The Study Of The Flexible Transparent Electrode Applied To Organic Optoelectronic Devices

Transparent conductive electrodes(TCEs)play an important role in the fabrication and development of organic optoelectronic devices,such as organic light emitting diodes(OLEDs)?Organic Photovoltaic Cells(OPVCs).The added attribute of flexibility creates the prospect of producing wearable electronic devices.High optical transmittance and low resistivity,however,are the key properties of TCEs.Indium Tin Oxide(ITO)is now the most widely used transparent conductive electrode,but due to the shortage of Indium materials as well as the high cost of ITO electrode preparation,now more and more researchers set out to find a suitable ITO alternative materials.Silver nanowires(AgNW)are often considered as the most promising materials to replace ITO in flexible optoelectronic devices because of their excellent electrical,optical,and mechanical properties.Networks of AgNW have been shown to facilitate high transparency,high conductivity,and good mechanical stability.However,the loose characteristic and local insulation problems due to gaps between the nanowires limit their application as electrodes.This paper afford a significantly improved network of AgNW may enable TCEs with metallic grid structures that retain a high conductivity while permitting near 100% optical transmission through “holes” in the grid.This study investigates an inkjet-printed Ag grid combined with AgNW to form a transparent hybrid electrode.The printed Ag grid on AgNW film connects the gaps between the Ag nanowires to increase the overall electric conductivity and it can also connect the loose Ag nanowires,reinforce its connectivity,and increase its mechanical stability.This allows the AgNW to be peeled off the silicon wafer completely and to produce a hybrid electrode with an ultra-smooth surface.The printed Ag-grid/AgNW hybrid electrodes have low resistivity(22.5?/?,)while maintaining a high transmittance(87.5%).These values compared with only AgNW electrode 45.7?/? has been greatly improved and also are similar to ITO on glass which has resistivity of 20?/?,and transmittance of 89% at 550 nm.In addition,these hybrid electrodes are also very flexible when fabricated on a photopolymer substrate.A spin-coating process combined with a peel-off process enable the fabrication of flexible ultra-smooth Ag-grid/AgNW electrodes.We tested the transparent and flexible electrode as the anode of a flexible organic light emitting diode(F-OLED).The maximum brightness and current efficiency of the F-OLED are 10000 cd/m2 and 12 cd/A,respectively,even when bent around a radius of 2 mm.The good performance of the device with Ag-grid/AgNW hybrid electrodes show that enhanced conductive inkjet-printed Ag nanoparticles combined with Ag nanowires can produce high quality electrodes for flexible organic optoelectronic devices.