An organic solar cell based on zinc acetylacetonate doped pdino and a preparation method thereof

Abstract

The application discloses an organic solar cell based on zinc acetylacetonate doped PDINO and a preparation method thereof. The structure of the organic solar cell based on zinc acetylacetonate doped PDINO comprises, from bottom to top, a glass substrate, an anode, a hole transport layer, a photoactive layer, an electron transport layer and a cathode in sequence, wherein the electron transport layer is composed of zinc acetylacetonate and PDINO; the zinc acetylacetonate accounts for 5-50 wt% of the electron transport layer. The application adopts zinc acetylacetonate doped PDINO as the electron transport layer, improves the conductivity of PDINO and adjusts the energy level, thereby improving the open-circuit voltage, the short-circuit current density and the fill factor of the device, and making the device obtain more excellent performance. In addition, the energy conversion efficiency of the optimized device is not sensitive to the thickness change of the electron transport layer, which is beneficial to realize large-area high-efficiency devices, solves the problems existing in the prior art, and has a good application prospect.

Description

Technical Field

[0001] This invention relates to the field of organic semiconductor thin-film solar cell technology, and in particular to an organic solar cell based on zinc acetylacetonate doped PDINO and its preparation method. Background Technology

[0002] Organic solar cells (OSCs) have attracted increasing research and attention due to their low cost advantage from solution processing, coupled with their flexibility, semi-transparency, and lightweight properties. Over the past two decades, extensive research and rapid development have been undertaken in OSCs. Since 2015, thanks to the invention of fused-ring small molecule acceptors and the development of matching polymer donors, the power conversion efficiency of single-junction OSC devices has exceeded 18%. Besides acceptor-donor structure optimization and active layer morphology control, interface engineering is also an effective method to improve device performance. For example, by inserting an electron transport layer between the active layer and the cathode electrode, the work function of the electrode can be adjusted, improving the interfacial contact between the active layer and the cathode, reducing recombination of photogenerated carriers during transport, thereby improving device performance.

[0003] Currently, alcohol-soluble polymers and alcohol-soluble small molecules are the most widely used electron transport layer materials in upright OSCs (Optical System Chips). Alcohol-soluble polymers exhibit good environmental stability and good morphology after film formation. PFN-Br and PNDIT-F3N-Br are currently the most commonly used polymer electron transport layers, but their complex synthesis routes increase production costs. Compared to alcohol-soluble polymers, alcohol-soluble small molecules have simpler synthesis steps and lower production costs. Among them, PDINO exhibits good morphology after film formation, and its synthesis is simple with high yield, making it the most commonly used alcohol-soluble small molecule electron transport layer. However, compared to other alcohol-soluble polymers and small molecule materials, PDINO's conductivity still has significant room for improvement. PDINO's relatively low conductivity makes it easier for charge carriers in the device to recombine during transport, resulting in a lower fill factor. Therefore, improving the conductivity of PDINO is beneficial for further improving charge carrier transport in the device, leading to superior device performance.

[0004] In summary, there is an urgent need to develop a new type of organic solar cell that improves the electron transport capability of the PDINO electron transport layer, thereby enhancing the photoelectric performance of the device, in order to solve the problems existing in the current technology and meet the needs of actual production. Summary of the Invention

[0005] Based on this, the present invention provides an organic solar cell based on zinc acetylacetonate-doped PDINO, which uses zinc acetylacetonate-doped PDINO as the electron transport layer, improving the conductivity and tuning level of PDINO, thereby increasing the open-circuit voltage, short-circuit current density, and fill factor of the device, resulting in superior device performance. Furthermore, the optimized device energy conversion efficiency is insensitive to changes in the electron transport layer thickness, which is beneficial for realizing large-area, high-efficiency devices.

[0006] One object of the present invention is to provide an organic solar cell based on zinc acetylacetonate doped PDINO, wherein the structure of the organic solar cell, from bottom to top, comprises: a glass substrate, an anode, a hole transport layer, a photoactive layer, an electron transport layer, and a cathode;

[0007] in,

[0008] The electron transport layer comprises the main component PDINO (3,3'-(1,3,8,10-tetraanthrone[2,1,9-DEF:6,5,10-D'E'F']diisoquinoline-2,9(1H,3H,8H,10H)-diyl)bis(N,N-dimethylpropane-1-amine oxide)) and the dopant component zinc acetylacetonate (ZAA);

[0009] The zinc acetylacetone comprises 5-50 wt% of the electron transport layer.

[0010] Furthermore, the thickness of the electron transport layer is 10-70 nm.

[0011] In the electron transport layer, PDINO doping with ZAA produces a synergistic effect, which greatly improves the contact between the electron transport layer, the photoactive layer, and the metal electrode. It can better regulate the balance of hole and electron transport, reduce molecular recombination, and improve the conductivity of the electron transport layer, thereby further improving the transport of charge carriers in the device and enabling the device to obtain superior performance. At the same time, PDINO doping with ZAA also effectively reduces the problem of significant decrease in short-circuit current density and fill factor caused by the increase in electron transport layer thickness, showing good application prospects.

[0012] Furthermore, in the photoactive layer, the donor material is selected from a p-type organic semiconductor based on specific unit 1, and the acceptor material is selected from an n-type organic semiconductor based on specific unit 2; wherein, specific unit 1 is selected from one or more of the following structures:

[0013]

[0014] The specific unit 2 is selected from one or more of the following structures:

[0015]

[0016] Wherein, R1-R6 are independently selected from alkyl groups having 1-40 carbon atoms, or alkyl derivatives having 1-40 carbon atoms;

[0017] One or more carbon atoms on the alkyl derivative are replaced by one or more of hydrogen atoms, oxygen atoms, alkenyl, alkynyl, aryl, hydroxyl, amino, carbonyl, carboxyl, ester, cyano, and nitro groups;

[0018] And / or,

[0019] One or more hydrogen atoms on the alkyl derivative are replaced by one or more of fluorine, chlorine, bromine, and iodine atoms;

[0020] X1-X6 are independently selected from one or more of hydrogen atom, fluorine atom, chlorine atom, cyano group, and nitro group;

[0021] The thickness of the photoactive layer is 60-150 nm.

[0022] Preferably, in the photoactive layer, the donor is selected from poly[5-thioethylhexyl-4-methyl-benzo[1,2-b:4,5-b]dithiophene (BDT)-thiophene[3,4-c]pyridine-4,6(5H)-dione (TPD)-octylthiophene[3,2-b]thiophene (tt-TPD)] (PMT50) and poly[5-ethylhexyl-benzo[1,2-b:4,5-b]dithiophene (BDT)-thiophene[3,4-c]pyridine-4,6(5H)-dione (TPD)-octylthiophene[3,4-b] (Tt-TPD) (PMT50). [2-b]Thiophene (tt-TPD)](PTh37); the acceptor is 12,13-bis(2-ethylhexyl)-3,9-diundecyl-12,13-dihydro-[1,2,5]thiadiazo[3,4-e]thieno[2”,3”:4',5']thieno[2',3':4,5]pyrrolo[3,2-g]thieno[2',3':4,5]thieno[3,2-b]indol-2,10-bis(5,6-difluoro-3-(dicyanomethylene)indone (Y6).

[0023] The structural formulas of PMT50, PTh37, and Y6 are shown below:

[0024]

[0025] Furthermore, the photoactive layer is preferably a mixture of the polymer donor PMT50 and the small molecule acceptor Y6.

[0026] Furthermore, the material of the hole transport layer is selected from organic compound 1, inorganic compound 1, or a combination thereof;

[0027] Wherein, the organic compound 1 is selected from one or more of 4,4'-cyclohexylbis[N,N'-di(4-methylphenyl)aniline], N,N'-bis(naphthyl-1-yl)-N,N'-bis(phenyl)-benzidine, N,N'-bis(naphthyl-1-yl)-N,N'-bis(phenyl)-2,7-diamino9,9-spirodifluorene, 2,2',7,7'-tetra[N,N-di(4-methoxyphenyl)amino]-9,9'-spirodifluorene, 4,4',4"-tris(carbazole-9-yl)triphenylamine, poly(4-butyltriphenylamine), polyvinylcarbazole, polystyrene-N,N'-diphenyl-N,N'-bis-(3-methylphenyl)-(1,1)-biphenyl-4,4'-diamine perfluorocyclobutane, and poly(3,4-ethylenedioxythiophene) mixed polystyrene sulfonate;

[0028] The inorganic compound 1 is selected from tungsten oxide, molybdenum oxide, vanadium oxide, chromium oxide, nickel oxide, copper oxide, cuprous oxide, cuprous thiocyanate, copper sulfide, copper iodide, cuprous iodide, or a mixture or compound of the above materials.

[0029] The thickness of the hole transport layer is 10-30 nm.

[0030] Furthermore, the hole transport layer is preferably a poly(3,4-ethylenedioxythiophene) mixed polystyrene sulfonate (PEDOT:PSS).

[0031] Furthermore, the anode is an indium tin oxide (ITO) thin film electrode with a thickness of 130-200 nm; the cathode is selected from either an Ag electrode or an Al electrode with a thickness of 100-150 nm.

[0032] Another object of the present invention is to provide a method for preparing the above-mentioned organic solar cell based on zinc acetylacetone-doped PDINO, comprising the following steps:

[0033] S1. A hole transport layer material dispersion is spin-coated onto the anode surface to obtain a hole transport layer;

[0034] S2. Spin-coat a dispersion of photoactive layer material onto the surface of the hole transport layer to obtain a photoactive layer;

[0035] S3. Spin-coat an electron transport layer material dispersion onto the surface of the photoactive layer to obtain an electron transport layer;

[0036] S4. Under vacuum conditions, a metal cathode material is deposited on the surface of the electron transport layer to obtain a metal electrode.

[0037] Furthermore, step S1 also includes pretreatment of the anode, which includes cleaning, drying, and UVO treatment.

[0038] Further, in step S1, the concentration of the hole transport layer material dispersion is 1.1-1.3 mg / ml. -1 .

[0039] Furthermore, step S1 also includes annealing the hole transport layer at a temperature of 120-170°C for 15-20 minutes.

[0040] Further, in step S2, the concentration of the photoactive layer material dispersion is 16-20 mg / ml. -1 .

[0041] Furthermore, step S2 also includes annealing the photoactive layer at a temperature of 90-110°C for 5-15 minutes.

[0042] Further, in step S2, the mass ratio of donor to acceptor in the photoactive layer is 1:(1.1-1.5).

[0043] Further, in step S3, the concentration of the electron transport layer material dispersion is 1-10 mg / ml. -1 .

[0044] Further, in step S3, the vacuum condition is 1×10⁻⁶. -6 -5×10 -6 Pa.

[0045] The present invention has the following beneficial effects:

[0046] 1. This invention improves the contact between the electron transport layer and the photoactive layer and metal electrode by doping ZAA in a PDINO solution to prepare an electron transport layer. The doped PDINO interface layer can better regulate the hole and electron transport balance in the device, reduce molecular recombination, and effectively improve the device efficiency.

[0047] 2. Compared to undoped PDINO, the ZAA-doped PDINO interface layer in this invention exhibits higher conductivity, making it more suitable for fabricating OSCs based on thick electron transport layers. Devices containing only a PDINO electron transport layer show a significant decrease in short-circuit current density and fill factor when the PDINO layer is thick. However, ZAA-doped PDINO devices still maintain high short-circuit current density and fill factor even with a thick electron transport layer, demonstrating insensitivity to the thickness of the electron transport layer. This solves the problem of the rapid performance degradation of PDINO-based OSCs with increasing electron transport layer thickness. Attached Figure Description

[0048] Figure 1The diagram shows the structure of the organic solar cell based on zinc acetylacetonate doped PDINO, as well as schematic diagrams of ZAA and PDINO.

[0049] Figure 2 The electron transport layer topography diagrams of embodiments and comparative examples of the present invention are shown;

[0050] in,

[0051] Figure 2 (a) is a topographic image of the electron transport layer in Comparative Example 1;

[0052] Figure 2 (b) is a topographic diagram of the electron transport layer in Example 1;

[0053] Figure 2 (c) is a topographic image of the electron transport layer in Comparative Example 2.

[0054] Figure 3 The absorption spectrum test results of Test Example 1 are shown.

[0055] Figure 4 The diagram showing the energy level test results in Test Example 1 is illustrated.

[0056] Figure 5 The conductivity test results for Test Example 1 are shown in the figure.

[0057] Figure 6 The test results for device JV and EQE in Test Example 1 are shown;

[0058] in,

[0059] Figure 6 (a) is the open-circuit voltage-short-circuit current density curve;

[0060] Figure 6 (b) is the wavelength-EQE curve.

[0061] Figure 7 The performance test results of organic solar cells with different electron transport layer thicknesses are shown in Test Example 2;

[0062] in,

[0063] Figure 7 (a) shows the thickness-open-circuit voltage curve;

[0064] Figure 7 (b) shows the thickness-short-circuit current density curve;

[0065] Figure 7 (c) shows the thickness-fill factor curve;

[0066] Figure 7(d) shows the thickness-energy conversion efficiency curve. Detailed Implementation

[0067] To more clearly illustrate the technical solution of the present invention, the following embodiments are provided. Unless otherwise stated, the raw materials, reactions, and post-processing methods appearing in the embodiments are all commercially available raw materials and technical methods well known to those skilled in the art.

[0068] The terms "preferred," "more preferably," and "more suitable" used in this invention refer to embodiments of the invention that provide certain beneficial effects under certain circumstances. However, other embodiments may also be preferred under the same or other circumstances. Furthermore, the description of one or more preferred embodiments does not imply that other embodiments are unavailable, nor is it intended to exclude other embodiments from the scope of this invention.

[0069] It should be understood that, except in any operational instance or otherwise indicated, all figures representing the amounts of ingredients used, for example, in the specification and claims, should be understood to be modified in all cases by the term "about". Therefore, unless otherwise stated, the numerical parameters set forth in the following specification and appended claims are approximations varying with the desired performance to be obtained according to the invention.

[0070] Example 1

[0071] An organic solar cell based on zinc acetylacetonate doped PDINO, wherein the structure of the organic solar cell, from bottom to top, is as follows: glass substrate (700 μm) / ITO (200 nm) / PEDOT:PSS (20 nm) / PMT50:Y6 (1:1.2, m / m) (90 nm) / zinc acetylacetonate:PDINO (5:95, m / m) (10 nm) / silver electrode (110 nm);

[0072] The above-mentioned method for preparing a solar cell based on zinc acetylacetone-doped PDINO includes the following steps:

[0073] S1. The ITO substrate was ultrasonically cleaned sequentially with detergent, ultrapure water, acetone and isopropanol for 15 minutes each time, and then dried in an oven at 80°C.

[0074] The ITO substrate was subjected to UVO treatment for 15 min, and then a PEDOT:PSS dispersion (concentration 1.1 mg / ml) was spin-coated onto the surface. -1 A hole transport layer with a thickness of 20 nm was obtained.

[0075] S2. The polymer donor PMT50 and the small molecule acceptor Y6 were mixed and dissolved in chloroform solution at a mass ratio of 1:1.2, and a 0.5% (v / v) chloronaphthalene solution was added. After stirring for 6 hours, a concentration of 18 mg / ml was obtained. -1 Photoactive layer material dispersion;

[0076] The photoactive layer material dispersion was spin-coated onto the surface of the hole transport layer and annealed at 110°C, followed by a vacuum treatment at a degree below 1×10⁻⁶. -4 After being placed overnight under Pa conditions, a photoactive layer with a thickness of 90 nm was obtained.

[0077] S3. Prepare a solution with a concentration of 1 mg / ml. -1 A zinc acetylacetone solution was doped at a concentration of 1 mg / ml at a ratio of 5 wt%. -1 In a PDINO solution, an electron transport layer material dispersion was obtained;

[0078] The electron transport layer material dispersion was spin-coated onto the surface of the photoactive layer to obtain an electron transport layer with a thickness of 10 nm.

[0079] S4. In the vacuum evaporation chamber, the vacuum degree is 1×10⁻⁶. -6 Under the condition of Pa, metallic Ag is vapor-deposited on the surface of the electron transport layer to obtain a metal electrode with a thickness of 110 nm.

[0080] Figure 1 The diagram shows the structure of the organic solar cell of the present invention, as well as schematic diagrams of the structures of ZAA and PDINO.

[0081] Figure 2 (b) shows a topographic image of the electron transport layer in Example 1, which shows that the R of the PDINO+ZAA thin film... RMS It is 1.14nm.

[0082] Example 2

[0083] An organic solar cell based on zinc acetylacetonate doped PDINO, wherein the structure of the organic solar cell, from bottom to top, is as follows: glass substrate (700 μm) / ITO (130 nm) / PEDOT:PSS (30 nm) / PTh37:Y6 (1:1.5, m / m) (130 nm) / zinc acetylacetonate:PDINO (40:60, m / m) (70 nm) / silver electrode (110 nm);

[0084] The above-mentioned method for preparing a solar cell based on zinc acetylacetone-doped PDINO includes the following steps:

[0085] S1. The ITO substrate was ultrasonically cleaned sequentially with detergent, ultrapure water, acetone and isopropanol for 15 minutes each time, and then dried in an oven at 80°C.

[0086] The ITO substrate was subjected to UVO treatment for 15 min, and then a PEDOT:PSS dispersion (concentration 1.3 mg / ml) was spin-coated onto the surface. -1 A hole transport layer with a thickness of 30 nm was obtained.

[0087] S2. The polymer donor PTh37 and the small molecule acceptor Y6 were mixed and dissolved in chloroform solution at a mass ratio of 1:1.5, and a 0.5% (v / v) chloronaphthalene solution was added. After stirring for 6 hours, a solution with a concentration of 20 mg / ml was obtained. -1 Photoactive layer material dispersion;

[0088] The photoactive layer material dispersion was spin-coated onto the surface of the hole transport layer and annealed at 100°C, followed by a vacuum treatment at a degree below 1×10⁻⁶. -4 After being placed overnight under Pa conditions, a photoactive layer with a thickness of 130 nm was obtained.

[0089] S3. Prepare a solution with a concentration of 3 mg / ml. -1 A zinc acetylacetone solution was doped at a concentration of 3 mg / ml at a ratio of 40 wt%. -1 In a PDINO solution, an electron transport layer material dispersion was obtained;

[0090] The electron transport layer material dispersion was spin-coated onto the surface of the photoactive layer to obtain an electron transport layer with a thickness of 70 nm.

[0091] S4. In the vacuum evaporation chamber, the vacuum degree is 5×10 -6 Under the condition of Pa, metallic Ag is vapor-deposited on the surface of the electron transport layer to obtain a metal electrode with a thickness of 110 nm.

[0092] Comparative Example 1

[0093] An organic solar cell, the difference between this comparative example and Example 1 is that: this comparative example uses PDINO as the electron transport layer; step S3 is replaced by: using a concentration of 1 mg / ml -1 The PDINO solution was spin-coated onto the surface of the photoactive layer to obtain an electron transport layer with a thickness of 10 nm; other structures and preparation methods were the same as in Example 1.

[0094] Figure 2 (a) shows the morphology of the electron transport layer in Comparative Example 1, which reveals the R of the PDINO thin film. RMS It is 1.05nm.

[0095] Comparative Example 2

[0096] An organic solar cell, the difference between this comparative example and Example 1 is that: this comparative example uses zinc acetylacetonate as the electron transport layer; step S3 is replaced by: using zinc acetylacetonate at a concentration of 0.5 mg / ml. -1 A zinc acetylacetone solution was spin-coated onto the surface of the photoactive layer to obtain an electron transport layer with a thickness of 5 nm; other structures and preparation methods were the same as in Example 1.

[0097] Figure 2 (c) shows the morphology of the electron transport layer in Comparative Example 2, which reveals the R of the ZAA thin film. RMS It is 1.63nm.

[0098] Test Example 1

[0099] The organic solar cells prepared in Example 1, Comparative Example 1, and Comparative Example 2 were subjected to performance tests.

[0100] Test method:

[0101] Under the AM1.5G spectrum (100mW cm⁻¹) -2 The absorption spectrum, energy level, conductivity, and energy conversion efficiency of the organic solar cells prepared in Example 1, Comparative Example 1, and Comparative Example 2 were tested. The effective area of ​​the test devices was 0.045 cm² in all cases. 2 .

[0102] Test results:

[0103] Figure 3 The absorption spectrum test results of Example 1, Comparative Example 1, and Comparative Example 2 are shown.

[0104] according to Figure 3 It can be concluded that the main absorption range of PDINO is 400-600nm. The absorption spectrum of the doped PDINO+ZAA electron transport layer is basically the same as that of PDINO. ZAA has almost no absorption in the visible light range.

[0105] Figure 4 The energy level test results of Example 1, Comparative Example 1, and Comparative Example 2 are shown in the figure.

[0106] according to Figure 4 It can be concluded that, compared with PDINO, the doped PDINO+ZAA electron transport layer has a lower energy level.

[0107] Figure 5 The conductivity test results of Example 1, Comparative Example 1, and Comparative Example 2 are shown in the figure.

[0108] according to Figure 5It can be concluded that the conductivity of PDINO is 4.98 × 10⁻⁶. -6 S cm -1 The conductivity of PDINO+ZAA is 1.08 × 10⁻⁶. -5 S cm -1 Compared to PDINO, the doped PDINO+ZAA electron transport layer has higher conductivity, which is more conducive to carrier transport.

[0109] Figure 6 The JV and EQE test results of the devices in Example 1, Comparative Example 1, and Comparative Example 2 are shown.

[0110] Table 1 shows the JV test results for Example 1, Comparative Example 1, and Comparative Example 2.

[0111] Table 1. JV test results of Example 1, Comparative Example 1, and Comparative Example 2

[0112]

[0113] according to Figure 6 As shown in Table 1, compared with Comparative Examples 1 and 2, the device in Example 1 has a power conversion efficiency of 15.94%, an open-circuit voltage of 0.836V, and a short-circuit current density of 26.57mA / cm². -2 With a fill factor of 71.7%, it exhibits better open-circuit voltage, short-circuit current density, and fill factor, resulting in the highest energy conversion efficiency. This indicates that ZAA doping with PDINO produces a synergistic effect, improving the conductivity of the electron transport layer and modulating the energy level. Its performance is significantly improved compared to structures containing only PDINO or ZAA, thereby enhancing the energy conversion efficiency of organic solar cells.

[0114] Test Example 2

[0115] The effect of different electron transport layer thicknesses on device performance was tested in the organic solar cells prepared in Example 1 and Comparative Examples 1-2.

[0116] Test method: Under AM1.5G spectrum (100mW cm⁻¹) -2 The open-circuit voltage, short-circuit current density, fill factor, and power conversion efficiency of the organic solar cells prepared in Example 1 and Comparative Examples 1-2 were tested. The electron transport layer thickness in Example 1 varied from 10 to 70 nm, the electron transport layer thickness in Test Example 1 varied from 10 to 70 nm, and the electron transport layer thickness in Test Example 2 varied from 5 to 50 nm. The effective area of ​​the tested devices was 0.045 cm² in all cases. 2 .

[0117] Test results:

[0118] Figure 7 The open-circuit voltage, short-circuit current density, fill factor, and power conversion efficiency of organic solar cells with different electron transport layer thicknesses are shown.

[0119] in,

[0120] Figure 7 (a) shows the thickness-open-circuit voltage curve;

[0121] Figure 7 (b) shows the thickness-short-circuit current density curve;

[0122] Figure 7 (c) shows the thickness-fill factor curve;

[0123] Figure 7 (d) shows the thickness-energy conversion efficiency curve.

[0124] according to Figure 7 It can be concluded that the organic solar cell based on zinc acetylacetonate-doped PDINO of the present invention, with an electron transport layer thickness between 10-70 nm, has a power conversion efficiency of 13.03-15.94%, an open-circuit voltage of 0.824-0.836 V, and a short-circuit current density of 23.82-26.57 mA / cm². -2 The fill factor was 66.3-71.7%, and compared to the optimal performance, the device performance only decreased by 18.30% when the thickness increased to 70 nm. Comparative Example 1, with its PDINO electron transport layer organic solar cell, exhibited a power conversion efficiency of 10.63-14.43%, an open-circuit voltage of 0.841-0.832 V, and a short-circuit current density of 22.21-26.11 mA / cm² when the electron transport layer thickness was between 10-70 nm. -2 The fill factor was 58.2-67.0%. Compared to the optimal performance, the device performance decreased by 26.30% when the thickness increased to 70 nm. In Comparative Example 2, the ZAA electron transport layer organic solar cell showed a significant decrease in energy conversion efficiency when the electron transport layer thickness was between 5-50 nm, indicating that the device performance was highly sensitive to the electron transport layer thickness. In the large-scale fabrication of high-performance OSCs, a thicker electron transport layer is more advantageous for achieving a high-quality, pore-free electron transport layer film during high-speed processing, ensuring excellent device performance. Therefore, compared to the comparative example, the energy conversion efficiency of the device in this embodiment is less sensitive to the electron transport layer thickness, making it more suitable for future roll-to-roll printing fabrication of high-performance OSCs and showing promising application prospects.

[0125] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from the spirit or essential characteristics of the invention. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within the present invention.

[0126] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. An organic solar cell based on zinc acetylacetone-doped PDINO, characterized in that, The structure of the organic solar cell based on zinc acetylacetone doped PDINO includes, from bottom to top: a glass substrate, an anode, a hole transport layer, a photoactive layer, an electron transport layer, and a cathode; in, The electron transport layer includes the main component PDINO and the dopant component zinc acetylacetonate; The zinc acetylacetone comprises 5-50 wt% of the electron transport layer.

2. The organic solar cell based on zinc acetylacetonate-doped PDINO according to claim 1, characterized in that, The thickness of the electron transport layer is 10-70 nm.

3. The organic solar cell based on zinc acetylacetonate doped PDINO according to claim 1, characterized in that, In the photoactive layer, the donor material is selected from a p-type organic semiconductor based on a specific unit 1, and the acceptor material is selected from an n-type organic semiconductor based on a specific unit 2; wherein, the specific unit 1 is selected from one or more of the following structures: The specific unit 2 is selected from one or more of the following structures: Wherein, R1-R6 are independently selected from alkyl groups having 1-40 carbon atoms, or alkyl derivatives having 1-40 carbon atoms; One or more carbon atoms on the alkyl derivative are replaced by one or more of hydrogen atoms, oxygen atoms, alkenyl, alkynyl, aryl, hydroxyl, amino, carbonyl, carboxyl, ester, cyano, and nitro groups; And / or, One or more hydrogen atoms on the alkyl derivative are replaced by one or more of fluorine, chlorine, bromine, and iodine atoms; X1-X6 are independently selected from one or more of hydrogen atom, fluorine atom, chlorine atom, cyano group, and nitro group; The thickness of the photoactive layer is 60-150 nm.

4. The organic solar cell based on zinc acetylacetonate-doped PDINO according to claim 1, characterized in that, The material of the hole transport layer is selected from organic compound 1, inorganic compound 1, or a combination thereof; Wherein, the organic compound 1 is selected from one or more of 4,4'-cyclohexylbis[N,N'-di(4-methylphenyl)aniline], N,N'-bis(naphthyl-1-yl)-N,N'-bis(phenyl)-benzidine, N,N'-bis(naphthyl-1-yl)-N,N'-bis(phenyl)-2,7-diamino9,9-spirodifluorene, 2,2',7,7'-tetra[N,N-di(4-methoxyphenyl)amino]-9,9'-spirodifluorene, 4,4',4"-tris(carbazole-9-yl)triphenylamine, poly(4-butyltriphenylamine), polyvinylcarbazole, polystyrene-N,N'-diphenyl-N,N'-bis-(3-methylphenyl)-(1,1)-biphenyl-4,4'-diamine perfluorocyclobutane, and poly(3,4-ethylenedioxythiophene) mixed polystyrene sulfonate; The inorganic compound 1 is selected from tungsten oxide, molybdenum oxide, vanadium oxide, chromium oxide, nickel oxide, copper oxide, cuprous oxide, cuprous thiocyanate, copper sulfide, copper iodide, cuprous iodide, or a mixture or compound of the above materials. The thickness of the hole transport layer is 10-30 nm.

5. The organic solar cell based on zinc acetylacetone-doped PDINO according to claim 1, characterized in that, The anode is an indium tin oxide thin film electrode with a thickness of 130-200 nm; the cathode is selected from either an Ag electrode or an Al electrode with a thickness of 100-150 nm.

6. The method for preparing an organic solar cell based on zinc acetylacetone-doped PDINO according to any one of claims 1-5, characterized in that, The method for fabricating the organic solar cell based on zinc acetylacetone-doped PDINO includes the following steps: S1. A hole transport layer material dispersion is spin-coated onto the anode surface to obtain a hole transport layer; S2. Spin-coat a dispersion of photoactive layer material onto the surface of the hole transport layer to obtain a photoactive layer; S3. Spin-coat an electron transport layer material dispersion onto the surface of the photoactive layer to obtain an electron transport layer; S4. Under vacuum conditions, a metal cathode material is deposited on the surface of the electron transport layer to obtain a metal electrode.

7. The method for preparing an organic solar cell based on zinc acetylacetone-doped PDINO according to claim 6, characterized in that, In step S1, the concentration of the hole transport layer material dispersion is 1.1-1.3 mg / ml. -1 .

8. The method for preparing an organic solar cell based on zinc acetylacetone-doped PDINO according to claim 6, characterized in that, In step S2, the concentration of the photoactive layer material dispersion is 16-20 mg / ml. -1 .

9. The method for preparing an organic solar cell based on zinc acetylacetone-doped PDINO according to claim 6, characterized in that, In step S2, the mass ratio of donor to acceptor in the photoactive layer is 1:(1.1-1.5).

10. The method for preparing an organic solar cell based on zinc acetylacetone-doped PDINO according to claim 6, characterized in that, In step S3, the concentration of the electron transport layer material dispersion is 1-10 mg / ml. -1 .

Images