Search

CN-122011342-A - Terpolymer donor material and preparation method and application thereof

CN122011342ACN 122011342 ACN122011342 ACN 122011342ACN-122011342-A

Abstract

The invention provides a ternary copolymer polymer donor material, a preparation method and application thereof, wherein the ternary copolymer polymer donor material comprises a D-A alternating copolymer and a third unit introduced into the D-A alternating copolymer, the third unit contains a thiazolobenzothienyl group or a benzodithiazole group, the ternary copolymer donor material introduces the thiazolobenzothienyl group or the benzodithiazole structure into a main chain of a polymer donor to prepare a series of novel polymer donor materials, the unique micro D-A charge transfer characteristic of the novel polymer donor materials effectively optimizes polymer electron delocalization distribution, promotes intramolecular charge transfer and improves carrier mobility of the materials.

Inventors

  • WANG JUNJIE
  • LIU YUCHAO
  • Ying Shian
  • WANG SHAOJUAN
  • YAN SHOUKE

Assignees

  • 青岛科技大学

Dates

Publication Date
20260512
Application Date
20260211

Claims (10)

  1. 1. A terpolymer donor material comprising a D-a alternating copolymer and a third unit incorporated into the D-a alternating copolymer, the third unit comprising a thiazolobenzothiene group or a benzodithiazole group.
  2. 2. The terpolymer donor material according to claim 1, wherein the structural general formula of the third unit is represented by formula I: I is a kind of Wherein R1 is C or N element, R2 is hydrogen, C 1 -C 20 straight-chain alkyl or branched-chain alkyl, C 1 -C 20 straight-chain alkoxy or branched-chain alkoxy, C 1 -C 20 straight-chain silane group or branched-chain silane group, C 1 -C 20 straight-chain alkylthio or branched-chain alkylthio, and R3 is halogen or hydrogen.
  3. 3. The terpolymer donor material according to claim 2, wherein the third unit is Or (b) 。
  4. 4. The terpolymer donor material according to claim 1, wherein the D-a alternating copolymer comprises electron donor units D and electron acceptor units a, the terpolymer donor material having the general structural formula of formula II: II (II) Wherein m is 0.5-0.95, and n is 0.05-0.5.
  5. 5. The terpolymer donor material according to claim 4, wherein the electron donor unit D is one of the following structural units: 、 、 、 、 、 、 、 、 、 、 、 ; The electron acceptor unit A is one of the following structural units: 、 、 、 、 、 、 ; Wherein R11 is hydrogen, C 1 -C 20 straight-chain alkyl or branched-chain alkyl, C 1 -C 20 straight-chain alkoxy or branched-chain alkoxy, C 1 -C 20 straight-chain silane group or branched-chain silane group, C 1 -C 20 straight-chain alkylthio or branched-chain alkylthio, and R21 is hydrogen or halogen.
  6. 6. The terpolymer donor material according to claim 1, wherein the terpolymer donor material has the structural formula: 、 、 Or (b) Wherein X is a halogen element.
  7. 7. A process for preparing a terpolymer donor material according to any one of claims 1 to 6, comprising introducing into the D-A alternating copolymer a third unit comprising a thiazolobenzothiene group or a benzodithiazole group and copolymerizing to form the terpolymer donor material.
  8. 8. The process for producing a terpolymer donor material according to claim 7, wherein the electron donor unit D and the electron acceptor unit a of the D-a alternating copolymer and the third unit and the palladium-based catalyst are added together to an anhydrous toluene solvent to obtain a mixture, the mixture is stirred at 110 to 120 ℃ for 22 to 26 hours, and then the mixture is poured into water, extracted with methylene chloride, and dried over anhydrous sodium sulfate.
  9. 9. The method for preparing a ternary copolymer polymer donor material according to claim 8, wherein the molar ratio of the electron donor unit D to the electron acceptor unit a to the third unit is 1:0.5-0.95:0.05-0.5, the palladium-based catalyst is tetrakis (triphenylphosphine) palladium (Pd (PPh 3 ) 4 ), and the electron donor unit D and the electron acceptor unit a of the D-a alternating copolymer and the third unit and the catalyst palladium-based catalyst are deoxygenated with an inert gas for 30 minutes before adding them to the anhydrous toluene solvent.
  10. 10. Use of a terpolymer donor material according to any of claims 1-6 in an organic solar cell, wherein the terpolymer donor material is used in a photoactive layer of an organic solar cell.

Description

Terpolymer donor material and preparation method and application thereof Technical Field The invention relates to the technical field of organic photoelectricity, in particular to a terpolymer donor material and a preparation method and application thereof. Background The Organic Solar Cells (OSCs) serving as novel photovoltaic technology have the advantages of light weight, flexibility, large-area preparation by a solution method and the like, become an important technology for utilizing green clean energy, and have wide application prospects. With the advent of new materials, especially non-fullerene acceptor small molecules, and continued optimization of device technology, the energy conversion efficiency (PCE) of single junction OSCs has reached over 20%. The development of the donor polymer is relatively slow compared to the rapid development of small molecules of non-fullerene receptors. To date, only a few polymer donors (e.g., PM6, D18, PBQx-TF, etc.) have achieved high efficiencies in binary devices. Therefore, the development of high performance donor polymers suitable for non-fullerene systems is an important direction to further increase the efficiency of OSCs. In a typical D-a conjugated polymer, the polymeric units (D and a portions) are alternately connected to each other along the polymer backbone, but are limited by the delocalization conduction of the single two D-a monomer charges in a small electron cloud, and the intramolecular charge transfer is inhibited, so that the carrier mobility is low, the absorption spectrum cannot be effectively expanded, and further increases of the short-circuit current (J SC) and the open-circuit voltage (V OC) are limited, so that the PCE is finally stopped. Accordingly, the prior art is subject to further development. Disclosure of Invention Aiming at various defects in the prior art, in order to solve the problems, a terpolymer donor material, a preparation method and application thereof are provided, and the following technical scheme is provided: a terpolymer donor material comprising a D-a alternating copolymer and a third unit incorporated into the D-a alternating copolymer, the third unit containing a thiazolobenzothiene group or a benzodithiazole group. Further, the structural general formula of the third unit is shown as formula I: I is a kind of Wherein R1 is C or N element, R2 is hydrogen, C 1-C20 straight-chain alkyl or branched-chain alkyl, C 1-C20 straight-chain alkoxy or branched-chain alkoxy, C 1-C20 straight-chain silane group or branched-chain silane group, C 1-C20 straight-chain alkylthio or branched-chain alkylthio, and R3 is halogen or hydrogen. Further, the third unit isOr (b)。 Further, the D-A alternating copolymer comprises an electron donor unit D and an electron acceptor unit A, and the structural general formula of the terpolymer donor material is shown in a formula II: II (II) Wherein m is 0.5-0.95, and n is 0.05-0.5. Further, the electron donor unit D is one of the following structural units:、、、、、、、、、、、; The electron acceptor unit A is one of the following structural units: 、、、、、、; Wherein R11 is hydrogen, C 1-C20 straight-chain alkyl or branched-chain alkyl, C 1-C20 straight-chain alkoxy or branched-chain alkoxy, C 1-C20 straight-chain silane group or branched-chain silane group, C 1-C20 straight-chain alkylthio or branched-chain alkylthio, and R21 is hydrogen or halogen. Further, the structural formula of the terpolymer donor material is as follows: 、、 Or (b) Wherein X is a halogen element. In addition, the invention also provides a preparation method of the terpolymer donor material, which comprises the step of introducing a third unit containing a thiazolobenzothienyl group or a benzodithiazole group into the D-A alternating copolymer to copolymerize to form the terpolymer thiazolobenzothienyl terpolymer donor material. Further, the electron donor unit D and the electron acceptor unit A of the D-A alternating copolymer and the third unit and the palladium-based catalyst are added together to an anhydrous toluene solvent to obtain a mixture, the mixture is stirred at 110 to 120℃for 22 to 26 hours, and then the mixture is poured into water, extracted with methylene chloride, and dried over anhydrous sodium sulfate. Further, the molar ratio of the electron donor unit D to the electron acceptor unit A to the third unit is 1:0.5-0.95:0.05-0.5, the palladium-based catalyst is tetrakis (triphenylphosphine) palladium (Pd (PPh 3)4), and the electron donor unit D and the electron acceptor unit A of the D-A alternating copolymer and the third unit and the catalyst palladium-based catalyst are deoxidized with an inert gas for 30 minutes before being added into the anhydrous toluene solvent. The invention also provides application of the terpolymer donor material in an organic solar cell, and the terpolymer donor material is applied to a photoactive layer of the organic solar cell. The beneficial effects are that: 1. According to the in