Preparation method for flexible transparent conductive thin film with high thermal stability and product thereof

Abstract

The invention discloses a preparation method for a flexible transparent conductive thin film with high thermal stability. The preparation method comprises the steps of step 1, uniformly coating the surface of a tidy and smooth target substrate with a one-dimension-structured conductive metal nanomaterial, and forming a conductive network structure; step 2, performing blade coating on the surface of the target substrate with the conductive network structure to form a precursor coating layer containing fluorinated polyimide; step 3, performing a curing process on the precursor coating layer containing fluorinated polyimide through a gradient temperature rise manner; and step 4, peeling off the cured fluorinated polyimide contained film layer from the target substrate to obtain the required finished product. The invention also discloses a corresponding flexible transparent conductive thin film product and characteristics of the product. Through the preparation method, the flexible transparent conductive thin film can be prepared in an efficient manner, and the quality control can be performed conveniently; and the prepared flexible transparent conductive thin film has the characteristics of low sheet resistance, high visible light transmittance, anti-ultraviolet property, high flexibility, low surface roughness, excellent high-temperature endurance and the like.

Description

technical field [0001] The invention belongs to the field of preparation of photoelectric thin film components, and more specifically relates to a preparation method of a flexible transparent conductive film with high thermal stability and a product thereof. Background technique [0002] With the increasing demand for integration and flexibility of optoelectronic devices, the application technology based on large-area printable flexible optoelectronic thin film devices has become one of the key research contents in the optoelectronic field. As one of the core components, the quality of the transparent flexible electrode has also become one of the key factors affecting the performance of printed solar cells, flexible displays, smart sensors and touch components. These devices require electrodes not only to have excellent and stable optoelectronic properties, but also to be thin, soft, low-cost, adaptable to mass production, and have good repeatable bending mechanical stabilit...

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Problems solved by technology

[0003] In the prior art, a variety of materials have been proposed as potential alternatives that have been extensively developed, such as indium-doped tin oxide (ITO) and aluminum-doped tin oxide (ITO) sputtered on flexible substrates using conductive oxides. AZO), etc., but there are large defects in the mechanical stability of the film; and in terms of flexibility, more conductive polymers, carbon nanotubes and one-dimensional metal nanomaterials can be used as candidate materials.

However, through comparison, it can be found that: conductive polymers have low conductivity and poor thermal stability; carbon-based materials such as carbon nanotubes have high barriers to electron transmission at intersections due to their surface inertness, resulting in large contact resistance; In contrast, the transparent film based on the one-dimensional metal nanomaterial network structure has a simple preparation process, high conductivity and good flexibility, so it has broad development prospects.

[0004] However, further studies have shown that the above-mentioned existing solutions still have the following defects or deficiencies: First, due to the Rayleigh instability effect in the preparation process of one-dimensional metal nanomaterials, it is often easy to cause its thermal stability to be lower than that of bulk materials. Second, when the commonly used transparent flexible polymer is used as the substrate, such as polyethylene terephthalate (PET), etc., its thermal stability is generally poor, and it is generally unable to withstand many optoelectronic device manufacturing processes. Higher temperature, such as evaporation, annealing heat treatment steps, etc.; finally, even if some materials that can withstand higher temperatures are used as flexible substrates, such as polyimide film (Kapton), etc., but tests show that its visible light transmittance The pass rate is often not high, so it cannot meet the substrate production requirements of transparent conductive films

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