Self-assembly transmission layer solution, non-fullerene organic solar cell and preparation method of non-fullerene organic solar cell

Abstract

The invention relates to the technical field of solar cells, in particular to a self-assembly transport layer solution, a non-fullerene organic solar cell and a preparation method of the non-fullerene organic solar cell, the self-assembly transport layer solution comprises a solute, a solvent and a solvent additive, the solute is [4-(3, 6-diphenyl-9H-carbazole-9-yl) butyl] phosphoric acid (Ph-4PACz), the solvent is ethanol, the solvent additive is dibutyl ether (DBtE), and the concentration of the self-assembly transmission layer solution is 0.3 mg / mL. When the solution is coated on the surface of an electrode (such as an ITO (Indium Tin Oxide) electrode or other suitable electrode materials), Ph-4PACz molecules can form an ordered monomolecular layer. These molecular layers contribute to optimizing charge injection, in particular hole injection, thereby functioning as a hole transport layer (HTL) in organic solar cells. The solution method is simple in preparation and has greater potential in the aspect of large-scale preparation.

Description

Technical Field

[0001] The invention relates to the technical field of solar cells, and in particular to a self-assembled transport layer solution, a non-fullerene organic solar cell and a preparation method thereof. Background Art

[0002] Solar cells have become one of the important research directions for adjusting the energy structure system worldwide due to their green and environmentally friendly characteristics. Organic solar cells stand out among many solar cells due to their advantages such as simple device process, wide material sources, low-temperature operation, and preparation on flexible substrates. The most widely studied organic solar cell (OSC) structure is the bulk heterojunction solar cell. In recent years, thanks to many means such as new material design, device structure optimization, and interface engineering, the power conversion efficiency (PCE) of bulk heterojunction organic solar cells has been rapidly improved, and has now exceeded 20%. According to relevant research results, the battery life can reach more than 10 years. These studies all show that organic solar cells are a type of battery with broad application prospects. It is worth noting that currently high-efficiency organic solar cells are based on small-area thin film preparation methods at the laboratory level, such as spin coating. However, this process is not suitable for large-area substrates, is difficult to be compatible with industrial production, and requires a large amount of material loss, which makes it impossible to use it in actual industrialization. To solve this problem, in recent years, domestic and foreign research groups have developed large-area solution preparation methods suitable for industrial production, such as inkjet printing, blade coating, and slit coating. Among them, the scraping method is compatible with large-area roll-to-roll processes, and is simple to operate and has a low material waste rate. It is one of the most economical and reliable processing methods for achieving large-area, commercial preparation of organic solar cells.

[0003] The information disclosed in this background technology section is only intended to deepen the understanding of the overall background technology of the present invention, and should not be regarded as acknowledging or suggesting in any form that the information constitutes the prior art known to those skilled in the art. Summary of the invention

[0004] The technical problem to be solved by the present invention is to provide a self-assembled transport layer solution and use the self-assembled transport layer solution to prepare a non-fullerene organic solar cell, based on dibutyl ether as a solvent additive added to the self-assembled transport layer solution, and use a spin coating method to prepare a high-quality hole transport layer film. The solution method is simple to prepare and has greater potential in large-scale preparation.

[0005] In order to achieve the above object, the technical solution adopted by the present invention is:

[0006] A self-assembled transport layer solution includes a solute, a solvent and a solvent additive, wherein the solute is [4-(3,6-diphenyl-9H-carbazole-9-yl)butyl]phosphoric acid (Ph-4PACz), the solvent is ethanol, and the solvent additive is dibutyl ether (DBtE). In the self-assembled transport layer solution, the concentration of the solute in the solvent is 0.3 mg / mL. When the solution is coated on an electrode surface (such as an ITO electrode or other suitable electrode materials), Ph-4PACz molecules form an ordered monolayer. These molecular layers help optimize charge injection, especially hole injection, thereby playing the role of a hole transport layer (HTL) in an organic solar cell.

[0007] The structural formulas of the solute and solvent additives are shown below:

[0008]

[0009] As a solvent additive, DBtE can improve the solubility of Ph-4PACz in ethanol and help form a uniform solution. During the dissolution process, DBtE can reduce the viscosity of the solution, making Ph-4PACz easier to dissolve and maintain a uniform dispersion state, and promoting their self-assembly arrangement during the drying process.

[0010] The concentration of Ph-4PACz solution and the amount of DBtE added have an important influence on the self-assembly effect. Too high a concentration may lead to too dense stacking between molecules, affecting the uniformity of self-assembly; too low a concentration may lead to a weak or incomplete self-assembled layer. Appropriate DBtE concentration helps to improve the stability of the solution and the interaction between molecules. The solution concentration (0.3 mg / mL) and the amount of DBtE added (0.5%) help to form a uniform self-assembled layer and optimize the interface quality.

[0011] A method for preparing a self-assembled transmission layer solution comprises: mixing a solute and a solvent in a glove box, adding 0.5% by volume of dibutyl ether as a solvent additive, and then dissolving on a heating platform for 2 hours to obtain a self-assembled transmission layer solution.

[0012] By heating the solution on a heating table for 2 hours, it can be ensured that Ph-4PACz is completely dissolved and forms a stable solution. Heating can accelerate the dissolution process and help maintain the uniformity of the solution under temperature control conditions, avoiding uneven dissolution and precipitation formation. The present invention uses a concentration of 0.3 mg / mL to prepare the solution, so that the transport layer can obtain good thickness control during the preparation process, thereby avoiding too thick or too thin film layers and ensuring the optimal performance of the hole transport layer.

[0013] Furthermore, a non-fullerene organic solar cell with a self-assembled transport layer comprises an anode, a hole transport layer, a photoactive layer, an electron transport layer and a cathode stacked in sequence; the thickness of each layer is 100-200nm, 5-20nm, 100-200nm, 10-30nm, and 100-200nm, respectively.

[0014] The hole transport layer is prepared by spin coating the anode surface using the self-assembled transport layer solution. The self-assembled transport layer solution can adjust and optimize the energy level alignment between the hole transport layer and the non-fullerene photoactive layer, reduce energy loss, promote efficient migration of holes from the photoactive layer to the hole transport layer, and effectively avoid charge recombination. Through orderly self-assembly arrangement and suitable molecular structure, the hole transport layer can effectively transport holes to the electrode without introducing unnecessary recombination phenomena.

[0015] Preferably, the hole transport layer has a thickness of 5 to 10 nm, which can ensure that the hole transport layer is in full contact with the photoactive layer at the interface without causing excessive resistance, thereby providing efficient hole transport and avoiding excessive energy loss.

[0016] Further preferably, the photoactive layer is prepared by a blended solution, the solute of the blended solution is a polymer donor PM6 and a non-fullerene electron acceptor BTP-ec9, and the solvent is chlorobenzene. Chlorobenzene as a solvent performs well in terms of the dispersibility of BTP-ec9 and the structural formation of the photoactive layer. BTP-ec9, as a non-fullerene electron acceptor, has good electron acceptance ability and a lower energy band structure, and can effectively receive electrons on the basis of PM6 to form a relatively stable electron-acceptor pair. Through blending, PM6 and BTP-ec9 will form a suitable phase separation structure in the photoactive layer, enhancing the separation efficiency of photogenerated carriers.

[0017] The relevant donor and acceptor molecular formulas are:

[0018]

[0019] Furthermore, the method for preparing the above-mentioned non-fullerene organic solar cell with a self-assembled transport layer comprises the following steps:

[0020] S1 provides a conductive substrate as an anode, prepares a self-assembled transport layer solution, and spin-coats the self-assembled transport layer solution on the conductive substrate to form a hole transport layer on the surface of the conductive substrate;

[0021] By spin coating the self-assembled transport layer solution on the anode surface, a uniform monolayer can be formed. The self-assembly process gives the hole transport layer a highly ordered structure, which helps to optimize hole injection and transport and reduce charge recombination.

[0022] Preferably, in step S1, the rotation speed of the spin coating is 3000-4000 rpm. This rotation speed range can effectively control the thickness of the film, avoid the film layer being too thick or too thin, and thus optimize the hole transport efficiency.

[0023] Preferably, in step S1, the conductive substrate is an ITO / glass substrate. The surface of the ITO / glass substrate has good surface energy, which can enhance the adhesion of the self-assembled transport layer molecules and promote the formation of a uniform coating.

[0024] S2 prepares a photoactive layer blend solution, and spin-coats the blend solution on the surface of the hole transport layer to form a photoactive layer; during the spin coating process, PM6 and BTP-ec9 form a uniform heterojunction structure (DA structure) with optimized nanoscale phase separation, which helps to improve the separation efficiency and migration rate of photogenerated carriers.

[0025] Preferably, in step S2, the preparation method of the blend solution is: mixing the solute and the solvent in a glove box, and stirring the blend solution at 100°C for 20 minutes; the concentration of the blend solution is 23 mg / mL. Stirring at 100°C can effectively improve the solubility of the solute. It helps the interaction between the solvent molecules and the solute molecules, thereby accelerating the dissolution process, so that the solute in the solution is completely dissolved and evenly dispersed.

[0026] S3 prepares an electron transport layer material solution, and spin-coats the electron transport layer material solution on the photoactive layer to form an electron transport layer on the surface of the photoactive layer;

[0027] The electron transport layer uses PCBM, TiO2 or other high-mobility materials to efficiently accept the electrons generated by the photoactive layer and transfer them to the cathode. During the spin coating process, the electron transport layer material solution can evenly cover the photoactive layer to form a stable electron transport channel, ensuring that electrons efficiently migrate from the photoactive layer to the cathode.

[0028] S4 forms a cathode on the surface of the electron transport layer.

[0029] The function of the cathode is to extract photogenerated electrons and transport them to the external circuit. Preferably, in step S4, the cathode is any one of a carbon electrode, a silver electrode, and an aluminum electrode, and the thickness of the cathode is 100 to 200 nm. An efficient electron extraction layer can be formed to ensure that electrons can be effectively transferred from the electron transport layer to the electrode and flow out of the battery.

[0030] The beneficial effects of the present invention are:

[0031] The present invention uses a reasonable spin coating process to ensure that the layers are well matched and the interaction between the different layers is optimized. The thickness and quality of each layer can be precisely controlled by the spin coating method, thereby ensuring the light absorption of the photoactive layer, the effective separation and transmission of holes and electrons, and the final charge extraction.

[0032] The present invention can form a highly ordered self-assembled monolayer (SAM) on a solid substrate by using Ph-4PACz as a solute. The self-assembled structure can improve the uniformity and interface quality of the transport layer, thereby improving the transmission efficiency of the holes. By using dibutyl ether (DBtE) as a solvent additive, the solubility of Ph-4PACz in ethanol can be improved to help form a uniform solution. Under a suitable solvent environment, Ph-4PACz molecules can be arranged in order on the surface through interactions such as π-π stacking effects and hydrogen bonds between molecules, forming a highly ordered layered structure, thereby optimizing the transmission of holes. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0034] Figure 1 is the molecular formula of Ph-4PACz and DBtE;

[0035] Figure 2 is the electrostatic potential distribution of Ph-4PACz and DBtE;

[0036] Figure 3 JV curves of different addition amounts of DBtE;

[0037] Figure 4 It is the O1s peak of XPS of Ph-4PACz and Ph-4PACz+DBtE;

[0038] Figure 5 AFM for Ph-4PACz and Ph-4PACz+DBtE;

[0039] Figure 6 Grazing-incidence X-ray scattering (GIWAXS) of Ph-4PACz and Ph-4PACz with added DBtE;

[0040] Figure 7 GIWAXS line profiles of Ph-4PACz and Ph-4PACz with added DBtE;

[0041] Figure 8 The UV photoelectron spectra of Ph-4PACz and Ph-4PACz+DBtE;

[0042] Fig. 9 is the transient photocurrent of Ph-4PACz and Ph-4PACz+DBtE;

[0043] Fig.10 is the transient photovoltage of Ph-4PACz and Ph-4PACz+DBtE;

[0044] Fig.11 JV curves of adding DBtE to different SAMs. DETAILED DESCRIPTION

[0045] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0046] It should be noted that when an element is referred to as being "fixed to" another element, it may be directly on the other element or there may be a central element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are for illustrative purposes only and do not represent the only implementation method.

[0047] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art of the present invention. The terms used in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "and / or" used herein includes any and all combinations of one or more related listed items.

[0048] Components Commercial sources Ph-4PACz Nanjing Zhiyan Optoelectronics Technology Co., Ltd. Ethanol Shanghai Titan Technology Co., Ltd. Bt Shanghai Titan Technology Co., Ltd. PM6 Dongguan Fuan Optoelectronics Technology Co., Ltd. BTP-ec9 Nanjing Zhiyan Optoelectronics Technology Co., Ltd. YD-2Cl TCI (Shanghai) Chemical Industry Development Co., Ltd. 4PADCB TCI (Shanghai) Chemical Industry Development Co., Ltd. 2PAC TCI (Shanghai) Chemical Industry Development Co., Ltd.

[0049] Example 1

[0050] A self-assembled transport layer solution includes a solute, a solvent and a solvent additive, wherein the solute is [4-(3,6-diphenyl-9H-carbazole-9-yl)butyl]phosphoric acid, the solvent is ethanol, the solvent additive is dibutyl ether, and the concentration of the self-assembled transport layer solution is 0.3 mg / mL. The specific preparation method is: mixing the solute and the solvent in a glove box, adding 0.5% volume fraction of dibutyl ether as a solvent additive, and then placing it on a heating table to dissolve for 2 hours to obtain a self-assembled transport layer solution.

[0051] A non-fullerene organic solar cell with a self-assembled transport layer comprises an anode, a hole transport layer, a photoactive layer, an electron transport layer and a cathode which are stacked in sequence; the thicknesses of the anode, the hole transport layer, the photoactive layer, the electron transport layer and the cathode are 100-200 nm, 5-20 nm, 100-200 nm, 10-30 nm and 100-200 nm, respectively.

[0052] Preferably, the photoactive layer is prepared by a blended solution, the solute of the blended solution is a polymer donor PM6 and a non-fullerene electron acceptor BTP-ec9, and the solvent is chlorobenzene. The preparation method of the blended solution is: mixing the solute and the solvent in a glove box, and stirring the blended solution at 100° C. for 20 minutes; the concentration of the blended solution is 23 mg / mL.

[0053] The method for preparing the above-mentioned non-fullerene organic solar cell with a self-assembled transport layer comprises the following steps:

[0054] S1 provides an ITO / glass substrate as an anode, prepares a self-assembled transport layer solution, and spin-coats the self-assembled transport layer solution on the ITO / glass substrate at a rotation speed of 3000-4000 rpm to form a hole transport layer on the surface of the ITO / glass substrate;

[0055] S2: preparing a photoactive layer blend solution, and spin coating the blend solution on the surface of the hole transport layer at a rotation speed of 3000-4000 rpm to form a photoactive layer;

[0056] S3: preparing an electron transport layer material solution, and spin coating the electron transport layer material solution on the photoactive layer at a rotation speed of 3000 rpm to form an electron transport layer on the surface of the photoactive layer;

[0057] S4: 100 nm Ag was evaporated on the surface of the electron transport layer to form a cathode.

[0058] Example 2

[0059] The difference between this embodiment and embodiment 1 is that the solute and the solvent are mixed in a glove box, 1% by volume of dibutyl ether is added as a solvent additive, and then the mixture is placed on a heating table to dissolve for 2 hours to obtain a self-assembled transport layer solution.

[0060] The rest will not be elaborated.

[0061] Example 3

[0062] The difference between this embodiment and embodiment 1 is that the solute and the solvent are mixed in a glove box, 2% by volume of dibutyl ether is added as a solvent additive, and then placed on a heating table to dissolve for 2 hours to prepare a self-assembled transport layer solution.

[0063] The rest will not be elaborated.

[0064] Comparative Example

[0065] The difference between this embodiment and embodiment 1 is that the solute and the solvent are mixed in a glove box and then placed on a heating table to dissolve for 2 hours to prepare a self-assembled transport layer solution.

[0066] The rest will not be elaborated.

[0067] Table 1 Specific parameters of different addition amounts of DBtE

[0068]

[0069]

[0070] Wherein, in Comparative Example 1, DBtE was not added relative to Example 1. Figure 1 Shown are the molecular formulas of Ph-4PACz and DBtE in the present invention, such as Figure 2 The electrostatic potential distribution of Ph-4PACz and DBtE is shown. It can be seen that the addition of DBtE can assist the self-assembly arrangement of SAM, and this effect mainly comes from the interaction between SAM and DBtE. SAM can form an ordered molecular layer on the surface through the self-assembly process, change the energy level structure of the surface, thereby improving the contact with other functional layers and enhancing the hole transmission capacity. Specifically, from the electrostatic potential diagram of SAM and DBtE, the negative ESP area of ​​SAM is mainly located on the O atom of the Ph-Cz core and the phosphate group, while the positive ESP area is mainly located on the alkyl chain between the two. For DBtE, the positive ESP area is located on the O atom, while the butyl chains on both sides show negative ESP.

[0071] Specific as Figure 3 The JV curves of different addition amounts of DBtE in Examples 1 to 3 and Comparative Example 1 are shown. It can be seen that at a dosage of 0.5% vol, the solubility of Ph-4PACz in ethanol can be improved, helping to form a uniform solution. Under a suitable solvent environment, Ph-4PACz molecules are arranged in an orderly manner, thereby optimizing the transmission of holes.

[0072] On this basis, the present invention is directed to the hole transport layer in Comparative Example 1 and Example 1; by fitting the O1s curve, the ratios of different types of oxygen of ITO to SAM and SAM+HOBT are summarized, such as Figure 4 As shown, the O1s peak of XPS of Ph-4PACz and Ph-4PACz+DBtE, the specific data are shown in Table 2 below:

[0073]

[0074] The O1s spectrum can be fitted with three characteristic peaks, which are located at 530.5Ev (from bulk oxygen [OⅠ] in the indium oxide lattice), 531.5eV (surface In-O-In / Sn-O [OⅡ]) and 532.9eV (surface PO-In, PO··In, surface In-OH [O III]). The increase in OIII indicates that the introduction of DBtE leads to more uniform adsorption of SAM.

[0075] Specific as Figures 5 to 10 As shown, the obvious reduction in the interlayer spacing can be seen from the GIWAXS characterization, indicating that the introduction of DBtE enables the SAM molecules to be arranged neatly and orderly, and therefore can be arranged more closely.

[0076] To further clarify the effect of DBtE addition on SAM coverage, we used grazing incidence wide-angle x-ray scattering (GIWAXS) technique. Figure 6 As shown, it can be observed that there are obvious layered stacking signals in the 100 direction both in the in-plane and out-of-plane directions. The line profile cutting of GIWAXS is further fitted, and the results are shown in Figure 7 As shown in Figure 2, the d-spacing is reduced in both the in-plane and out-of-plane directions. Reduce to In the out-of-plane direction, Reduce to This shows that through the introduction of DBtE and the help of arrangement, the SAM molecules on ITO are obviously more closely arranged, and this more closely arranged way can obtain better hole transport ability. Atomic force microscopy (AFM) was further used to observe the surface morphology of SAM and compare the effect of adding DBtE on the surface roughness of SAM film. The results are shown in Figure 2. Figure 5 As shown in the figure, after adding DBtE, it can be observed that, with its assistance, the SAM molecules are neatly and tightly arranged, which significantly reduces the roughness of the film surface, which is consistent with the GIWAXS results. Figure 8 ), it can be found that the introduction of DBtE can help modify and reduce the surface work function of SAM and further improve the carrier transport performance. According to the detection of transient photocurrent (TPC) and transient photovoltage (TPV) ( Fig. 9 , 10 ), it can be observed that the charge extraction speed is reduced from 0.386ms to 0.289ms, and the carrier lifetime of the DBtE device is 2.029μs, which is also a significant improvement compared to the 1.137μs of the control device.

[0077] Comparative Examples 2 to 7

[0078] The difference between Comparative Example 2 and Comparative Example 1 is that the solute and the solvent are mixed in a glove box, and the solute is YD-2Cl.

[0079] The difference between Comparative Example 3 and Example 1 is that the solute and the solvent are mixed in a glove box, and the solute is YD-2Cl.

[0080] The difference between Comparative Example 4 and Comparative Example 1 is that the solute and the solvent are mixed in a glove box, and the solute is 4PADCB.

[0081] The difference between Comparative Example 5 and Example 1 is that the solute and the solvent are mixed in a glove box, and the solute is 4PADCB.

[0082] The difference between Comparative Example 6 and Comparative Example 1 is that the solute and the solvent are mixed in a glove box, and the solute is 2PACz.

[0083] The difference between Comparative Example 7 and Example 1 is that the solute and the solvent are mixed in a glove box, and the solute is 2PACz.

[0084] Table 3 Specific parameters for adding DBtE in different SAMs

[0085]

[0086]

[0087] Specific as Fig.11 The JV curves of adding DBtE to different SAMs in Comparative Examples 2 to 7 are shown. It can be seen that when the solute is Ph-4PACz, the hole transport effect is the best.

[0088] Those skilled in the art should understand that the present invention is not limited to the above embodiments, and the above embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, and these changes and improvements fall within the scope of the present invention to be protected. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. A self-assembled transport layer solution, characterized in that: The invention comprises a solute, a solvent and a solvent additive, wherein the solute is [4-(3,6-diphenyl-9H-carbazole-9-yl)butyl]phosphoric acid, the solvent is ethanol, the solvent additive is dibutyl ether, and the concentration of the self-assembled transport layer solution is 0.3 mg / mL.

2. The method for preparing a self-assembled transport layer solution according to claim 1, characterized in that: include: The solute and the solvent were mixed in a glove box, and 0.5% by volume of dibutyl ether based on the volume of the solvent was added as a solvent additive, and then placed on a heating stage at 60° C. to dissolve for 2 h to prepare a self-assembled transport layer solution.

3. A non-fullerene organic solar cell, characterized in that: It includes an anode, a hole transport layer, a photoactive layer, an electron transport layer and a cathode which are stacked in sequence; Wherein, the hole transport layer is prepared by spin coating the self-assembled transport layer solution according to claim 1 on the surface of the anode.

4. A non-fullerene organic solar cell according to claim 3, characterized in that: The thicknesses of the anode, the hole transport layer, the photoactive layer, the electron transport layer and the cathode are respectively: 100-200 nm, 5-20 nm, 100-200 nm, 10-30 nm, 100-200 nm.

5. The non-fullerene organic solar cell according to claim 4, characterized in that: The hole transport layer has a thickness of 5-10 nm.

6. The non-fullerene organic solar cell according to claim 3, characterized in that: The photoactive layer is prepared by a mixed solution, the solute of the mixed solution is a polymer donor PM6 and a non-fullerene electron acceptor BTP-ec9, and the solvent is chlorobenzene.

7. The method for preparing a non-fullerene organic solar cell according to any one of claims 3 to 6, characterized in that: The method comprises: S1 provides a conductive substrate as an anode, prepares a self-assembled transport layer solution, and spin-coats the self-assembled transport layer solution on the conductive substrate to form a hole transport layer on the surface of the conductive substrate; S2 prepares a photoactive layer blend solution, and spin-coats the blend solution on the surface of the hole transport layer to form a photoactive layer; S3 preparing an electron transport layer material solution, and spin coating the electron transport layer material solution on the photoactive layer to form an electron transport layer on the surface of the photoactive layer; S4 forms a cathode on the surface of the electron transport layer.

8. The method for preparing a non-fullerene organic solar cell according to claim 7, characterized in that: In step S1, the conductive substrate is an ITO / glass substrate, and the spin coating speed is 3000-4000rrpm.

9. The method for preparing a non-fullerene organic solar cell according to claim 7, characterized in that: In step S2, the preparation method of the blend solution is: mixing the solute and the solvent in a glove box, and stirring the blend solution at 100° C. for 20 minutes; the concentration of the blend solution is 23 mg / mL.

10. The method for preparing a non-fullerene organic solar cell according to claim 7, characterized in that: In step S4, the cathode is any one of a carbon electrode, a silver electrode, and an aluminum electrode.

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