Preparation Of Silver Nanowire Mesh And Its Application In OLED

With the development of flexible optoelectronic devices,traditional metal oxide-based transparent conductive films,such as indium tin oxide,have inherent shortcomings:the preparation process is complex,fragile,high cost and inflexible,which can no longer meet people's demand for flexible wearable devices.Transparent conductive film(TCF)based on nanowires has been favored by scientific researchers at home and abroad due to its excellent photoelectric properties and bendable characteristics.After continuous research by scholars,the performance of TCF(including gold,silver,copper,etc.)based on metal nanowires has been continuously improved,especially for silver nanowires(AgNWs).Studies have shown that AgNWs can be comparable to traditional transparent metal oxides.Thin film resistance and light transmittance.Today's nanowire film forming technology will form randomly arranged nanowire networks.In the process of random arrangement of nanowires,multiple nanowires will overlap each other.While reducing the square resistance,the light transmittance of the film will be greatly reduced,and the roughness of the film will also increase sharply.In,it affects the contact between the nanowire and the functional layer.This article mainly includes the following parts:First,we synthesize AgNWs by the polyol method,using silver nitrate solution to provide silver source,ethylene glycol as reducing agent,and chloride ion provided by ferric chloride as nucleation control agent,polyol Vinylpyrrolidone is used as a surface covering agent.By adjusting the experimental parameters,using SEM,AFM and optical microscope to characterize the growth of AgNWs,the influence of different parameter ratios on the growth of AgNWs was systematically studied.Second,we use the auxiliary stirring method to prepare the double-layer crisscross AgNWs grid.In the ethylene glycol solvent,comparative experiments were carried out by controlling the concentration of AgNWs,the stirring time,and the stirring speed to analyze the influence of different factors on the AgNWs film.Through the pretreatment of the PET substrate,the surface adhesion of AgNWs on the substrate was increased,and the influence of different pretreatment methods on the adhesion and roughness of the substrate was analyzed.Third,we prepared AgNWs/graphene-like MoS₂ composite transparent conductive film on the basis of ordered AgNWs film.Magnetron sputtering is used to coat a layer of MoS₂ on the AgNWs transparent conductive film,which can effectively isolate oxygen in the air and prevent the oxidation of AgNWs and reduce the conductivity.At the same time,sputtering MoS₂ can reduce the surface roughness of the film.By controlling the thickness of the MoS₂ film to achieve the best balance of light transmittance and conductivity of the film.Fourth,in order to improve the work function of the AgNWs/MoS₂ film,we spin-coated a layer of PEDOT:PSS solution on MoS₂ to prepare AgNWs/MoS₂/PEDOT:PSS composite TCF,and use this film as an anode material to prepare flexible Green light OLED device.We tested the photoelectric performance of the prepared device and compared it with the performance of OLED with ITO as the anode.Ordered AgNWs film can effectively reduce the node rate,reduce film roughness,and increase its electrical conductivity and light transmittance.The introduction of MoS₂ and PEDOT:PSS can effectively reduce the surface roughness of the film and improve the work function of the film,which makes it possible to reduce the starting voltage of the device.