Preparation And Properties Of Silver Nanowire/PEDOT:PSS Composite Transparent Electrode

With the development of electronic equipment,the traditional rigid electronic products integrated on a silicon substrate can no longer meet the needs of people.In recent years,the flexibility of electronic devices has become the development trend of the next generation of electronic devices.Flexible electronics have a broad application prospect in information,energy,medical,national defense and other fields because of their unique flexibility and ductility,efficient and low-cost manufacturing process.Flexible electrodes are the basis of flexible electronics,and flexible electrodes are also one of the key factors restricting the development of flexible electrons.Indium tin oxide（ITO）is a representative transparent electrode,which is widely used in various devices and has excellent conductivity and stability.However,poor mechanical properties and a lack of indium limit the application of ITO.Therefore,it is urgent to develop flexible transparent electrodes with high conductivity.AgNWs electrode has excellent conductivity and high visible light transmittance.However,its adhesion and flexibility need to be improved,and it needs to be compounded with other two-dimensional materials（Poly（3,4-ethylenedioxythiophene）:Polystyrene sulfonate（PEDOT:PSS））to improve its flexibility and adhesion on the substrate.In this paper,high conductivity flexible transparent electrode was prepared by ultrafast laser treatment of AgNWs/PEDOT:PSS composite electrode.AgNWs/PEDOT:PSS laser treatment composite electrode combines the advantages of metal and polymer.It not only has good flexibility and easy machinability but also has excellent electrical conductivity and visible light transmittance.The main contents and conclusions of this thesis are as follows:（1）By adjusting the spraying process and conditions,and AgNWs electrode with a quality factor（FOM）of 161 was prepared on a polydimethylsiloxane（PDMS）substrate.The 550 nm wavelength transmission of the film was 85.1%,and the sheet resistance of the film was 13.9Ωsq^-1.The mechanical properties were tested.When the bending radius was 10 mm and the bending time was 1000,the sheet resistance of the PDMS/AgNWs electrode increased by 49%.（2）Ultrafast laser was used to process PEDOT:PSS thin films,and the power,scanning speed and filling spacing of laser processing were studied.The conductivity of PEDOT:PSS is increased by 3 orders of magnitude,reaching 1226 S cm^-1,the transmittance is as high as 89.2%（550 nm）,and the FOM is 47.1.Three different laser treatment powers of low power（6 W）,medium power（7 W）and high power（8W）were selected to explore the mechanism of laser treatment to improve the electrical conductivity of thin films.It is found that the ultrafast laser acting on the surface of PEDOT:PSS thin films can improve the oxidation degree of PEDOT on the one hand,which leads to the increase of carrier concentration.On the other hand,it can reduce the surface PSS content and increase carrier mobility.The joint action of these two factors leads to an increase in electrical conductivity.（3）The AgNWs/PEDOT:PSS electrode processed by ultrafast laser was prepared on PDMS substrate.The square resistance of the composite electrode is 24.1Ωsq^-1(When uncompounded,the square resistance of the AgNWs electrode is 25.2Ωsq^-1),and the transmittance is 81.5%when the wavelength is 550 nm.The adhesion of laser-treated composite electrodes on PDMS is much higher than that of AgNWs.After 100 times of 3 M tape peeling test,the electrical properties are unchanged.The flexibility of laser-treated composite electrodes is much higher than that of simple AgNWs electrodes.When the bending radius of 10mm is 10000 times,the increase rate of square resistance is only 12%.When the bending radius is 4 mm,the resistance increase rate is 30%,and after 100 times of testing,the corresponding resistance value under different bending radius the same as the first time.Under the elongation of 30%,the square resistance increase rate is only 70%,and after 100 tests,the corresponding resistance values under different elongations are the same as the first time.