Block conjugated polymer as well as preparation method and application thereof

Abstract

The invention discloses a block conjugated polymer as well as a preparation method and application thereof, the structural formula of the block conjugated polymer is as follows: # imgabs0 #, the preparation method comprises the following steps: respectively preparing a first block polymer P1 and a second block polymer P2 by adopting a stille coupling mode, and then reacting the first block polymer P1 with the second block polymer P2 to prepare the block conjugated polymer. The block polymer with controllable structure core molecular weight is prepared by controlling the structures, molecular weights and proportions of the first block and the second block, the process is simple, and the prepared block polymer has high crystallinity and good solubility at the same time and has good application prospects.

Description

Technical Field

[0001] The present invention relates to the technical field of photovoltaic materials, and relates to a block conjugated polymer, a preparation method thereof and applications thereof, and in particular to a block conjugated polymer, a preparation method thereof and applications of the copolymer donor in optoelectronic functional devices. Background Art

[0002] In recent years, organic solar cells (OSCs) have developed rapidly, among which polymer solar cells with p-type polymers as donors have received increasing attention due to their adjustable complementary absorption between donors and acceptors and excellent morphological stability. However, due to the relatively regular arrangement of traditional binary copolymer polymers, they have strong crystallinity, but after polymerization to a certain extent, their solubility will drop sharply, which brings great trouble to the subsequent solution-processed device production; on the other hand, high molecular weight polymers can provide high charge mobility, which is beneficial to charge migration in solar cells. Therefore, high-performance polymers usually need to have high crystallinity to form a continuous phase morphology, and need to maintain a suitable molecular weight to provide a certain solubility in organic solvents, which increases the difficulty of synthesizing high-quality polymers.

[0003] Studies have found that appropriate crystallinity can effectively improve charge mobility, thereby obtaining high-performance solar cells. However, excessive crystallinity will lead to excessively large phase separation in the active layer, severe charge recombination, and even the inability to process the device with solvents. At present, the common practice is to add a third component to a polymer with strong crystallinity to increase the overall disorder of the polymer and achieve the goal of regulating crystallinity and solubility. However, while the solubility of the polymer synthesized by the traditional ternary material synthesis method is improved, the crystallinity is also significantly reduced, thereby affecting the photoelectric properties of the polymer. In addition, the ternary material synthesis process is relatively complicated.

[0004] Therefore, it is of great practical significance to develop a polymer with simple process and that can simultaneously achieve high crystallinity and good solubility. Summary of the invention

[0005] Due to the above-mentioned defects in the prior art, the present invention provides a polymer with a simple process and capable of taking into account both high crystallinity and good solubility. Specifically, it is a method for regulating the crystallinity and aggregation strength of a polymer donor by controlling the fragment length of the block through block polymerization between fragments of a highly crystalline binder, and a polymer obtained therefrom, which overcomes the defects of existing polymers that it is difficult to take into account both high crystallinity and good solubility at the same time and the process is relatively complicated.

[0006] In order to achieve the above object, the present invention provides the following technical solutions:

[0007] A block conjugated polymer has the following structural formula:

[0008]

[0009] In the formula, P1 and P2 are each independently selected from DA type polymer fragments, x is the number of repetitions of the main chain unit of polymer P1, specifically a natural number of 10 to 100, y is the number of repetitions of the main chain unit of polymer P2, specifically a natural number of 10 to 100, and n is the number of repetition units of the block polymer, specifically a natural number of 1 to 10.

[0010] As the preferred technical solution:

[0011] A block conjugated polymer as described above, wherein the structure of P1 is as follows:

[0012]

[0013] P1 is poly[[4,8-di[5-(2-ethylhexyl, 4-fluoro-2-thienyl]benzo[1,2-b:4,5-b']dithiophene-2,6-diyl]-2,5-thiophenediyl[5,7-di(2-ethylhexyl, 4,8-dioxy-4H,8H-benzo[1,2-c:4,5-c']dithiophene-1,3-diyl]-2,5-thiophenediyl, referred to as PM6;

[0014] The structure of P2 is as follows:

[0015]

[0016] P2 is poly[bithieno[3,2-e:2',3'-g]-2,1,3-benzothiadiazole-5,8-diyl[4-(2-butyloctyl)-2,5-thiophenediyl][4,8-bis[5-(2-ethylhexyl)-4-fluoro-2-thiophene]benzo[1,2-b:4,5-b']-bithiophene-2,6-][3-(2-butyloctyl)-2,5-thiophenediyl]], abbreviated as D18.

[0017] A block conjugated polymer as described above, wherein the number average molecular weight of the block conjugated polymer is 1,000 to 1,000,000.

[0018] A block conjugated polymer as described above, wherein the number average molecular weight of the block conjugated polymer is 10,000 to 500,000.

[0019] A block conjugated polymer as described above, wherein the number average molecular weight of the block conjugated polymer is 30,000 to 200,000.

[0020] The present invention also provides a method for preparing a block conjugated polymer as described above, wherein a first block polymer P1 and a second block polymer P2 are prepared respectively by Stille coupling, and then the first block polymer P1 reacts with the second block polymer P2 to obtain a block conjugated polymer.

[0021] As the preferred technical solution:

[0022] According to the method described above, the weight average molecular weight of the first block polymer P1 is 1000 to 10000;

[0023] The weight average molecular weight of the second block polymer P2 is 5000 to 20000;

[0024] The preparation of the first block polymer P1 is completed under the catalytic action of a palladium catalyst and the reaction is carried out in a solvent I, the reaction temperature is 100-110° C., the reaction time is 0.5-3 hours, the solvent I is a benzene organic reagent and the mass of the solvent I is 10-20 times the total mass of the reactants;

[0025] The preparation of the second block polymer P2 is completed under the catalytic action of a palladium catalyst and the reaction is carried out in a solvent II, the reaction temperature is 100-110° C., the reaction time is 0.2-1 h, the solvent II is a benzene organic reagent and the mass of the solvent II is 10-20 times the total mass of the reactants;

[0026] The preparation of the block conjugated polymer is completed under the catalysis of a palladium catalyst, the reaction temperature is 100-110°C, the reaction time is 1-24 hours, and the first block polymer P1 is 20-40wt% of the total mass of the first block polymer P1 and the second block polymer P2.

[0027] According to the method described above, the weight average molecular weight of the first block polymer P1 is 2000 to 5000;

[0028] The weight average molecular weight of the second block polymer P2 is 10000 to 20000;

[0029] The benzene organic reagent is selected from one or more of toluene, xylene, chlorobenzene and dichlorobenzene;

[0030] The reaction time for preparing the first block polymer P1 is 1 to 1.5 hours, the palladium catalyst is tetrakistriphenylphosphine palladium, and the mass of the solvent I is 12 to 15 times the total mass of the reactants when preparing the first block polymer P1;

[0031] The palladium catalyst used in preparing the second block polymer P2 is bis(dibenzylideneacetone palladium), and the mass of the solvent II is 12 to 15 times the total mass of the reactants in preparing the second block polymer P2;

[0032] The palladium catalyst used in preparing the block conjugated polymer is bis(dibenzylideneacetone palladium), the reaction time is 4 to 8 hours, and the first block polymer P1 is 20 to 30 wt% of the total mass of the first block polymer P1 and the second block polymer P2.

[0033] According to the method described above, after the reaction is completed, the reaction product is precipitated, filtered and dried to obtain a block conjugated polymer, wherein the precipitation is carried out in ethanol.

[0034] In addition, the present invention also provides the use of the block conjugated polymer as described above in an organic solar device, wherein the block conjugated polymer is blended with a polymer receptor to serve as an active layer of the organic solar device.

[0035] The above technical solution is only a feasible technical solution of the present invention, and the protection scope of the present invention is not limited thereto. Those skilled in the art can reasonably adjust the specific design according to actual needs.

[0036] Invention mechanism:

[0037] The present invention adopts a conventional Stille coupling polymerization method to prepare a block polymer through a distributed reaction, and then combines two block polymers. The method is conventional and easy to realize industrialization. The molecular weight and ratio of the first block polymer and the second block polymer are adjusted to design the molecular structure. While maintaining the original high-performance segment structure, the aggregation degree of the entire polymer molecules is slightly reduced by the block method, that is, the high crystallinity of the front-stage pre-polymer is retained and the aggregation between the polymer molecules is reduced. By adjusting the length and content of the block segments, excellent photoelectric performance can be maintained within a certain proportion range, thereby hopefully solving the batch problem of high-quality polymers.

[0038] The above invention has the following advantages or beneficial effects:

[0039] (1) The block conjugated polymer of the present invention is designed to have a molecular structure by adjusting the molecular weight and ratio of the first block polymer and the second block polymer. While maintaining the original high-performance segment structure, the aggregation degree of the entire polymer molecule is slightly reduced by the block method, that is, the high crystallinity is retained and the aggregation between the polymer molecules is reduced;

[0040] (2) The block conjugated polymer of the present invention can maintain excellent photoelectric properties within a certain ratio range by regulating the length and content of the block segments, thereby hopefully solving the batch problem of high-quality polymers;

[0041] (3) The method for preparing the block conjugated polymer of the present invention adopts a conventional Stille coupling polymerization method to prepare a block polymer by a distributed reaction, and then combine two block polymers. The method is conventional, easy to realize industrialization, and has good application prospects. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] The present invention and its features, appearance and advantages will become more apparent by reading the detailed description of non-limiting embodiments with reference to the following drawings. The same reference numerals indicate the same parts in all the drawings. The drawings are not drawn to scale, and emphasis is placed on illustrating the subject matter of the present invention.

[0043] Figure 1 This is a schematic diagram of the device structure of a formal organic solar cell prepared in Application Example 1;

[0044] Figure 2 This is the current density-voltage test curve of the formal organic solar cell prepared in Application Example 1. DETAILED DESCRIPTION

[0045] The structure of the present invention is further described below in conjunction with the accompanying drawings and specific embodiments, but is not intended to limit the present invention.

[0046] Example 1

[0047] A method for preparing a block conjugated polymer comprises the following steps:

[0048] 0.5 g (4,8-bis (5- (2-ethylhexyl) -4-fluorothienyl) benzo [1,2-B: 4,5-B'] dithienyl) bistrimethyltin and 0.4 g 1,3-bis (5-bromothiophene) -5,7-di (2-isooctyl) benzo [1,2-c: 4,5-c'] dithiophene-4,8-dione) were added to the reactor #1, 30 ml of toluene solvent was added, and the mixture was heated to 110 °C. After deoxygenation three times, 18 mg of tetrakis triphenylphosphine palladium was added to start the reaction. The reaction was completed after 1 hour to prepare the first block polymer with a polymer molecular weight of 3500.

[0049] 0.5 g (4,8-bis(5-(2-ethylhexyl)-4-fluorothienyl)benzo[1,2-B:4,5-B']dithienyl)bistrimethyltin and 4.8 g 5,8-bis[5-bromo-4-(2-butyl)-2-thienyl]dithieno[3,2-e:2',3'-g]-2,1,3-benzothiadiazole) were added to reactor #2, 33 ml toluene solvent was added, and the mixture was heated to 110°C. After deoxygenation three times, 10 mg bisdibenzylideneacetonepalladium was added to start the reaction. The reaction was terminated after 0.5 h to prepare a second block polymer with a polymer molecular weight of 10300.

[0050] The first block polymer was added to the 2# reactor, and 10 mg of bis(dibenzylideneacetonepalladium) was added, and the reaction was continued at 110° C. for 24 hours. After the reaction, a block conjugated polymer 1 was prepared. The block conjugated polymer 1 was poured into an ethanol solvent for sedimentation, filtered, and dried to obtain a dried block conjugated polymer 1, with a polymer molecular weight of 36,000 and a yield of 95%.

[0051] Example 2

[0052] A method for preparing a block conjugated polymer comprises the following steps:

[0053] 0.2 g (4,8-bis (5- (2-ethylhexyl) -4-fluorothienyl) benzo [1,2-B: 4,5-B'] dithienyl) bistrimethyltin and 0.16 g 1,3-bis (5-bromothiophene) -5,7-di (2-isooctyl) benzo [1,2-c: 4,5-c'] dithiophene-4,8-dione) were added to reactor #1, 12 ml toluene solvent was added, and the mixture was heated to 110 °C. After deoxygenation three times, 8 mg tetrakis triphenylphosphine palladium was added to start the reaction. The reaction was completed after 1 hour to prepare the first block polymer with a polymer molecular weight of 3700.

[0054] 0.5 g (4,8-bis(5-(2-ethylhexyl)-4-fluorothienyl)benzo[1,2-B:4,5-B']dithienyl)bistrimethyltin and 4.8 g 5,8-bis[5-bromo-4-(2-butyl)-2-thienyl]dithieno[3,2-e:2',3'-g]-2,1,3-benzothiadiazole) were added to reactor #2, 33 ml toluene solvent was added, and the mixture was heated to 110°C. After deoxygenation three times, 10 mg bisdibenzylideneacetonepalladium was added to start the reaction. The reaction was terminated after 0.5 h to prepare a second block polymer with a polymer molecular weight of 10300.

[0055] The first block polymer was added to reactor #2, and 10 mg of bis(dibenzylideneacetonepalladium) was added. The reaction was continued at 110°C for 24 hours. After the reaction, a block conjugated polymer 2 was prepared. The block conjugated polymer 2 was poured into an ethanol solvent for sedimentation, filtered, and dried to obtain a dried block conjugated polymer 2 with a polymer molecular weight of 34,600 and a yield of 94%.

[0056] Example 3

[0057] A method for preparing a block conjugated polymer comprises the following steps:

[0058] 0.1 g (4,8-bis(5-(2-ethylhexyl)-4-fluorothienyl)benzo[1,2-B:4,5-B']dithienyl)bistrimethyltin and 0.08 g 1,3-bis(5-bromothiophene)-5,7-di(2-isooctyl)benzo[1,2-c:4,5-c']dithiophene-4,8-dione) were added to reactor #1, 6 ml toluene solvent was added, and the mixture was heated to 110°C. After deoxygenation three times, 4 mg tetrakistriphenylphosphine palladium was added to start the reaction. The reaction was completed after 1 hour to prepare the first block polymer with a polymer molecular weight of 3800.

[0059] 0.5 g (4,8-bis(5-(2-ethylhexyl)-4-fluorothienyl)benzo[1,2-B:4,5-B']dithienyl)bistrimethyltin and 4.8 g 5,8-bis[5-bromo-4-(2-butyl)-2-thienyl]dithieno[3,2-e:2',3'-g]-2,1,3-benzothiadiazole) were added to reactor #2, 33 ml toluene solvent was added, and the mixture was heated to 110°C. After deoxygenation three times, 10 mg bisdibenzylideneacetonepalladium was added to start the reaction. The reaction was terminated after 0.5 h to prepare a second block polymer with a polymer molecular weight of 10300.

[0060] The first block polymer was added to reactor #2, and 10 mg of bis(dibenzylideneacetonepalladium) was added. The reaction was continued at 110°C for 24 hours. After the reaction, a block conjugated polymer 3 was prepared. The block conjugated polymer 3 was poured into an ethanol solvent for sedimentation, filtered, and dried to obtain a dried block conjugated polymer 3 with a polymer molecular weight of 34,200 and a yield of 96%.

[0061] Comparative Example 1

[0062] A method for preparing a block conjugated polymer comprises the following steps:

[0063] 0.1 g (4,8-bis(5-(2-ethylhexyl)-4-fluorothienyl)benzo[1,2-B:4,5-B']dithienyl)bistrimethyltin and 0.08 g 1,3-bis(5-bromothiophene)-5,7-di(2-isooctyl)benzo[1,2-c:4,5-c']dithiophene-4,8-dione) were added to reactor #1, 6 ml toluene solvent was added, and the mixture was heated to 110°C. After deoxygenation three times, 4 mg tetrakistriphenylphosphine palladium was added to start the reaction. The reaction was completed after 24 hours to prepare a block polymer with a polymer molecular weight of 36700.

[0064] Application Example 1

[0065] In this application example, the block conjugated polymer described in Example 1 is blended with L8-BO as the active layer of an organic solar cell device, which can realize a high-efficiency organic thin-film photovoltaic device. The device is prepared by spin coating. The device structure of the organic solar cell is as follows Figure 1 As shown, from bottom to top, they are glass substrate / indium tin oxide (ITO) / hole transport layer / active layer / electron transport layer (PDINN) / silver (Ag). The specific preparation steps are as follows:

[0066] Step 1: The patterned ITO glass was ultrasonically cleaned with glass cleaning solution, deionized water, acetone, and isopropanol for 20 minutes in sequence, and the surface was blown dry with an air gun.

[0067] Step 2: The dried ITO glass is surface treated with a UV-ozone machine or a plasma cleaning machine. The UV-ozone machine treatment time is about 15 minutes, and the plasma cleaning machine treatment time is about 1 minute. Then, the PEDOT:PSS is filtered and spin-coated on the ITO glass sheet treated in step 1 at a speed of 4000 rpm, and then heated at 150°C for 15 minutes.

[0068] Step 3: The block conjugated polymer described in Example 1 and the small molecule electron acceptor L8-BO are blended in a mass ratio of 1:1.2, dissolved in chloroform solvent at a total concentration of 15 mg / mL to obtain an active layer solution, and then the additive diiodomethane (DIM) is added at a volume ratio of 0.25%, and stirred at room temperature for 1 hour to dissolve for use.

[0069] Step 4: Spin the active layer solution onto the substrate surface in step 3 at a spin coating speed of 2500 rpm to prepare the active layer. Then anneal on a 90°C hot plate for 5 minutes. After cooling, spin coat the electron transport layer (PDINN, 0.5 mg / mL methanol solution) onto the active layer surface at a spin coating speed of 2500 rpm.

[0070] Step 5: Place the device in step 4 on a patterned mask and transfer it to a vacuum thermal evaporation coating apparatus, and evaporate a 150nm silver electrode at a vacuum degree of 1×10-6mbar.

[0071] The current density-voltage of the prepared organic solar cell is as follows Figure 2 As shown in the figure, Voltage represents voltage and currentdensity represents current density. The device parameters are as follows: open circuit voltage Voc = 0.883 V, current density Jsc = 25.8 mA / cm 2 , fill factor FF = 79.9%, efficiency PCE = 18.2%.

[0072] Comparative application example 1

[0073] In this comparative application example, the block conjugated polymer described in comparative example 1 is blended with L8-BO as the active layer of an organic solar cell device, which can realize a high-efficiency organic thin-film photovoltaic device. The device is prepared by spin coating. The device structure of the organic solar cell is glass substrate / indium tin oxide (ITO) / hole transport layer / active layer / electron transport layer (PDINN) / silver (Ag) from bottom to top. The specific preparation steps are as follows:

[0074] Step 1: The patterned ITO glass was ultrasonically cleaned with glass cleaning solution, deionized water, acetone, and isopropanol for 20 minutes in sequence, and the surface was blown dry with an air gun.

[0075] Step 2: The dried ITO glass is surface treated with a UV-ozone machine or a plasma cleaning machine. The UV-ozone machine treatment time is about 15 minutes, and the plasma cleaning machine treatment time is about 1 minute. Then, the PEDOT:PSS is filtered and spin-coated on the ITO glass sheet treated in step 1 at a speed of 4000 rpm, and then heated at 150°C for 15 minutes.

[0076] Step 3: The block conjugated polymer described in Comparative Example 1 and the small molecule electron acceptor L8-BO are blended in a mass ratio of 1:1.2, dissolved in chloroform solvent at a total concentration of 15 mg / mL to obtain an active layer solution, and then the additive diiodomethane (DIM) is added at a volume ratio of 0.25%, and stirred at room temperature for 1 hour to dissolve for use.

[0077] Step 4: Spin the active layer solution onto the substrate surface in step 3 at a spin coating speed of 2500 rpm to prepare the active layer. Then anneal on a 90°C hot plate for 5 minutes. After cooling, spin coat the electron transport layer (PDINN, 0.5 mg / mL methanol solution) onto the active layer surface at a spin coating speed of 2500 rpm.

[0078] Step 5: Place the device in step 4 on a patterned mask and transfer it to a vacuum thermal evaporation coating apparatus, and evaporate a 150nm silver electrode at a vacuum degree of 1×10-6mbar.

[0079] The device parameters of the prepared organic solar cell are as follows: open circuit voltage V oc =0.870V, current density J sc =25.5mA / cm 2 , fill factor FF = 79.3%, efficiency PCE = 17.6%.

[0080] After comparing application example 1 with comparative application example 1, it is found that by adjusting the molecular weight and ratio of the first block polymer and the second block polymer to design the molecular structure, while maintaining the original high-performance segment structure of each, the aggregation degree of the entire polymer molecules is slightly reduced by blocking, that is, the high crystallinity of the previous polymer is retained and the aggregation between polymer molecules is reduced, which can improve the photoelectric performance of the organic solar cell device made therefrom to a certain extent.

[0081] Those skilled in the art should understand that those skilled in the art can implement variations by combining the prior art and the above embodiments, which will not be described in detail here. Such variations do not affect the essential content of the present invention, and will not be described in detail here.

[0082] The above describes the preferred embodiments of the present invention. It should be understood that the present invention is not limited to the above-mentioned specific embodiments, and the devices and structures that are not described in detail should be understood to be implemented in a common manner in the art; any technician familiar with the art can use the above-disclosed methods and technical contents to make many possible changes and modifications to the technical solutions of the present invention without departing from the scope of the technical solutions of the present invention, or modify them into equivalent embodiments of equivalent changes, which does not affect the essential content of the present invention. Therefore, any simple modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solutions of the present invention are still within the scope of protection of the technical solutions of the present invention.

Claims

1. A block conjugated polymer, characterized in that: Its structural formula is as follows: In the formula, P1 and P2 are each independently selected from DA type polymer fragments, x is the number of repetitions of the main chain unit of polymer P1, specifically a natural number of 5 to 100, y is the number of repetitions of the main chain unit of polymer P2, specifically a natural number of 5 to 100, and n is the number of repetition units of the block polymer, specifically a natural number of 1 to 20.

2. A block conjugated polymer according to claim 1, characterized in that: The structure of P1 is as follows: The structure of P2 is as follows:

3. A block conjugated polymer according to claim 1, characterized in that: The number average molecular weight of the block conjugated polymer is 1,000 to 1,000,000.

4. A block conjugated polymer according to claim 3, characterized in that: The number average molecular weight of the block conjugated polymer is 10,000 to 500,000.

5. A block conjugated polymer according to claim 4, characterized in that: The number average molecular weight of the block conjugated polymer is 30,000 to 200,000.

6. A method for preparing a block conjugated polymer as claimed in any one of claims 1 to 5, characterized in that: After the first block polymer P1 and the second block polymer P2 are prepared respectively by Stille coupling, the first block polymer P1 reacts with the second block polymer P2 to obtain a block conjugated polymer.

7. The method according to claim 6, characterized in that The weight average molecular weight of the first block polymer P1 is 1000 to 10000; The weight average molecular weight of the second block polymer P2 is 5000 to 20000; The preparation of the first block polymer P1 is completed under the catalytic action of a palladium catalyst and the reaction is carried out in a solvent I, the reaction temperature is 100-110° C., the reaction time is 0.5-3 hours, the solvent I is a benzene organic reagent and the mass of the solvent I is 10-20 times the total mass of the reactants; The preparation of the second block polymer P2 is completed under the catalytic action of a palladium catalyst and the reaction is carried out in a solvent II, the reaction temperature is 100-110° C., the reaction time is 0.2-1 h, the solvent II is a benzene organic reagent and the mass of the solvent II is 10-20 times the total mass of the reactants; The preparation of the block conjugated polymer is completed under the catalysis of a palladium catalyst, the reaction temperature is 100-110°C, the reaction time is 1-24 hours, and the first block polymer P1 is 20-40wt% of the total mass of the first block polymer P1 and the second block polymer P2.

8. The method according to claim 7, characterized in that The weight average molecular weight of the first block polymer P1 is 2000 to 5000; The weight average molecular weight of the second block polymer P2 is 10000 to 20000; The benzene organic reagent is selected from one or more of toluene, xylene, chlorobenzene and dichlorobenzene; The reaction time for preparing the first block polymer P1 is 1 to 1.5 hours, the palladium catalyst is tetrakistriphenylphosphine palladium, and the mass of the solvent I is 12 to 15 times the total mass of the reactants when preparing the first block polymer P1; The palladium catalyst used in preparing the second block polymer P2 is bis(dibenzylideneacetone palladium), and the mass of the solvent II is 12 to 15 times the total mass of the reactants in preparing the second block polymer P2; The palladium catalyst used in preparing the block conjugated polymer is bis(dibenzylideneacetone palladium), the reaction time is 4 to 8 hours, and the first block polymer P1 is 10 to 40 wt% of the total mass of the first block polymer P1 and the second block polymer P2.

9. The method according to claim 6, characterized in that After the reaction is completed, the reaction product is precipitated, filtered and dried to obtain a block conjugated polymer, wherein the precipitation is carried out in ethanol.

10. Use of a block conjugated polymer according to any one of claims 1 to 5 in an organic solar device, characterized in that: The block conjugated polymer is blended with a polymer receptor to serve as an active layer of an organic solar device.

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