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Conjugated polymer prepared by using monothiophene having strong electron-withdrawing group as acceptor

A technology of strong electron-withdrawing groups and conjugated polymers, applied in the field of conjugated polymers and their preparation, can solve the problems of high cost, unfavorable, complex design of acceptor structural units, etc.

Active Publication Date: 2019-12-31
HUZHOU TEACHERS COLLEGE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Conjugated polymer materials with a donor-acceptor structure have been well applied in the photoactive layer. However, the design of some acceptor structural units is extremely complex, resulting in cumbersome synthesis processes and high costs, which are not conducive to the development of industrialization.

Method used

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  • Conjugated polymer prepared by using monothiophene having strong electron-withdrawing group as acceptor
  • Conjugated polymer prepared by using monothiophene having strong electron-withdrawing group as acceptor
  • Conjugated polymer prepared by using monothiophene having strong electron-withdrawing group as acceptor

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Embodiment 1

[0026] Example 1. Preparation of a conjugated polymer with monothiophene bonded to a strong electron-withdrawing group as an acceptor unit

[0027] This example provides 4 kinds of soluble conjugated polymers bonded with strong electron-withdrawing groups, the structural formula of which is shown in Table 1 (wherein, 50>n>20), and its synthetic route can be found in figure 2 .

[0028] Table 1

[0029]

[0030] The preparation method of the conjugated polymer (P1, P2, P3 and P4) containing bonded strong electron-withdrawing groups comprises the following steps:

[0031] (a) Synthesis of benzodithiophene bistin monomer

[0032] The structural formula of intermediate compound A is

[0033] For its detailed preparation method, see the literature "Zhang, G.B.; Fu, Y.Y.; Xie, Z.Y.; Zhang, Q. Synthesis of low bandgap polymer based on 3,6-dithien-2-yl-2,5-dialkylpyrrolo[3,4- c] pyrrole-1, 4-dione for photovoltaic applications. Sol. Energy Mater. Sol. Cells 2011, 95, 1168-...

Embodiment 2

[0048] The ultraviolet absorption spectrum and electrochemical property of embodiment 2, polymer P1, P2, P3 and P4

[0049] image 3 The ultraviolet absorption spectra of polymers P1, P2, P3 and P4 in chloroform (a) and film (b) are given, and the maximum absorption peak positions of conjugated polymers in chloroform solution are at 438nm (P1), 402nm (P2 ), 416nm (P3), 549nm (P4), the maximum absorption peak position of the film is at 436nm (P1), 416nm (P2), 553nm (P3), 612nm (P4), the optical band gap is 1.80eV (P1), 1.88eV (P2), 1.80eV (P3), 1.77eV (P4). Figure 4 Cyclic voltammetry curves for polymers P1, P2, P3 and P4 are given. The cyclic voltammetry test is carried out on the computer-controlled CHI610D telephone line analyzer, using the traditional three-electrode test system, the platinum electrode is the working electrode, the silver / silver ion electrode is the reference electrode, and the electrolyte is tetra-n-butyl hexafluorophosphoric acid Ammonium in acetoni...

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Abstract

The invention discloses a conjugated polymer prepared by using a monothiophene having a strong electron-withdrawing group as an acceptor. A structural formula of the conjugated polymer is representedby a formula (I) shown in the specification, wherein 50>n>20, and R is a structural formula represented by a formula (II), (III), (IV) or (V) shown in the specification. The conjugated polymer is prepared by using the monothiophene bonded with the strong electron-withdrawing group as the acceptor unit and benzodithiophene as a donor unit through a Stille reaction. The main chain of the conjugatedpolymer provided by the invention has a good pi conjugated system, and the side chains contain the strong electron-withdrawing group and a flexible solubilized alkyl chain; and the conjugated polymerinvolved in the invention belongs to low-energy level wide-energy gap polymers which have conjugated main chains and can be treated in a solution.

Description

technical field [0001] The invention relates to a solution-processable low-energy-level wide-bandgap organic semiconductor material, in particular to a conjugated polymer in which a monothiophene bonded with a strong electron-withdrawing group is an acceptor unit and its preparation. Background technique [0002] Organic solar cells are characterized by excellent photoelectric properties of materials, adjustable structural properties, low production costs, simple processing technology, wide range of material selection, convenient property adjustment, easy to make large-area devices, good combination with flexible substrates, moderate bending and The remarkable advantages of twisting without significant improvement in photoelectric performance have attracted more and more scientific research institutions and companies to pay close attention to research. Chemists, physicists, and material scientists have conducted in-depth research on polymer solar cells from the perspectives ...

Claims

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Application Information

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IPC IPC(8): C08G61/12
CPCC08G61/126C08G2261/124C08G2261/1412C08G2261/143C08G2261/149C08G2261/18C08G2261/3243C08G2261/514C08G2261/414Y02E10/549
Inventor 王坤燕郭玉华王永亚徐敏虹唐培松潘国祥曹枫
Owner HUZHOU TEACHERS COLLEGE