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Bidithiophene-benzobis(benzothiadiazole) copolymer and its preparation method and application

A technology of benzothiadiazole and bidithiophene, which is applied in semiconductor/solid-state device manufacturing, organic chemistry, electric solid-state devices, etc., can solve the problem of low energy conversion efficiency, wide energy bandgap, and reduced photon absorption rate of organic solar cells And other issues

Inactive Publication Date: 2016-04-13
OCEANS KING LIGHTING SCI&TECH CO LTD +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the existing polymers containing benzothiadiazole units have a wide energy bandgap (the energy level difference between the HOMO energy level and the LUMO energy level), which reduces the absorption rate of photons in the solar spectrum, making it possible to use Organic solar cells with polymers containing bithiazole units have low energy conversion efficiencies

Method used

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  • Bidithiophene-benzobis(benzothiadiazole) copolymer and its preparation method and application
  • Bidithiophene-benzobis(benzothiadiazole) copolymer and its preparation method and application
  • Bidithiophene-benzobis(benzothiadiazole) copolymer and its preparation method and application

Examples

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preparation example Construction

[0042] One embodiment contains the preparation method of bidithiophene-benzobis(benzothiadiazole) copolymer, such as figure 1 shown, including the following steps:

[0043] Step S100, providing compound A and compound B.

[0044] A is: B is: Among them, R 1 , R 2 for C 1 ~C 20 the alkyl group, R 3 , R 4 for H or C 1 ~C 20 of alkyl.

[0045] Wherein the preparation of compound A comprises the following steps:

[0046] Step S111, adding 2-amino-5-nitroaniline to thionyl chloride (SOCl 2 ), add pyridine dropwise while stirring (the structural formula is Molecular formula is C 5 h 5 N,), wherein the solid-to-liquid ratio of 2-amino-5-nitroaniline to pyridine is 3mol:40ml, then heated to 80°C-90°C for reflux reaction for 24 hours, then remove excess thionyl chloride, add after cooling Precipitate with deionized water, collect the solid, wash it and dry it in vacuum to obtain 5-nitro-2,1,3 benzothiadiazole.

[0047] The reaction formula of this step is:

[0048]...

Embodiment 1

[0095] This example discloses poly{2,2'-bithiophene-6,7-bis(3,7-dimethyl)octyl-benzo[2,1-e:3,4-e] with the following structural formula Bis(benzothiadiazole)} (containing bidithiophene-benzobis(benzothiadiazole) copolymer P1):

[0096]

[0097] The preparation process of the above-mentioned bidithiophene-benzobis(benzothiadiazole) copolymer P1 is as follows:

[0098] 1.1. Preparation of compound 5-nitro-2,1,3 benzothiadiazole

[0099]

[0100] Add 2-amino-5-nitroaniline (22.95g, 0.15mol) and 100ml of thionyl chloride into a three-necked flask, stir and slowly add 2ml of pyridine dropwise, heat and then reflux at 80-90°C for 24 hours to stop the reaction , heated to 80°C and rotary evaporated excess SOCl 2 Afterwards, the reaction product was cooled to room temperature, poured into a large amount of water, stirred, filtered, washed with water and then vacuum-dried to obtain 21.7 g of the product 5-nitro-2,1,3-benzothiadiazole with a yield of 80%.

[0101] 1.2. Preparat...

Embodiment 2

[0124] This example discloses poly{4,4'-didecyl-2,2'-bidithiophene-6,7-bis(3,7-dimethyl)octyl-benzo[2, 1-e:3,4-e] bis(benzothiadiazole)} (containing dithiophene-benzobis(benzothiadiazole) copolymer P2):

[0125]

[0126] The preparation process of the above-mentioned bidithiophene-benzobis(benzothiadiazole) copolymer P2 is as follows:

[0127] 2.1, 4,9-dibromo-6,7-bis(3,7-dimethyl)octyl-benzo[2,1-e:3,4-e]bis(benzothiadiazole) Prepare with embodiment 1.

[0128] 2.2. Preparation of 4,4'-didecyl-5,5'-bis(tributyltin base)-2,2'-dithiophene

[0129]

[0130] Under the protection of nitrogen, add 4,4'-didecyl-5,5'-dibromo-2,2'-dithiophene (6.05g, 0.01mol) into the three-necked flask, add 80ml of tetrahydrofuran solvent, Slowly inject n-butyllithium (8.4mL, 2.5M) with a syringe at -78°C, continue stirring for 1h, and inject tributyltin chloride (5.6mL, 0.02mol) with a syringe at -78°C ), was warming up to room temperature and stirred for 6 hours after reacting for 1 hour. ...

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Abstract

The invention discloses a copolymer containing bithiophene-benzobis(benzothiadiazole). The copolymer is represented by a formula, which is shown in the description; wherein in the formula, the R1 and R2 individually represent a C1-C20 alkyl group, the R3 and R4 individually represent H or C1-C20 alkyl group, and n is an integer in a range of 1 to 100. The energy gap of the copolymer is narrow. The invention also provides a preparation method of the copolymer, solar cell devices and organic electroluminescent devices using the copolymer.

Description

technical field [0001] The invention relates to a bidithiophene-benzobis(benzothiadiazole) copolymer, a preparation method thereof and a solar cell device using the bidithiophene-benzobis(benzothiadiazole) copolymer and organic electroluminescent devices. Background technique [0002] The energy issue is a major issue of great concern to all countries in the world. Solar energy is the most ideal alternative energy source for humans in the future, and solar cells that convert solar energy into electrical energy are also research hotspots. Conjugated polymer thin film solar cells emerging in recent years have outstanding advantages such as low cost, light weight, simple manufacturing process, and can be prepared into flexible devices. In addition, organic materials are diverse and highly designable, promising to improve the performance of solar cells through material design and optimization. [0003] The benzothiadiazole unit has excellent reduction reversibility, which is ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G61/12H01L51/46H01L51/54C07D513/04C07D519/00
CPCY02E10/549
Inventor 周明杰管榕黎乃元黄佳乐李满园
Owner OCEANS KING LIGHTING SCI&TECH CO LTD
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