Effect of electron-withdrawing side chain modifications on the optical properties of thiophene-quinoxaline acceptor based polymers

被引：28

作者：

Kroon, Renee ^{[1
]}

Lundin, Angelica ^{[1
]}

Lindqvist, Camilla ^{[1
]}

Henriksson, Patrik ^{[1
]}

Steckler, Timothy T. ^{[1
]}

Andersson, Mats R. ^{[1
]}

机构：

[1] Chalmers, Dept Chem & Biol Engn, S-41296 Gothenburg, Sweden

来源：

POLYMER | 2013年 / 54卷 / 04期

基金：

瑞典研究理事会;

关键词：

Conjugated polymers; Side chain modification; Energy level engineering; PI-CONJUGATED POLYMERS; SOLAR-CELLS; PERFORMANCE;

D O I：

10.1016/j.polymer.2013.01.003

中图分类号：

O63 [高分子化学（高聚物）];

学科分类号：

070305 ; 080501 ; 081704 ;

摘要：

Four new thiophene-quinoxaline acceptor based polymers have been synthesized. The parent thiophene-quinoxaline acceptor based copolymer was modified by introducing different electron-withdrawing groups adjacent to the thiophene side group. The effect on the physical, electrochemical and optical properties of the polymer series is discussed with respect to the parent thiophene-quinoxaline acceptor based polymer. The side chain carbonyl from one modified monomer could conveniently be transformed to either a difluoromethylene or an -ylidene malononitrile group via carbonyl transformations. For all polymers incorporating an electron-withdrawing side group both the HOMO and especially the LUMO were significantly shifted away from vacuum while all exhibit enhanced light harvesting ability. Especially the incorporation of an -ylidine malononitrile side group increases both the spectral coverage and absorption coefficient. Incorporation of a difluoromethylene side group resulted in a twofold increase of the molecular weight compared to the parent polymer structure. (c) 2013 Elsevier Ltd. All rights reserved.

引用

页码：1285 / 1288

页数：4

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