N-ZnO nanorod arrays/p-GaN light-emitting diodes with graphene transparent electrode

Few-layer graphene sheets are applied as transparent electrode and current spreading layer for n-ZnO nanorod arrays/p-GaN light-emitting diodes (LEDs). The device with graphene electrode exhibits improved electro-luminescence (EL) performance in EL intensity and reliability compared to the n-ZnO nanorod arrays/p-GaN LED with conventional indium-fin-oxide (ITO) electrode. The results prove that, with its superior electrical, optical and thermal properties, graphene can be an ideal candidate for transparent electrodes in nanorod arrays-based LEDs.