PEDOT: PSS film structure

Abstract

The utility model discloses a PEDOT: PSS (poly (3, 4-ethylenedioxythiophene): poly (styrenesulfonate)) film structure which comprises a bottom layer, a transition layer and a conductive layer, the bottom layer, the transition layer and the conductive layer are sequentially arranged on the substrate from bottom to top; the bottom layer is thinner than the transition layer. According to the PEDOT: PSS thin film structure disclosed by the utility model, the optimized thin film structure with a three-layer structure is adopted, the first layer is the bottom layer thin film which is relatively thin, so that the condition that the thin film is broken due to the problems that the thin film is too thick, the shrinkage stress is relatively large, the drying rate is non-uniform, the solvent residue is more, the acting force between molecules is different and the like can be avoided; waste of initial materials is avoided; the transition layer arranged on the second layer can solve the problem that the thickness is not uniform due to the fact that the bottom layer film is thin, the bottom layer film cannot be damaged, the uniformity of the thickness of the film is achieved, the conducting layer arranged on the third layer can further guarantee the uniformity of the thickness of the film, and meanwhile the conducting performance of the film and the quality of the film can be guaranteed.

Description

Technical Field

[0001] This utility model relates to the field of PEDOT:PSS thin film technology, and in particular to a PEDOT:PSS thin film structure. Background Technology

[0002] Poly(3,4-ethylenedioxythiophene):polystyrene sulfonate (PEDOT:PSS) possesses advantages such as high conductivity, excellent stability, high flexibility, ease of film formation, and low cost, making it considered one of the most valuable conductive polymers with broad application prospects in energy storage, conversion, and electronic systems. However, the low conductivity of pristine PEDOT:PSS films hinders their practical application due to their high conductivity. Adding organic polar solvents is one of the most common methods to enhance the conductivity of PEDOT:PSS films, effectively increasing it by two to three orders of magnitude.

[0003] However, PEDOT:PSS is currently a single-layer film. Single-layer PEDOT:PSS films have problems such as uneven thickness and easy breakage, which affect the conductivity of the entire film and the quality of the film, and cannot fully meet the needs of various applications. Utility Model Content

[0004] This invention provides a PEDOT:PSS thin film structure to overcome the above-mentioned problems.

[0005] To achieve the above objectives, the technical solution of this utility model is as follows:

[0006] A PEDOT:PSS thin film structure includes an underlayer, a transition layer, and a conductive layer;

[0007] The bottom layer, the transition layer, and the conductive layer are sequentially disposed on the substrate from bottom to top;

[0008] The thickness of the bottom layer is less than the thickness of the transition layer.

[0009] Furthermore, the thickness of the bottom layer ranges from 20 to 30 nm;

[0010] The thickness of the transition layer ranges from 60 to 70 nm;

[0011] The thickness of the conductive layer ranges from 10 to 100 nm.

[0012] Furthermore, the bottom layer, the transition layer, and the conductive layer are all made of PEDOT:PSS mixed with dopants;

[0013] The dopant is a mixture of two types of solvents: a polar solvent and a polar alcohol solvent.

[0014] Furthermore, the substrate is a glass substrate.

[0015] Furthermore, the bottom layer, the transition layer, and the conductive layer are all prepared by spraying.

[0016] The beneficial effects of this utility model are:

[0017] The PEDOT:PSS thin film structure disclosed in this utility model adopts an optimized three-layer structure. The first layer is a relatively thin bottom film, which can avoid the film cracking caused by excessively thick films, such as large shrinkage stress, uneven drying rate, excessive solvent residue, and differences in intermolecular forces. The second layer is a transition layer, which can solve the uneven thickness caused by the thin bottom film without damaging the bottom film, thus achieving uniform film thickness. The third layer is a conductive layer, which can further ensure the uniformity of film thickness, as well as the conductivity of the film, thus ensuring film quality. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 This is a schematic diagram of a PEDOT:PSS thin film structure disclosed in an embodiment of the present invention.

[0020] In the diagram: 1. Substrate; 2. Bottom layer; 3. Transition layer; 4. Conductive layer. Detailed Implementation

[0021] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0022] Example:

[0023] like Figure 1 The image shows a PEDOT:PSS thin film structure provided in this embodiment, including a bottom layer 2, a transition layer 3, and a conductive layer 4;

[0024] The bottom layer 2, the transition layer 3, and the conductive layer 4 are sequentially disposed on the substrate 1 from bottom to top;

[0025] The thickness of the bottom layer 2 is less than the thickness of the transition layer 3.

[0026] The PEDOT:PSS thin film structure disclosed in this utility model adopts an optimized three-layer structure. The first layer is a relatively thin bottom film, which can avoid the problems of large shrinkage stress, uneven drying rate, large solvent residue, and differences in intermolecular forces caused by excessive film thickness, thus avoiding film rupture and material waste. The second layer is a transition layer, which can solve the thickness unevenness caused by the thin bottom film without damaging the bottom film, achieving uniform film thickness. The third layer is a conductive layer, which can further ensure the uniformity of film thickness, while also ensuring the conductivity of the film and ensuring film quality.

[0027] In a specific embodiment, the thickness of the bottom layer 2 ranges from 20 to 30 nm;

[0028] The thickness of the transition layer 3 is in the range of 60-70 nm;

[0029] The thickness of the conductive layer 4 ranges from 10 to 100 nm; the thickness of the bottom layer 2 is set to 20 to 30 nm, which can ensure the conductivity of the prepared film and effectively prevent the film from cracking; the thickness of the transition layer 3 is set to 60 to 70 nm, which can ensure the uniformity of the film. Setting the thickness of the conductive layer 4 to 10 to 100 nm can further ensure the uniformity of the film and ensure the quality of the preparation. The layered preparation of the film can effectively avoid the cracking of the film that would occur when there is only one layer, and can also ensure the uniformity of the film, the conductivity, and the quality of the film preparation.

[0030] In a specific embodiment, the bottom layer 2, the transition layer 3, and the conductive layer 4 are all made of PEDOT:PSS mixed with dopants;

[0031] The dopant is a mixture of a polar solvent and a polar alcohol solvent. The polar solvent can be selected from any one of the commonly used dimethyl sulfoxide, N,N-dimethylformamide, and tetrahydrofuran, and the polar alcohol solvent can be selected from any one of the commonly used ethylene glycol, sorbitol, and glycerol. The amount of both types of dopant can be adjusted according to the actual application requirements.

[0032] In a specific embodiment, the substrate 1 is a glass substrate.

[0033] In a specific embodiment, the bottom layer 2, the transition layer 3, and the conductive layer 4 are all prepared by spraying. The spraying method uses simple equipment, is easy to manufacture large-area devices, is not affected by the rigidity or flexibility of the substrate, has high material utilization, fast preparation speed, low cost, facilitates masking, and subsequent layers will not damage the previous layers when preparing multilayer devices. The spraying method is suitable for preparing this PEDOT:PSS thin film structure.

[0034] The preparation method of this PEDOT:PSS thin film structure is as follows:

[0035] (1) Preparation of PEDOT:PSS mixed aqueous dispersion: Add polar solvent and polar alcohol solvent to PEDOT:PSS aqueous dispersion respectively, and place in an ultrasonic oscillator for 30-50 minutes to obtain PEDOT:PSS mixed dispersion; wherein, the polar solvent is preferably dimethyl sulfoxide, and the amount added is 1%-10% of the mass of PEDOT:PSS aqueous dispersion, and the polar alcohol solvent is preferably ethylene glycol, and the amount added is 1%-9% of the mass of PEDOT:PSS aqueous dispersion. The composition and amount of dopant can be adjusted according to actual needs, and are not limited to the composition and amount in this embodiment;

[0036] (2) Preparation of a three-layer PEDOT:PSS film by three-stage spraying:

[0037] A certain amount of uniformly mixed PEDOT:PSS dispersion was placed in a spraying equipment, specifically an LP-186 series spraying equipment. The glass substrate underwent three ultrasonic cleanings, each lasting 20 minutes, using acetone, anhydrous ethanol, and deionized water as the cleaning solvents.

[0038] The spray gun is placed vertically parallel to the glass substrate, with a distance of 30-35cm. The spraying time is 3-30 seconds. After spraying, the glass substrate is placed in a covered petri dish and placed in a drying oven at 80°C for 20-40 minutes to obtain the first layer of PEDOT:PSS film doped with dimethyl sulfoxide and ethylene glycol, with a thickness of 20-30nm, which serves as the bottom layer in the three-layer structure.

[0039] After heating and drying a first layer of PEDOT:PSS film, it is left to stand for 20 minutes and then cooled to room temperature. A second coating is then performed to prepare a second PEDOT:PSS film with a thickness of 60-70 nm, serving as an intermediate transition layer in the three-layer structure. After heating, drying, and cooling to room temperature, a third coating is performed followed by heating and drying to obtain a third PEDOT:PSS film with a thickness of 10-100 nm, serving as a conductive layer. A schematic diagram of the resulting PEDOT:PSS film structure is shown below. Figure 1 As shown.

[0040] The PEDOT:PSS film provided in this application is not prone to cracking, and while ensuring conductivity, it can maximize the uniformity of the film, thereby ensuring conductivity and film quality.

[0041] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this utility model.

Claims

1. A PEDOT:PSS thin film structure, characterized in that, It includes a bottom layer (2), a transition layer (3), and a conductive layer (4); The bottom layer (2), the transition layer (3) and the conductive layer (4) are sequentially disposed on the substrate (1) from bottom to top; The thickness of the bottom layer (2) is less than the thickness of the transition layer (3).

2. The PEDOT:PSS thin film structure according to claim 1, characterized in that, The thickness of the bottom layer (2) ranges from 20 to 30 nm; The thickness of the transition layer (3) is in the range of 60-70 nm; The thickness of the conductive layer (4) ranges from 10 to 100 nm.

3. The PEDOT:PSS thin film structure according to claim 1, characterized in that, The substrate (1) is a glass substrate.

4. The PEDOT:PSS thin film structure according to claim 1, characterized in that, The bottom layer (2), the transition layer (3), and the conductive layer (4) are all prepared by spraying.

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