Journal Article electrohydrodynamic nanowire lithography graphene Cu electrodes Research Support, Non-U.S. Gov't band gap opening decamethylcobaltocene electrode printing electrohydrodynamically printed nanowires exciton quenching field-effect transistors flexible electrodes graphene nanoribbons large-scale fabrication metal nanofibers nanofiber electrodes nanofiber transistors organic/inorganic hybrid perovskites perovskite light emitting diodes photoluminescence lifetime work function tuning