CN114883500A - Organic solar cell processed by non-halogen solvent and based on polythiophene system and preparation method thereof - Google Patents

Organic solar cell processed by non-halogen solvent and based on polythiophene system and preparation method thereof Download PDF

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CN114883500A
CN114883500A CN202210363005.5A CN202210363005A CN114883500A CN 114883500 A CN114883500 A CN 114883500A CN 202210363005 A CN202210363005 A CN 202210363005A CN 114883500 A CN114883500 A CN 114883500A
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叶轩立
杨婕
张桂传
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South China University of Technology SCUT
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Abstract

The invention discloses a polythiophene system-based organic solar cell processed by a non-halogen solvent and a preparation method thereof, wherein the polythiophene system-based organic solar cell comprises a substrate and an organic solar cell element, wherein the organic solar cell element sequentially comprises an anode, a hole transport layer, an active layer, an electron transport layer and a cathode from bottom to top; the active layer is a binary mixture of a polythiophene derivative donor and a non-fullerene small molecule acceptor. The invention utilizes the characteristic that thiophene solvents are similar to and compatible with polythiophene derivative donor materials, develops the organic solar cell of a high-efficiency polythiophene system processed by non-halogen solvents, obtains device performance equivalent to that of halogen solvent processing reported in documents, and simultaneously reduces toxicity generated by the solvents in the processing process. The technology greatly promotes the commercialization process of low-cost organic solar cells based on polythiophene systems.

Description

Organic solar cell processed by non-halogen solvent and based on polythiophene system and preparation method thereof
Technical Field
The invention belongs to the technical field of organic photoelectric devices, and relates to a polythiophene system-based organic solar cell processed by a non-halogen solvent and a preparation method thereof.
Background
With the rapid development of the social economy in the world, the demand of people for energy is increasing day by day, the conventional fossil energy is non-renewable and has limited reserves, and the environmental problems such as air pollution, greenhouse effect and the like caused by the use of the fossil energy are increasingly aggravated. Solar energy is considered to be one of the potential new energy sources due to the characteristics of cleanness, environmental protection, no pollution, abundant reserves, wide distribution and the like. The organic solar cell has the advantages of low cost, light material weight, simple solution processing technology, good flexibility, capability of being prepared into large-area flexible devices by adopting methods such as printing, ink jet and the like, and shows great potential for being applied to large-scale commercial production. At present, most of research on organic solar cells focuses on improving power conversion efficiency and stability, and a great deal of work is done on aspects such as material design, device structure process and morphology regulation. In the last years, as non-fullerene acceptor materials are more and more focused and researched, the power conversion efficiency of non-fullerene acceptor-based organic solar cell devices is rapidly improved, but the aspects of material cost, green processing and the like are still key problems on the large-scale commercialization road.
On the other hand, among polymer donor materials, polythiophene derivatives represented by poly (3-hexylthiophene) have received much research and attention due to their simple structure, low cost, easy synthesis, and good hole transport properties. However, organic solar cells based on polythiophene derivatives still have poorer power conversion efficiency than cell devices based on D-a type conjugated polymers composed of electron donors (Donor, D) and electron acceptors (Acceptor, a) alternately. Heretofore, the Xuanyi et al at southern China university [ Xiao J Jia X, Duan C, et al. Suriding 13% Efficiency for Polythiophene Organic Solar Cells Processed from non-halogenated Solvent [ J ]. Advanced Materials,2021,2008158] introduced a fluorinated Polythiophene derivative P4T2F-HD, and realized a 13.65% recording of the power conversion Efficiency of a Polythiophene system Organic Solar cell Processed with non-halogen Solvent o-xylene (o-XY) by optimizing the miscibility and morphology of the P4T2F-HD: Y6-BO active layer film. And Houxishi et al (Ren J, Bi P, Zhang J, et al. molecular design reviews the low-cost PTV-polymer for high hlly effective organic solar cells [ J ]. National Science Review,2021, Vol.8, nwab031], in the chemical research institute of Chinese academy of sciences, synthesizes a new polythiophene derivative donor PTVT-T, and after the mixture is processed by using a chloroform solvent together with a non-fullerene small molecule receptor, an organic solar cell with the power conversion efficiency as high as 16.2% can be obtained.
Most of the existing polythiophene-based high-efficiency organic solar cells are processed by using halogen solvents with high toxicity, such as Chloroform (CF), Chlorobenzene (CB), 1, 2-Dichlorobenzene (DCB) and the like. These solvents are not only harmful to human health, but also pollute the environment, which is very disadvantageous for the future large-scale commercial production of organic solar cells. Therefore, it is necessary to find some special non-halogen solvents capable of dissolving such polythiophene derivatives, and develop a high-efficiency organic solar cell process using non-halogen solvent processing, even green solvent processing, so that the polythiophene-based organic solar cell system is more suitable for the conditions of commercial production application.
Disclosure of Invention
In an attempt to process an organic solar cell based on a polythiophene derivative donor PTVT-T using a non-halogen solvent, it was found that PTVT-T has low solubility in some conventional non-halogen solvents such as o-xylene, Tetrahydrofuran (THF), toluene, 1,2, 4-trimethylbenzene, and it is difficult to form a thin film having a uniform nano-scale thickness due to its good crystallinity.
In order to solve the problems that the prior polythiophene high-efficiency system mostly adopts halogen solvent with high toxicity in the solution processing process and is difficult to process in the conventional non-halogen solvent, the invention provides a method for preparing a polythiophene system-based high-efficiency organic solar cell by processing the non-halogen solvent, thereby realizing the result of reducing the toxicity of the solvent in the processing process and further adapting to the conditions of commercial production.
The present invention further develops a new non-halogen processing solvent and solvent combination suitable for the preparation of high efficiency organic solar cells, in particular for the preparation of a material system based on polythiophene derivative donors.
The invention is realized by the following technical scheme:
the organic solar cell comprises a substrate, an anode, a hole transport layer, an active layer, an electron transport layer and a cathode which are stacked in sequence from bottom to top. The active layer is a binary blend of polythiophene derivatives serving as donors and non-fullerene small molecules serving as receptors.
The structural formula of the polythiophene derivative donor is shown as the formula (1):
Figure BDA0003583486480000021
wherein n is a natural number of 1-10000, R is an alkyl group with 1-30 carbon atoms, or one or more carbon atoms on the alkyl group of C1-C30 are substituted by more than one functional group of oxygen atom, alkenyl, alkynyl, aryl or ester group, or one or more hydrogen atoms on the alkyl group of C1-C30 are substituted by more than one functional group of fluorine atom, chlorine atom, bromine atom and iodine atom.
The structural formula of the non-fullerene small molecule receptor is shown as the formula (2):
Figure BDA0003583486480000031
wherein R is 1 、R 2 Independently, the alkyl group is an alkyl group with 1-30 carbon atoms, or a group in which one or more carbon atoms on the alkyl group with C1-C30 are substituted by more than one functional group of oxygen atom, alkenyl group, alkynyl group, aryl group or ester group, or a group in which one or more hydrogen atoms on the alkyl group with C1-C30 are substituted by more than one functional group of fluorine atom, chlorine atom, bromine atom, iodine atom, alkoxy chain, alkenyl group, alkynyl group, aryl group or ester group; x is a hydrogen atom, a fluorine atom, a chlorine atom, a bromine atom, an iodine atom, or an alkoxy chain substituent; y is oxygen atom, sulfur atom, cesium atom, nitrogen atom substituent connected with R group, wherein R group is alkyl with 1-30 carbon atoms, or C1-C30 alkyl group with one or more carbon atoms substituted by more than one functional group of alkoxy chain, alkenyl, alkynyl, aryl or ester group, or C1-C30 alkyl groupA group in which one or more hydrogen atoms are substituted with one or more functional groups selected from a fluorine atom, a chlorine atom, a bromine atom, an iodine atom, an alkoxy chain, an alkenyl group, an alkynyl group, an aryl group, and an ester group.
Preferably, the mass ratio of the polythiophene derivative donor to the non-fullerene small molecule acceptor in the active layer is 1: 0.5-1: 3, and the thickness is 50-300 nm.
Preferably, the substrate is transparent glass.
Preferably, the anode is ITO, and the thickness of the anode is 100-200 nm.
Preferably, the hole transport layer is PEDOT PSS, namely a poly ethoxy thiophene (PEDOT) film doped with polystyrene sulfonic acid (PSS), and the thickness of the hole transport layer is 30-50 nm.
Preferably, the electron transport layer is PFN-Br (poly [ (9, 9-bis (3' - (N, N-dimethylamino) propyl) fluorenyl-2, 7-diyl) -ALT- [ (9, 9-di-N-octylfluorenyl-2, 7-diyl) -bromine), and the thickness of the electron transport layer is 5 to 10 nm.
Preferably, the cathode is Ag, and the thickness of the cathode is 80-120 nm.
The preparation method of the organic solar cell based on the polythiophene system and processed by the non-halogen solvent comprises the following steps:
(1) cleaning the glass substrate coated with the ITO layer and putting the glass substrate into an oven for drying;
(2) spin-coating a PEDOT (patterned sapphire substrate) PSS solution on the ITO layer to form a hole transport layer, wherein the rotation speed is 3000-4000 rpm, and the thickness is 30-50 nm; then carrying out thermal annealing treatment at 140-160 ℃ for 10-20 min;
(3) dissolving a polythiophene derivative donor and a non-fullerene small-molecule receptor in an organic solvent, heating, stirring and dissolving to prepare a donor with the concentration of 2.5-4 mg/mL -1 Heating and spin-coating the active layer solution on the electron transport layer at 70-90 ℃ to serve as an active layer, wherein the rotating speed is 800-3000 rpm, and then carrying out thermal annealing treatment at 80-110 ℃ for 5-20 min;
(4) and spin-coating a PFN-Br solution on the active layer to serve as an electron transport layer, wherein the thickness of the electron transport layer is 5-10 nm.
(5) And vacuum evaporating Ag on the electron transport layer to form a cathode with a thickness of 80-120 nm.
Preferably, the heating temperature for heating, stirring and dissolving in the step (3) is 70 ℃, and the stirring time is 6-12 hours.
Preferably, the organic solvent in step (3) is one of thiophene, 3-methylthiophene, or a mixed solvent in which thiophene and 3-methylthiophene are mixed in any ratio.
Compared with the prior art, the invention has the following advantages and beneficial effects:
(1) the invention provides a novel non-halogen solvent which can be used for preparing a high-efficiency organic solar cell and a non-halogen solvent combination by using the non-halogen solvent to prepare the organic solar cell based on a polythiophene system. The invention develops the organic solar cell of a high-efficiency polythiophene system processed by a non-halogen solvent by utilizing the characteristic that a thiophene solvent is similar to and compatible with a polythiophene derivative donor material.
(2) The organic solar cell device based on the polythiophene donor PTVT-T system solves the problems that the existing polythiophene system is low in solubility in the conventional non-halogen solvent and difficult to process into a film, maintains the device performance of the original system to a great extent, and reduces the toxicity generated by the solvent in the processing process. The commercialization process of low-cost organic solar cells based on polythiophene systems is promoted.
Drawings
Fig. 1 is a schematic diagram of the structure of an organic solar cell device prepared in the embodiment of the present invention.
Fig. 2 is a graph of current density-voltage characteristics of organic solar cells prepared based on different processing solvents in examples 1 and 2 and under the optimal solvent conditions in example 3 according to the present invention.
Fig. 3 is a graph of the external quantum efficiency of organic solar cell devices prepared based on different processing solvents in examples 1 and 2 of the present invention.
FIG. 4 is a graph of the thin film absorption spectra of the active layer of the organic solar cell material system based on polythiophene donors in examples 1,2 of the present invention.
Detailed Description
The technical effects of the present invention will be described below with reference to examples and drawings, but the embodiments of the present invention are not limited thereto.
Example 1
Fig. 1 is a schematic structural diagram of an organic solar cell prepared according to an embodiment of the present invention. As shown in FIG. 1, the organic solar cell adopts a front-mounted structure, and sequentially comprises a substrate layer 1, a transparent conductive anode layer 2(ITO), a hole transport layer 3(PEDOT: PSS), an active layer 4(PTVT-T: BTP-eC9), an electron transport layer 5(PFN-Br) and a metal cathode 6(Ag) from bottom to top. The device structure is ITO/PEDOT, PSS/PTVT-T, BTP-eC 9/PFN-Br/Ag.
The specific preparation method of the organic solar cell comprises the following steps:
(1) ultrasonically cleaning the glass substrate coated with the ITO layer by using isopropanol, a detergent, deionized water and isopropanol in sequence, drying in a drying box, and placing in a culture dish for later use;
(2) PSS solution (purchased from Heraeus, Clevios-4083, the same material is used in the other examples) is spin-coated on the ITO layer as a hole transport layer, the rotation speed is 4000rpm, and the thickness is 40 nm; then carrying out thermal annealing treatment at 150 ℃ for 15 min;
(3) polythiophene derivative donor material PTVT-T (purchased from Organtec, same material was used in other examples) and non-fullerene small molecule acceptor BTP-eC9 (purchased from Derthon, same material was used in other examples) were mixed in a mass ratio of 1:1.2, and dissolved in thiophene solvent (purchased from Sigma-Aldrich) to give a donor concentration of 2.7mg mL -1 Then stirred at 70 ℃ for 6 h. When the active layer is prepared, the solution of the active layer is heated at 90 ℃ by adopting hot throwing, and the substrate coated with PEDOT, PSS is preheated to 90 ℃; then spin-coating the active layer solution on the hole transport layer at the rotation speed of 1000rpm to prepare an active layer with the thickness of 100nm, and then carrying out thermal annealing treatment for 10min at the temperature of 80 ℃;
(4) the interfacial layer material PFN-Br (purchased from Organtec, same material used in the remaining examples) was dissolved in methanol solvent (purchased from Sigma-Aldr)The same materials as used in the other examples, manufactured by ich corporation) was prepared at a concentration of 0.5 mg. multidot.mL -1 The solution of (2) is spin-coated on the active layer to be used as an electron transport layer, the rotating speed is 2000rpm, and the thickness is 10 nm;
(5) and thermally evaporating Ag in vacuum on the electron transport layer to form a cathode with the thickness of 100 nm.
The chemical structure of the polythiophene derivative donor PTVT-T described in this example is as follows:
Figure BDA0003583486480000061
the chemical structural formula of the non-fullerene small molecule receptor BTP-eC9 is as follows:
Figure BDA0003583486480000062
example 2
The specific preparation method of the organic solar cell with the structure of ITO/PEDOT, PSS/PTVT-T, BTP-eC9/PFN-Br/Ag comprises the following steps:
(1) ultrasonically cleaning the glass substrate coated with the ITO layer by using isopropanol, a detergent, deionized water and isopropanol in sequence, drying in a drying box, and placing in a culture dish for later use;
(2) spin-coating a PEDOT (Poly ethylene glycol ether ketone) PSS solution on the ITO layer to be used as a hole transport layer, wherein the rotation speed is 4000rpm, and the thickness is 40 nm; then carrying out thermal annealing treatment at 150 ℃ for 15 min;
(3) mixing a polythiophene derivative donor material PTVT-T and a non-fullerene small molecule receptor BTP-eC9 according to a mass ratio of 1:1.2, dissolving in a 3-methylthiophene solvent to prepare a donor with a donor concentration of 3.6 mg/mL -1 Then stirred at 70 ℃ for 6 h. When the active layer is prepared, the solution of the active layer is heated at 80 ℃ by adopting hot throwing, and the substrate coated with PEDOT, PSS is preheated to 80 ℃; then spin-coating the active layer solution on the hole transport layer at the rotation speed of 1000rpm to prepare an active layer with the thickness of 100nm, and then carrying out thermal annealing treatment for 10min at the temperature of 80 ℃;
(4) dissolving the interface layer material PFN-Br in methanol solvent to prepare the solution with the concentration of 0.5 mg/mL -1 The solution of (2) is spin-coated on the active layer to be used as an electron transport layer, the rotating speed is 2000rpm, and the thickness is 10 nm;
(5) and thermally evaporating Ag in vacuum on the electron transport layer to form a cathode with the thickness of 100 nm.
The organic solar cell devices prepared in examples 1 and 2 were subjected to photovoltaic performance tests, and organic solar cell devices processed using chloroform as a halogen solvent were prepared for comparison, and the results of the performance of the cell devices are shown in table 1, and the current density-voltage characteristic curves of the devices are shown in fig. 2.
Fig. 4 shows the absorption spectra of the active layers prepared in examples 1 and 2 based on different processing solvents. It can be seen that the thin film spectrum of the PTVT-T BTP-eC9 system in the presence of non-halogen solvent is similar to the absorption curve in the presence of halogen solvent, and the absorption peak is only slightly red-shifted, indicating that the polythiophene derivative donor still retains its similar polymerization characteristics in chloroform in the presence of non-halogen solvent. The external quantum efficiency of the organic solar cell devices prepared in examples 1 and 2 is shown in fig. 3, and the EQE of the devices has a strong response in the visible to near infrared wavelength range, which is consistent with the absorption characteristics of the active layer system shown in fig. 4.
TABLE 1 PTVT-T BTP-eC9 System organic solar cell device Performance parameters based on different solvent processing
Figure BDA0003583486480000071
As can be seen from table 1 and fig. 2, the performance of the organic solar cell processed by using thiophene is very close to that of the cell processed by using chloroform, the power conversion efficiency is reduced less, and the short-circuit current density is increased; the organic solar cell processed by the 3-methylthiophene has small difference of short-circuit current density, but the open-circuit voltage is obviously reduced, so that the power conversion efficiency is reduced. This indicates that the PTVT-T BTP-eC9 system can maintain similar light absorption and photoelectric conversion under thiophene and 3-methylthiophene solvent processing conditions as under chloroform processing. From the appearance of the active layer film, the solubility of the donor material in the thiophene solvent was inferior to that of chloroform and 3-methylthiophene, and the processed active layer film still had a small amount of non-uniformity with the naked eye, and further, the processing reproducibility was slightly poor.
Examples 1,2 illustrate that the polythiophene-based material system PTVT-T BTP-eC9 can be dissolved using two non-halogen solvents, thiophene or 3-methylthiophene, and processed to produce a film.
Example 3
The specific preparation method of the organic solar cell comprises the following steps:
(1) ultrasonically cleaning the glass substrate coated with the ITO layer by using isopropanol, a detergent, deionized water and isopropanol in sequence, drying in a drying box, and placing in a culture dish for later use;
(2) spin-coating a PEDOT (Poly ethylene glycol ether ketone) PSS solution on the ITO layer to be used as a hole transport layer, wherein the rotation speed is 4000rpm, and the thickness is 40 nm; then carrying out thermal annealing treatment at 150 ℃ for 15 min;
(3) mixing a polythiophene crystal polymer donor material PTVT-T and a non-fullerene small molecule receptor BTP-eC9 according to a mass ratio of 1:1.2, mixing a thiophene solvent and a 3-methylthiophene solvent according to a volume ratio of 0.7:0.3, 0.5:0.5 and 0.3:0.7 to prepare a series of mixed solvents, and then respectively dissolving donor materials in the mixed solvents to prepare donor concentrations of 3 mg/mL -1 ，3.4mg·mL -1 ，3.6mg·mL -1 ，3.5mg·mL -1 Then stirred at 70 ℃ for 6 h. When the active layer is prepared, the solution of the active layer is heated at 80 ℃ by adopting hot throwing, and the substrate coated with PEDOT, PSS is preheated to 80 ℃; then spin-coating the active layer solution on the hole transport layer at the rotation speed of 1000rpm to prepare an active layer with the thickness of 100nm, and then carrying out thermal annealing treatment for 10min at the temperature of 80 ℃;
(4) dissolving the interface layer material PFN-Br in methanol solvent to prepare the solution with the concentration of 0.5 mg/mL -1 The solution of (2) is spin-coated on the active layer to be used as an electron transport layer, the rotating speed is 2000rpm, and the thickness is 10 nm;
(5) and thermally evaporating Ag in vacuum on the electron transport layer to form a cathode with the thickness of 100 nm.
The photovoltaic performance of the organic solar cell in this example was tested, the performance results of the cell device are shown in table 2, and the current density-voltage characteristic curve of the device is shown in fig. 2.
Table 2 is based on different thiophenes: PTVT-T: BTP-eC9 system organic solar cell device performance parameters processed by 3-methylthiophene mixed solvent
Figure BDA0003583486480000081
In order to further optimize the film morphology and improve the performance repeatability of the device, a mixed solvent processing method is further tried to be adopted to integrate the advantages of two non-halogen solvent processing devices. 3-methyl thiophene solvent is selected as a main body, the content of the thiophene solvent is gradually increased in the 3-methyl thiophene solvent, and the good film-forming property of an active layer is kept while the performance of the device is improved. An organic solar cell device processed based on a mixed solvent of thiophene and 3-methylthiophene is prepared, and the structure of the device is shown in figure 1.
As can be seen from table 2, as the content of thiophene in the mixed solvent increases, the battery performance can be gradually improved to approach the performance result of devices processed by thiophene, and the open-circuit voltage, the short-circuit current density and the power conversion efficiency all show regular improvements. However, when the thiophene content is higher than 70%, the power conversion efficiency is not obviously improved, the active layer film prepared by the spin-coating method begins to have a more obvious unevenness phenomenon, and the repeatability of the device performance is reduced. It can also be seen from the current density-voltage characteristic curve (as shown in fig. 2) that the device processed by using the mixed solvent can effectively retain the higher short-circuit current density and filling factor of the device processed by pure chloroform or thiophene. Thus, thiophene: 3-methylthiophene in a volume ratio of 0.7:0.3 is considered the most preferred combination of processing solvents.
This example further demonstrates that thiophene mixed solvent combination with 3-methylthiophene can be a viable non-halogen solvent combination for processing high efficiency organic solar cells based on polythiophene systems.
The above description is only a preferred embodiment of the present invention, and all equivalent changes and modifications made in accordance with the claims of the present invention should be covered by the present invention.

Claims (10)

1. The organic solar cell based on the polythiophene system and processed by the non-halogen solvent is characterized by comprising a substrate, an anode, a hole transport layer, an active layer, an electron transport layer and a cathode which are stacked from bottom to top in sequence; the active layer is a binary blend of a polymer donor and a non-fullerene small molecule acceptor.
2. A non-halogen solvent processed polythiophene system based organic solar cell according to claim 1, wherein said polymer donor is a polythiophene derivative; the acceptor is a non-fullerene small molecule; the thickness of the active layer is 50-300 nm.
3. The non-halogen solvent processed polythiophene system based organic solar cell of claim 2, wherein said polythiophene derivative has the following structure:
Figure FDA0003583486470000011
wherein n is a natural number of 1-10000, R is an alkyl group with 1-30 carbon atoms, or one or more carbon atoms on the alkyl group of C1-C30 are substituted by more than one functional group of oxygen atom, alkenyl, alkynyl, aryl or ester group, or one or more hydrogen atoms on the alkyl group of C1-C30 are substituted by more than one functional group of fluorine atom, chlorine atom, bromine atom and iodine atom.
4. The non-halogen solvent processed polythiophene system based organic solar cell of claim 1, wherein said non-fullerene small molecule acceptor has the following structure:
Figure FDA0003583486470000012
wherein R is 1 、R 2 Independently, the alkyl group is an alkyl group with 1-30 carbon atoms, or a group in which one or more carbon atoms on the alkyl group with C1-C30 are substituted by more than one functional group of oxygen atom, alkenyl group, alkynyl group, aryl group or ester group, or a group in which one or more hydrogen atoms on the alkyl group with C1-C30 are substituted by more than one functional group of fluorine atom, chlorine atom, bromine atom, iodine atom, alkoxy chain, alkenyl group, alkynyl group, aryl group or ester group; x is a hydrogen atom, a fluorine atom, a chlorine atom, a bromine atom, an iodine atom, or an alkoxy chain substituent; y is an oxygen atom, a sulfur atom, a cesium atom, a nitrogen atom substituent group connected with the R group, wherein the R group is an alkyl group with 1-30 carbon atoms, or a group in which one or more carbon atoms on the alkyl group with C1-C30 are substituted by more than one functional group of an alkoxy chain, an alkenyl group, an alkynyl group, an aryl group or an ester group, or a group in which one or more hydrogen atoms on the alkyl group with C1-C30 are substituted by more than one functional group of a fluorine atom, a chlorine atom, a bromine atom, an iodine atom, an alkoxy chain, an alkenyl group, an alkynyl group, an aryl group or an ester group.
5. The non-halogen solvent processed polythiophene system based organic solar cell of claim 1, wherein a mass ratio of the polymer donor to the non-fullerene small molecule acceptor is 1: 0.5-1: 3.
6. The non-halogen solvent processed polythiophene system based organic solar cell of claim 1, wherein said substrate is glass; the anode is an ITO layer and is coated on the substrate, and the thickness of the anode is 100-200 nm; the hole transport layer is PEDOT, PSS and has the thickness of 30-50 nm; the electron transport layer is PFN-Br, and the thickness is 5-10 nm; the cathode is Ag, and the thickness of the cathode is 80-120 nm.
7. The method for preparing a non-halogen solvent processed polythiophene system based organic solar cell according to any one of claims 1 to 6, comprising the steps of:
(1) cleaning the glass substrate coated with the ITO layer and putting the glass substrate into an oven for drying;
(2) spin-coating a PEDOT (patterned sapphire substrate) PSS solution on the ITO layer to form a hole transport layer, wherein the rotation speed is 3000-4000 rpm, and the thickness is 30-50 nm; then carrying out thermal annealing treatment at 140-160 ℃ for 10-20 min;
(3) dissolving a polythiophene derivative donor and a non-fullerene micromolecular acceptor in an organic solvent, heating, stirring and dissolving to prepare an active layer solution, heating and spin-coating the active layer solution on an electron transmission layer at 70-90 ℃ to serve as an active layer, wherein the rotating speed is 800-3000 rpm, and then carrying out thermal annealing treatment at 80-110 ℃ for 5-20 min;
(4) spin-coating PFN-Br solution on the active layer as an electron transport layer;
(5) and vacuum evaporating an Ag cathode on the electron transport layer.
8. The method for preparing a non-halogen solvent processing polythiophene-based system organic solar cell according to claim 7, wherein the organic solvent in the step (3) is thiophene, 3-methylthiophene, or one of mixed solvents in which thiophene and 3-methylthiophene are mixed in any ratio.
9. The method for preparing the organic solar cell based on the polythiophene system and processed by the non-halogen solvent according to claim 7, wherein the donor concentration in the active layer solution in the step (3) is 2.5-4 mg-mL -1 。
10. The method for preparing a non-halogen solvent processed polythiophene-system-based organic solar cell according to any one of claims 7-9, wherein the heating, stirring and dissolving temperature in the step (3) is 70-90 ℃, and the stirring time is 6-12 h.
CN202210363005.5A 2022-04-06 2022-04-06 Organic solar cell processed by non-halogen solvent and based on polythiophene system and preparation method thereof Pending CN114883500A (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN116444543A (en) * 2023-03-14 2023-07-18 南方科技大学 Organic photovoltaic cell receptor material and preparation method and application thereof
CN116903831A (en) * 2023-05-18 2023-10-20 天津大学 Double polythiophene material system and application thereof

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN116444543A (en) * 2023-03-14 2023-07-18 南方科技大学 Organic photovoltaic cell receptor material and preparation method and application thereof
CN116903831A (en) * 2023-05-18 2023-10-20 天津大学 Double polythiophene material system and application thereof

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