Polymer donor with reduced crystallinity, and preparation method and application thereof

A crystalline, polymer technology, applied in the field of chemistry, can solve the problems of low filling factor, scarcity, disadvantage, etc., and achieve the effects of good phase morphology, high device efficiency, and strong feasibility

Active Publication Date: 2020-01-10
NANCHANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the fill factor of the device is generally low, not exceeding 72.0%, which is not conducive to obtaining higher photoelectric conversion efficiency
At present, there is still a lack of technology on how to effectively control the crystallinity and aggregation strength of polymer donors, and achieve higher fill factors and device efficiencies.

Method used

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  • Polymer donor with reduced crystallinity, and preparation method and application thereof
  • Polymer donor with reduced crystallinity, and preparation method and application thereof
  • Polymer donor with reduced crystallinity, and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Example 1. Synthesis of PffBT4T-4T2FC-9 / 1.

[0034]

[0035] a) 2-Bromo-3-thiophenecarboxylic acid (2.64g, 12.74mmol), 1-bromo-2-hexyldecane (11.68g, 38.02mmol) and potassium carbonate (8g, 57.88mmol) were added to a round bottom flask, The reactant was dissolved with 30ml DMF as solvent. Stir at 80°C for 40 hours. After the reaction was completed, it was cooled to room temperature. Pour the mixture into a pear-shaped separatory funnel, and 2 Cl 2 After extraction, the obtained organic phase was dried over anhydrous sodium sulfate. After evaporating the solvent, the column was passed to obtain a total of 4.94 g of pure compounds, with a yield of 90%;

[0036] b) The product of step a) (2 g, 4.64 mmol), (3,3'-difluoro-[2,2'-bithiophene]-5,5'-diyl)bis(trimethylstannane) ( 0.96g, 1.8mmol) and tetrakis (triphenylphosphine) palladium (170mg, 0.13mmol) were packed into a double-necked reaction flask, and after nitrogen was replaced three times with an oil pump, anhy...

Embodiment 2

[0040] Example 2. Synthesis of PWBT4T-4T2FC-4 / 1.

[0041]

[0042] a) 2-Bromo-3-thiophenecarboxylic acid (2.64g, 12.74mmol), 1-bromo-2-hexyldecane (11.68g, 38.02mmol) and potassium carbonate (8g, 57.88mmol) were added to a round bottom flask, The reactants were dissolved using 30ml DMF as solvent. Stir at 80°C for 40 hours. After the reaction was completed, it was cooled to room temperature. Pour the mixture into a pear-shaped separatory funnel, and 2 Cl 2 After extraction, the obtained organic phase was dried over anhydrous sodium sulfate. After evaporating the solvent, the column was passed to obtain a total of 4.94 g of pure compounds, with a yield of 90%;

[0043] b) The product of step a) (2 g, 4.64 mmol), (3,3'-difluoro-[2,2'-bithiophene]-5,5'-diyl)bis(trimethylstannane) ( 0.96g, 1.8mmol) and tetrakis (triphenylphosphine) palladium (170mg, 0.13mmol) were packed into a double-necked reaction flask, and after nitrogen was replaced three times with an oil pump, an...

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PUM

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Abstract

The invention relates to a polymer donor with reduced crystallinity, and a preparation method and an application thereof. The polymer donor has a basic unit structure shown in the description; and inthe structure, A1 is a donor group with high crystallinity, D is a pi-bridge group, and A2 is an ester group-containing unit group. The preparation method comprises the following steps: adding the A1,A2 and D according to the monomer proportions of the polymer, performing gas replacement three times, adding a catalyst and a solvent, and carrying out a reaction in a nitrogen atmosphere for 1 h; and then settling the obtained reaction solution in methanol, performing suction filtration, performing extraction with acetone, n-hexane and chloroform respectively, spin-drying the obtained extractionsolution with a rotary evaporator, settling the obtained material in methanol again, and performing suction filtration to obtain the polymer donor. The crystallinity of the polymer donor material isobviously regulated, the morphology of an active layer is optimized, and the polymer donor material has great significance for roll-to-roll large-area printing of solar cells.

Description

technical field [0001] The invention belongs to the technical field of chemistry. [0002] technical background [0003] The photoelectric conversion efficiency of organic solar cells is mainly determined by the open circuit voltage, short circuit current density and fill factor, among which the improvement of fill factor is the most difficult and complicated. The size of the filling factor is closely related to the mobility of the active layer, charge recombination and phase separation scale. At present, the improvement of the device efficiency of organic solar cells is mainly by increasing the open circuit voltage and short circuit current density. There is still very little research on improving the fill factor, and the device efficiency is relatively low. [0004] It is found that proper crystallization properties can effectively increase the charge mobility, thereby increasing the fill factor. In the development of polymer donor materials, many materials cannot be proc...

Claims

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Application Information

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IPC IPC(8): C08G61/12H01L51/42H01L51/46
CPCC08G61/126C08G2261/122C08G2261/124C08G2261/1412C08G2261/1426C08G2261/146C08G2261/3223C08G2261/91H10K85/151H10K30/00Y02E10/549
Inventor 谌烈丁珊珊谢谦陈义旺
Owner NANCHANG UNIV
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