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A polymer donor with reduced crystallinity and its preparation method and application
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A crystalline, polymer technology, applied in the field of chemistry, can solve the problems of scarcity, disadvantage, low filling factor, etc., and achieve the effect of high device efficiency, strong feasibility and good phase morphology
Active Publication Date: 2021-06-04
NANCHANG UNIV
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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.
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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 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%;
[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, a...
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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Abstract
A polymer donor with reduced crystallinity and its preparation method and application, having the following basic unit structure: wherein, A 1 It is a donor group with strong crystallinity, D is a π-bridge group, and A 2 It is an ester-containing unit group. Will A 1 、A 2 And D is fed into the material according to the monomer ratio of the polymer, the gas is replaced three times, the catalyst and the solvent are added, and the reaction is carried out in a nitrogen atmosphere for 1 hour; then the reaction solution is settled in methanol, filtered with suction, and then extracted with acetone, n-hexane, and chloroform respectively. , the extraction solution was spin-dried with a rotary evaporator, settled again in methanol, and filtered with suction to obtain a polymer donor. The crystallinity of the polymer donor material of the present invention is significantly regulated, and the morphology of the active layer is optimized, which is of great significance for large-area printing of solar cells by roll-to-roll.
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...
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