Low Bandgap Polymers by Copolymerization of Thiophene with Benzothiadiazole

被引：36

作者：

He, Youjun ^{[1
,2
]}

Wang, Xiang ^{[1
]}

Zhang, Jing ^{[1
,2
]}

Li, Yongfang ^{[1
]}

机构：

[1] Chinese Acad Sci, Beijing Natl Lab Mol Sci, CAS Key Lab Organ Solids, Inst Chem, Beijing 100190, Peoples R China

[2] Chinese Acad Sci, Grad Univ, Beijing 100039, Peoples R China

来源：

MACROMOLECULAR RAPID COMMUNICATIONS | 2009年 / 30卷 / 01期

关键词：

conjugated polymers; D-A copolymers; electrochemistry; low bandgap; PHOTOCURRENT SPECTRAL RESPONSE; INTRAMOLECULAR CHARGE-TRANSFER; SOLAR-CELLS; CONJUGATED POLYMERS; AROMATIC-DONOR; POLYFLUORENE; PERFORMANCE; ELECTROLUMINESCENCE; POLYTHIOPHENES; TRANSPORT;

D O I：

10.1002/marc.200800507

中图分类号：

O63 [高分子化学（高聚物）];

学科分类号：

070305 ; 080501 ; 081704 ;

摘要：

Three low bandgap copolymers of thiophene and benzothiadiazole with electron-donating and electron-withdrawing substituents, P1, P2, and P3, have been synthesized by Pd-catalyzed Stille-coupling. Electronic energy levels of the polymers are estimated by cyclic voltammetry. The polymer films show a broad absorption band in the wavelength range from 300 to 750 nm. can effectively decrease the bandgap of the polymers. Among Me polymers, the polymer that contains the 5,6-dinitrobenzothiadiazole unit, P3, possesses the smallest bandgap of 1.55 eV calculated from its absorption band-edge at approximate to 800 nm. With the increase of the electron-withdrawing ability of the substituents on the benzothiadiazole unit, the energy bandgap of the polymers decreased in the order P1 > P2 > P3. The results indicate that stronger electron-withdrawing substituents on the acceptor unit

引用

页码：45 / 51

页数：7

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