Isoindigo based co-polymer solar cell material, and preparation method and application thereof
A technology of solar cells and copolymers, applied in the field of solar cell materials, can solve the problems of low conversion efficiency of inorganic solar cells, achieve excellent photovoltaic performance, increase open circuit voltage, and improve energy conversion efficiency
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[0028] The preparation method of above-mentioned isoindigo copolymer solar cell material, such as figure 1 shown, including the following steps:
[0029] S1, respectively provide compound A and compound B represented by the following structural formula,
[0030] A: 2,6-Ditrimethyltin-4,8-dialkoxybenzodithiophene;
[0031] B: 6,6'-dibromo-N,N'-dialkylisoindigo;
[0032] Among them, in compound A, R 1 for C 1 ~C 20 The alkyl group; in compound B, R 2 for C 1 ~C 20 the alkyl group;
[0033] S2. In an oxygen-free environment (such as an oxygen-free environment composed of nitrogen, argon, or a mixture of nitrogen and argon), the compound A and compound B are added in a molar ratio of 1:1 into the catalyst containing In an organic solvent, after fully dissolving, carry out the Stille coupling reaction at 70-130° C. for 12-96 hours, then cool down to stop the reaction to obtain a mixed solution, which contains the product, that is, the isoindigo having the following str...
Embodiment 1
[0047] The isoindigo-based copolymer solar cell material of the present embodiment, that is, poly{4,8-bis(n-octyloxy)benzodithiophene-co-N, N'-di-n-octylisoindigo}, wherein, R 1 is n-octyl, R 2 Be n-octyl, n is 60, and its structural formula is as follows:
[0048]
[0049] The preparation steps of above-mentioned polymer are as follows:
[0050] The reaction formula is as follows:
[0051]
[0052]2,6-Ditrimethyltin-4,8-di(n-octyloxy)benzodithiophene (232mg, 0.3mmol), 6,6'-dibromo-N,N'-di-n-octyl Isindigo (193mg, 0.3mmol), tridibenzylideneacetone dipalladium (13.75mg, 0.015mmol), tri-tert-butylphosphine (24.2mg, 0.12mmol) were added into a flask containing 12mL of toluene, and then nitrogen was ventilated. After about 30 minutes in the air, stir at 95°C, conduct Stille coupling reaction for 40 hours, and stop the polymerization reaction after cooling down to obtain a mixed solution.
[0053] Add 40mL of methanol to the flask, carry out precipitation treatment on the...
Embodiment 2
[0057] The isoindigo-based copolymer solar cell material of this embodiment, that is, poly{4,8-bis(methoxy)benzodithiophene-co-N,N'-bis(n-eicosyl)isoindigo}, Among them, R 1 is methyl, R 2 It is n-eicosyl, n is 40, and its structural formula is as follows:
[0058]
[0059] The preparation steps of above-mentioned polymer are as follows:
[0060] The reaction formula is as follows:
[0061]
[0062] 2,6-Ditrimethyltin-4,8-bis(methoxy)benzodithiophene (115 mg, 0.2 mmol), 6,6'-dibromo-N,N'-bis(eicosane base) isoindigo (196mg, 0.2mmol) was added into a flask filled with 15ml of N,N-dimethylformamide solvent, dissolved into a solution, and the flask was evacuated to remove oxygen and filled with argon, then added bistriphenyl Phosphine palladium dichloride (5.6 mg, 0.008 mmol) was stirred at 120° C. for Stille coupling reaction for 24 h, and the polymerization reaction was stopped after cooling down to obtain a mixed solution.
[0063] Add 50mL of methanol to the flask,...
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