含有呋喃衍生物的窄带隙共轭聚合物的合成及光伏性能研究  

Synthesis,Characterization and Photovoltaic Properties of Benzodifuran-containing Low Band Gap Conjugated Polymers

作　　者：殷亮[1,2] 樊本虎[3] 王一丹[1,2] 彭文博[1,2] 赵志国[1,2] 邬俊波[1,2] 

机构地区：[1]中国华能集团清洁能源技术研究院有限公司,北京102209 [2]中国华能集团,北京100031 [3]中国科学院化学研究所,北京100190

出　　处：《高分子学报》2014年第12期1687-1692,共6页Acta Polymerica Sinica

基　　金：中国华能集团科技项目(高效有机太阳能电池研制)(项目号TW-13-HJK-02)资助

摘　　要：通过Stille法将呋喃衍生物苯并二呋喃(BDF)引入共轭主链,合成了苯并二呋喃-呋喃-苯并恶二唑共聚物(Polymer 1,简称P1).以紫外吸收光谱分析了聚合物溶液及其膜的基本光谱特征,通过理论计算进行了分子模拟,并用电化学循环伏安法测定了其基本的电化学性质.采用此材料为给体,PC71BM为受体制备了本体异质结型的有机太阳能电池器件,同时研究了不同给/受体重量比的情况下以及1,8-二碘辛烷作为添加剂的情况下的光伏器件性能.结果表明,P1聚合物在可见光区具有较大吸收.由P1所制得的光伏器件,在AM1.5的模拟太阳光照射条件下最高的转化效率为2.96%,表明BDF基团的引入可实现窄带隙的光电聚合物.A low band gap conjugated polymer（P1） containing benzodifuran（BDF） units was synthesized via Stille coupling polymerization.The polymer exhibited good solubility in common organic solvents（chloroform,chlorobenzene,dichlorobenzene,etc）,excellent film forming properties and wide absorption range in visible region.Density function theory（DFT） studies showed P1 had planar molecular structure,which benefited the arrangement of molecular chain.The molecular weight of P1 was measured by gel permeation chromatography（GPC） and the thermal property was investigated with thermogravimetric analysis（TGA）.A primary bulk heterojunction-typed polymer solar cell was fabricated with the blend of P1 and PC71 BM as the photosensitive layer.The device based on structure of ITO / PEDOT∶ PSS / P1∶ PC71BM（1∶ 1.5,weight ratio,with DIO as additive） / Ca / Al showed an open-circuit voltage（Voc） of 0.80 V,a short circuit current of 5.66 m A/cm2（Jsc）,a fill factor（FF） of 65.14%,and a power conversion efficienct（PCE） of 2.96% under the illumination of AM 1.5,100 m W / cm2.The result shows that the introduction of BDF groups can achieve a low bandgap polymer,and the polymer based on BDF groups has great potential in polymer solar cells.

关 键 词：苯并二呋喃 窄带隙 光伏 共轭聚合物 

分 类 号：O633.5[理学—高分子化学]