Preparation method of ultra-fine and large-height-width-ratio grid transparent electrode

Abstract

The invention discloses a preparation method of an ultra-fine and large-height-width-ratio grid transparent electrode, and belongs to the technical field of additive manufacturing and electronic devices. According to the preparation method of the super-fine and large-height-width-ratio grid transparent electrode, an electric field is used for driving the jet 3D printing and the charge-induced self-aligning to be combined. In one pulse period of the alternating-current pulse power supply, positive-voltage induction generates printing material micro-droplets with positive charges, the negative voltage induction generates the printing material micro-droplets with negative charges, after being deposited on the substrate, the micro-droplets of the charged printing material are in contact with each other, the positive and negative charges are neutralized, and then the charge-induced self-aligning is utilized to realize the accumulation of the charged printing material micro-droplets on the formed layer, and printing of the grid with the set number of layers is completed. The preparation method of the ultra-fine, large and high-width-ratio grid transparent electrode is wide in applicationrange, can obtain the high-conductivity and high-light-transmittance transparent electrode, and high-light-transmittance transparent electrode, and has good popularization and application values.

Description

technical field [0001] The invention relates to the technical fields of additive manufacturing and electronic devices, and specifically provides a method for preparing an ultrafine grid transparent electrode with a large aspect ratio. Background technique [0002] Transparent electrodes refer to conductive components with high light transmittance and low surface resistance in the visible light region. Transparent electrodes are widely used in electronic fields such as LCD and OLED displays, touch screens, organic solar cells, and optoelectronic components. At present, transparent electrodes are mainly prepared by indium tin oxide thin films, but the transparent electrodes prepared by this method have problems such as fragility and high-temperature treatment during the preparation process to damage the substrate. At the same time, indium itself, as a rare metal, also has the hidden danger of resource depletion. A new generation of transparent electrodes including graphene, ca...

AI Technical Summary

Problems solved by technology

However, these methods have certain limitations

(1) The optical lithography method can achieve high resolution of the prepared grid transparent electrode, but it is mainly oriented to two-dimensional molding, it is difficult to achieve a large aspect ratio, and the method is expensive to generate (lithography cost and material cost) , Large size is limited (currently the largest industrial grade is 12 inches); (2), when nanoimprinting is manufactured in a large area, due to the large contact area between the template and the imprinted pattern, it will cause problems such as difficulty in peeling and deformation of the imprinted pattern, Facing severe challenges in large-scale manufacturing, the preparation of high-precision templates usually requires electron beam etching or focused ion beam etching, which is time-consuming and expensive; (3), common inkjet printing methods include thermal bubble and Piezoelectric, but currently face the problem of low resolution (line width greater than 20μm), which cannot meet the requirements for transparent electrodes in many fields such as touch screens and OLEDs, and the viscosity of printing materials is limited (viscosity is usually limited to below 30cP), It is impossible to print high-viscosity materials; (4), although aerosol printing has greatly improved in printing accuracy (currently the highest resolution is 5μm) and printing material viscosity (less than 2500cP), and can achieve large height and width ratio structure, but the existing precision still cannot meet the requirements of high-resolution transparent electrodes such as OLEDs and touch screens (the line width is generally less than 5 μm, and the minimum line width is less than 2 μm), and the cost of equipment used in this method is very high. The material is limited; (5), electrohydrodynamic jet printing applies a high voltage between the nozzle (first electrode) and the substrate (second electrode), and prints a very fine jet from the tip of the nozzle in a "pull" manner, with The ability to print complex micro-nano structures with sub-micron and nano-scale resolution, and good compatibility

However, this method is difficult to meet the requirements of printing on curved conformal substrates, the printing stability is poor when printing on insulating substrates, and the printing ability of high-resolution (ultra-fine) patterns and large aspect ratio structures is insufficient.

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