luminescent Materials and Devices，South China University of Technology，Guangzhou 510640，China)

Keywords:: photoelectron transfer; conductivity; electrode modification; hybrid; solar cell; light-emitting diode; printed electronics

Abstract:: The cathode interlayers of organic photovoltaic cells (OPVs) and organic lightemitting diodes (OLEDs) are usually made from organic small molecules, polyelectrolytes and solgel processed metal oxides. The film thickness is usually limited under 30 nm due to the poor conductivity of these materials, which causes troubles for largescale production in future. Recently, the novel strategy of organicinorganic hybrid photoconductive interlayer materials by photodoped method was proposed to solve the low conductivity problem of cathode interlayer materials. Conjugated molecules possess high extinction coefficient while inorganic metal oxides typically show high electron mobility, thus, photoinduced electron transfer from organic molecules to metal oxides fulfills the electron traps in metal oxides and greatly enhances the charge carrier (electron) density at the same time, which result in very high photoconductivity. It has been reported that by doping a class of perylene imide photosensitizers into the amorphous zinc oxide film, the electrical conductivity under light irradiation is improved dramatically. Such photoconductive materials were used as cathode interlayers in OPVs and OLEDs, and greatly enhanced device performance was achieved even the film thickness was changed in very large range, which facilitates the large volume production in future.