Impedance spectroscopy study of electronic transport properties in organic devices

Abstract

Organic devices have been successfully applied to OLED TVs, while development for new applications as flexible devices is still progressing. Understanding the electronic transport properties of organic devices is fundamentally important for device-operation analysis and device design. Impedance spectroscopy is a non-destructive method and hence the transport properties of organic devices under operation can be studied. It is shown here that impedance spectroscopy can probe electron and hole mobilities, tail state distributions from the band edges, and bimolecular recombination constants of double-injection devices such as polymer light-emitting diodes. It is also shown that the dielectric properties of the gate insulator, the field effect mobility, and the interfacial localized states can be determined in organic transistors.