Preparation Of Bio-inspired Ag Network Structure Flexible Transparent Conductive Electrode And Its Property Research

Aiming at the problems of poor flexibility,large sheet resistance,poor mechanical properties,toxic components and scarcity of raw materials leads to rising costs in the mainstream transparent conductive electrode indium tin oxide(ITO)on the current market.In this paper,the unique micro-features of plant leaf veins and roots were applied to the silver network transparent conductive electrode,and a flexible transparent conductive electrode with excellent photoelectric and mechanical properties was prepared.The specific research work in this paper mainly includes the following aspects:(1)Firstly,the research progress of transparent conductive electrodes of various materials is systematically introduced and corresponding optoelectronic properties,preparation methods,advantages and disadvantages.And introduced the current research status and progress of transparent conductive electrodes in metal networks.Also introduced the research status and performance of transparent conductive metal networks with various natural bionic structures.Finally,the performance indicators and evaluation methods for evaluating transparent conductive electrodes are introduced.(2)A flexible and transparent conductive electrode with excellent photoelectric properties of the leaf vein bionic composite Ag network structure was prepared.The electrode realizes the further filling of the leaf vein mesh,optimizes the circuit transmission path in the leaf vein structure,reduces the average line width(4.32 ?m)and line spacing(30.56 ?m),and has excellent comprehensive photoelectric performance(transmittance is about 75%,sheet resistance is about 0.3 ?/sq).Based on this electrode,an electrochromic device with a maximum discoloration range of 66.76% was prepared.(3)Aiming at the problem that the current line width and spacing of the metal Ag network flexible transparent conductive electrodes are reduced,the sheet resistance will increase,and the low line width and low line spacing are beneficial to the metal network electrode's charge transport and extraction in photovoltaic devices.In this paper,the spin coating method and the blade coating method are combined to prepare a small line width(average line width of about 1 ?m),small line spacing(average line spacing of about 20 ?m),and small square resistance(3-5 ?/sq)a flexible transparent conductive electrode with a leaf-like fractal dense Ag network structure.(4)Aiming at the insufficient research on the theoretical calculation of sheet resistance of metal network electrodes,this paper proposes a method combining image processing and Kirchhoff's law to realize the calculation of sheet resistance of metal network electrodes.This method forms a resistance network model by filtering the optical picture of the metal network electrode and extracting it by segmentation.Using Kirchhoff's law of current and voltage to equivalently replace the resistance network model,and simple series-parallel simplified calculation to achieve the sheet resistance calculation of the metal network.The result show that the calculation combination is close to the test data and has the same trend.(5)Due to the problem of that the weak bonding force between the conductive layer and the flexible substrate in the current metal network transparent electrode.In this paper,a rootlike Ag network structure flexible transparent conductive electrode was prepared by simulating the bamboo root structure.The electrode realizes the efficient combination of the conductive metal network layer and the flexible substrate and has excellent photoelectric performance(transmittance is about 85%,square resistance is 2.2 ? / sq)and mechanical properties(sheet resistance after continuous bending for 350 times is less than 10 ? / sq).