| Transparent electrode is an indispensable and important component in the modern electronics manufacturing industry.It is used in all kinds of electronic devices,covering a wide rang e of display panels,solar cells,light-emitting diodes and various types of sensors.At present,indium tin oxide(ITO)is the most widely used material for traditional transparent electrode.However,It is not suitable for flexible and printed electronics.As it has properties of brittleness,high-cost fabrication process,and indium scarcity.Therefore,it is of vital importance to develop other excellent electrode materials to replace ITO.The transparent electrode of silver nanowire network exhibits excellent conductivity and light transmission,which overcomes the shortcomings of the traditional ITO transparent electrode.However,the outstanding performance of silver nanowires transparent electrode usually degrades as it has poor long-term reliability.It has become the bottleneck in the promotion of its application,which is necessary to be resolved.In this study,the optimal parameters for the preparation of silver nanowires have been explored.The degradation mechanism of silver nanowire transparent electrode has been studied by using silver nanowires under high temperature,high humidity and light illumination.The PEDOT: PSS aqueous solution has been used as the protective layer for improving reliability.The protective effect of PEDOT: PSS aqueous solution protective layer has been also studied.The high-performance silver nanowire has been prepared.The effects of different pretreatment temperature of EG,reaction temperature,reaction time and Cu Cl2 concentration on the preparation of silver nanowires have been determined by polyol method.The preparation parameters of silver nanowires have been optimized.Formation mechanism of silver nanowires with high aspect ratio has been also studied.The silver nanowire ink with better performance after thin ning of PVP layer was obtained by pre-treatment with ethanol.The silver nanowire electrode has been prepared by spin-coating method.And the high conductivity and high light transmittance of the electrode has been realized by adjusting the rotational speed and the number of layers.When the transmittance of the resulting electrode is more than 80%,the surface resistance was 90.47Ω/sq.The effects of accelerating test on the surface microstructures,resistance and transmittance of silver nanowire electrode has been investigated in the experiment.Under the experiment condition of temperature of 80℃ and the relative humidity of 100%,a large number of nano-particles on the silver nanowires emerged in silver nanowire network,which increase the contact area of the silver nanowires junction to enhance the conductivity.Then continue to deteriorate the silver nanowires,there is silver nanowires fracture due t o Rayleigh instability of silver nanowires.Therefore the surface resistance of transparent electrode in creased.The surface resistance of the electrode surface decreases first and then increases under the irradiation of the light irradiation.And the surface resistance of the silver nanowire is reduced because silver nanowires have been locally connected.In order to improve the conductivity and degradation reliability of silver nanowire electrode,the protective layer of the PEDOT:PSS aqueous solution has been designed.The silver nanowire electrode with spin-coated layer was designed and fabricated.The conductivity of electrode has been greatly improved as the surface resistance decreased from the original 96.52Ω/sq down to 9.73Ω/sq;After 300 h,the normalized surface resistance is stable with re spect to the electrode without the PEDOT:PSS aqueous solution protective layer.The surface roughness of the electrode decreased from 35.5nm to 23.8nm.Besides,the adhesion force between the silver nanowires and the substrate was strengthened.The PEDOT:PSS aqueous solution of the conductive polymer could improve the long-term use reliability of the silver nanowire transparent electrode. |
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