Aryl amine substituted low energy gap carbazole polymers: preparation and photovoltaic properties
Aryl amine substituted low energy gap carbazole polymers: preparation and photovoltaic properties
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DOI：
10.1039/c0jm01335h
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发表时间：
2010-08
影响因子：
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通讯作者：
D. Mohamad;R. G. Johnson;D. Janeliunas;M. Kirkus;Hunan Yi;David G Lidzey;A. Iraqi
中科院分区：
文献类型：
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作者：
D. Mohamad;R. G. Johnson;D. Janeliunas;M. Kirkus;Hunan Yi;David G Lidzey;A. Iraqi
制备了一系列由2,7-链3,6-二甲基-9-芳基氨基-咔唑单元和5,7-二-（噻吩-2-基）-2,3-二苯基-噻吩[3,4-b]吡嗪单元交替组成的供体/受体共聚物。三芳基胺取代基通过对位或间位连接到咔唑重复单元上。本文研究了该系列聚合物中三芳基胺取代基的连接位置的影响以及5,7-二-（噻吩-2-基）-2,3-二苯基-噻吩[3,4-b]吡嗪重复单元中2,3位苯基被烷氧取代的影响。采用核磁共振光谱、紫外-可见吸收光谱和荧光光谱对聚合物进行了表征，并用凝胶渗透色谱法测定了聚合物的分子量。聚合物P1-P4吸收900 nm的光，具有1.37至1.40 eV的能隙。ITO/PEDOT:PSS/P2:PC70BM(1/4, w/w)/Al的光伏电池在白光照射下的开路电压为0.60 V，功率转换效率为0.67%，短路电流为3.6 mA cm−2。
The preparation of a series of donor/acceptor copolymers comprising alternating 2,7-linked 3,6-dimethyl-9-arylamino-carbazole units and 5,7-bis-(thiophen-2-yl)-2,3-diphenyl-thieno[3,4-b]pyrazine units is presented. The triarylamine substituents are attached to the carbazole repeat units either through the para- or meta-positions. The effect of the linkage position of triaryl amine substituents in this series of polymers as well as the effect of substitution of the phenyl groups at the 2,3-positions of 5,7-bis-(thiophen-2-yl)-2,3-diphenyl-thieno[3,4-b]pyrazine repeat units with alkoxy-substituents are investigated in this work. The polymers were characterized by NMR spectroscopy, UV-Vis absorption spectroscopy and fluorescence spectroscopy, and their molecular weights were estimated using gel permeation chromatography. Polymers P1–P4 absorb light up to 900 nm and have energy gaps ranging from 1.37 to 1.40 eV. Photovoltaic cells with ITO/PEDOT:PSS/P2:PC70BM(1/4, w/w)/Al showed an open circuit voltage of 0.60 V under white light illumination, power conversion efficiency of 0.67% and short circuit current of 3.6 mA cm−2.