Preparation And Properties Of Copper-based Flexible Transparent Electrode

Transparent electrodes are a key component of optoelectronic devices,which are widely used in information display,solid lighting,photoelectric conversion and other fields.In recent years,various structural transparent electrodes prepared on the basis of copper have attracted wide attention of researchers and industry due to their good characteristics and low cost.In this paper,transparent electrodes with high conductivity,high transmittance and excellent stability are prepared by constructing different types of copper-based transparent electrode structures.The main contents and conclusions are as follows:(1)In order to further improve the optical and electrical properties of the flexible copper-based aluminum-doped ZnO(AZO)composite transparent electrode,a thin layer of graphene is used as a"fence"between the AZO and the copper layer,effectively preventing copper from oxygen in order to avoid oxidation during the preparation process.The electrical conductivity of graphene is further optimized by the electrical transmission of graphene,and the comprehensive enhancement of the photoelectric properties of the composite thin film electrode is finally achieved.The prepared flexible copper-based aluminum-doped ZnO(AZO)composite transparent electrode has excellent performance(quality factor is 3.38×10^-2?^-1,commutation quality factor is 430):the sheet resistance is 4.37?/sq,and the average transmission is higher than 82%.(2)A copper nanowire(Cu NWs)transparent electrode was fabricated on a flexible polyethylene terephthalate(PET)substrate.The electroplating technique between Cu NWs was studied and the Cu NWs was soldered effectively by controlling the plating voltage and time which significantly improved its optical,electrical,adhesion and stability properties.After soldering,the sheet resistance of the flexible Cu NWs film decreased from?200 to?30?/sq.,and the transmittance(83%@550 nm)remained essentially unchanged.At the same time,the sheet resistance did not show a significant change after the bending and adhesion test,indicating that the welded Cu NWs film had good adhesion to the PET substrate.In addition,the flexible Cu NWs film electrode after soldering exhibits good stability and can be stored at room temperature for a long time.At the same time,it has high stability at high temperature(150°C).(3)In order to further optimize the performance of the flexible transparent electrode,a Cu micro-network transparent electrode with ultra-high conductivity,thermal stability and adsorption was prepared on a flexible PET substrate by a combination of template-method and electroplating.The transparent electrode has a quality factor of up to 1187.At this time,the sheet resistance is?2.0?/sq.,and the transmittance is?86%@550 nm,which has both superabsorbent properties and good chemical stability.The human wearable experimental study was carried out,and the results show that the copper micro-mesh transparent electrode has good durability and flexibility while maintaining excellent performance.