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Low-roughness and low-square-resistance flexible transparent conductive composite thin film and preparation method therefor

A transparent conductive and composite thin film technology, applied in the field of optoelectronics, can solve the problems of low carrier injection and collection efficiency of optoelectronic devices, the coverage rate of the conductive area cannot be too high, and the photoelectric conversion efficiency of low filling factor, etc., and achieve good electrical and optical performance. performance, good light transmittance and flexibility, the effect of high optoelectronic properties

Active Publication Date: 2017-05-31
HUAZHONG UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
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Problems solved by technology

[0003] However, since the conductive percolation network is built by stacking metal nanowires, the surface of the transparent electrode has a large roughness, especially at the intersection of metal nanowires, which has little effect on the touch interface, but it is applied to optoelectronic devices ( Such as organic light-emitting diodes (OLEDs) and solar cells, etc.), due to the extremely thin active layer of thin-film devices, excessive roughness can easily cause short circuits and large leakage currents; Yes, in order to ensure a high transmittance, the coverage of the conductive area of ​​the metal nanowire cannot be too high, which will result in a lower carrier injection and collection efficiency of the optoelectronic device, resulting in an extremely low fill factor or photoelectric conversion efficiency

Method used

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  • Low-roughness and low-square-resistance flexible transparent conductive composite thin film and preparation method therefor
  • Low-roughness and low-square-resistance flexible transparent conductive composite thin film and preparation method therefor
  • Low-roughness and low-square-resistance flexible transparent conductive composite thin film and preparation method therefor

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preparation example Construction

[0039] The preparation method for preparing the flexible transparent conductive composite film provided by the present invention comprises the following steps:

[0040] (1) Prepare a substrate, and coat a solution containing metal nanowires on the substrate to form a transparent conductive network film made of metal nanowires;

[0041] (2) heating removes the solvent in the above-mentioned transparent conductive network film, leaving only the conductive network formed by metal nanowires;

[0042] (3) On the substrate coated with the above-mentioned conductive network, evenly coat a layer of transparent polymer precursor solution, and in-situ solidify to form a transparent polymer film;

[0043] (4) peeling off the cured transparent polymer film from the substrate to obtain a primary composite film;

[0044] (5) Uniformly vapor-deposit or coat a transparent conductive layer on one side of the primary composite film having a conductive network composed of metal nanowires to for...

Embodiment 1

[0055] Such as figure 1 As shown, the ethanol dispersion of silver nanowires with an average aspect ratio of about 1000 was evenly coated on the glass surface with a squeegee bar, and the ethanol solvent was removed by heating, and the surface roughness was characterized by an atomic force microscope, and the square resistance was maintained at 10(±2)Ω / sq, visible light transmittance is 85%.

[0056] The fluorine-containing polyimide powder is dissolved in N,N-dimethylacetamide to prepare a fluorine-containing polyimide precursor solution with a mass ratio of 15%; then the fluorine-containing polyimide precursor solution is used The casting scraping method is used to cover the glass sheet, and the thickness of the precursor liquid is controlled to be about 200 microns.

[0057] The whole is placed in a blast drying oven for heating and curing. First, keep it warm at 60°C for 40 minutes, then use steps to raise the temperature to 90°C, 120°C, 150°C, 175°C, and 200°C for 40 min...

Embodiment 2

[0061] The silver nanowire aqueous dispersion with an average aspect ratio of about 300 is uniformly coated on a stainless steel belt by a slit coating method, and heated to remove moisture. The same fluorine-containing polyimide precursor solution in Example 1 is also used The slit coating method is used to coat the stainless steel belt with the silver nanowire conductive network, and the thickness of the precursor solution is controlled to be about 100 microns, and the subsequent process is the same as in Example 1.

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Abstract

The invention belongs to the technical field of photo-electronics, and more specifically relates to a low-roughness and low-square-resistance flexible transparent conductive composite thin film, wherein the thin film adopts a three-layer composite structure; the lowest bottom layer is provided with a transparent polymer thin film; the middle layer is provided with a conductive network formed by metal nanowires; the topmost layer is a provided with a transparent conductive layer which uniformly covers the transparent polymer thin film and the conductive network; the flexible transparent conductive composite thin film is less than 20-nanometer in average roughness, less than 30-ohm / square meter in square resistance, and greater than 80% of light transmittance within a visible light range; and the transparent conductive thin film can bear bending with radius of curvature of 2mm. The invention also discloses a preparation method for the flexible transparent conductive composite thin film. The flexible transparent conductive composite thin film provided by the invention has low roughness, high conductivity, high light transmittance, simple preparation method and low cost, and is particularly suitable for flexible display and illumination, a flexible solar battery and flexible touch equipment.

Description

technical field [0001] The invention belongs to the technical field of optoelectronics, and more specifically relates to a flexible transparent conductive composite film with low roughness and low square resistance and a preparation method thereof. The flexible transparent conductive composite film has low roughness, high conductivity and high transparency. The light rate can significantly improve the photoelectric conversion efficiency. Background technique [0002] With the rapid development of optoelectronic technology, many emerging advanced optoelectronic devices are gradually entering people's lives, and their output and output value are also increasing year by year. As one of the essential core components in optoelectronic devices, the excellent performance of transparent electrodes has become one of the key factors for the development of optoelectronics industry. The traditional ceramic-based transparent electrode materials represented by indium-doped tin oxide (ITO...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01B5/14H01B13/00
CPCH01B5/14H01B13/00H01B13/0026
Inventor 周军胡彬方云生李嘉
Owner HUAZHONG UNIV OF SCI & TECH
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