Conjugated Polymers Based on Dicarboxylic Imide-Substituted Isothianaphthene and Their Applications in Solar Cells
Conjugated Polymers Based on Dicarboxylic Imide-Substituted Isothianaphthene and Their Applications in Solar Cells
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DOI：
10.1002/pola.25021
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发表时间：
2012-01-15
影响因子：
--
通讯作者：
Lam, Yeng Ming
中科院分区：
文献类型：
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作者：
Li, Hairong;Sun, Shuangyong;Lam, Yeng Ming
设计、合成了四种含苯并[c]噻吩基-N-十二烷基-4，5-二羧酰亚胺(DIITN)单元的新型聚合物，包括均聚物和三种给体-受体共聚物。对于这些共聚物，选择具有低禁带宽度的DIITN单元作为电子受体，而5，5‘-(2，7-bisthiophen-2-yl)-9-(2-decyltetradecyl)-9H-carbazole)，5，5’-(3，3‘-di-n-octylsilylene-2，2’-bithiophene)，和5，5‘-(2，7-bisthiophen-2-yl-9，9-bisoctyl-9H-fluoren-7yl)作为电子给体单元，以调节共聚物的最高占据/最低未占据分子轨道(HOMO/LUMO)能级，以获得更好的捕光性能。这些聚合物在可见光和近红外范围内表现出扩展的吸收，并可溶于常见的有机溶剂。这些聚合物的HOMO相对较低，为光伏应用提供了良好的空气稳定性和较高的开路电压(V-oc)。将共聚物与[6，6]-苯基-C61-丁酸甲酯或[6，6]-苯基-C71-丁酸甲酯(PC71BM)共混，制得体相异质结太阳电池。在模拟太阳光AM 1.5g(100 mW/cm(2))和80wt%的PC71BM(含20wt%荧烯共聚物poly[5，5‘-(2，7-bisthiophen-2-yl-9，9-bisoctyl-9H-fluoren-7-yl)-alt-2，9-(benzo[c]thiophene-N-dodecyl-4，5-dicarboxylic酰亚胺)的太阳能电池中，获得了1.6%的最佳功率转换效率，且高开路电压(V-oc)为0.84V。公司J Polym Sci Part A：Polym Chem 50：250-260,2012
Four new polymers containing a benzo[c]thiophene-N-dodecyl-4,5-dicarboxylic imide (DIITN) unit including the homopolymer and three donor-acceptor copolymers were designed, synthesized, and characterized. For these copolymers, DIITN unit with low bandgap was selected as an electron acceptor, whereas 5,5'-(2,7-bisthiophen-2-yl)-9-(2-decyltetradecyl)-9H-carbazole), 5,5'-(3,3'-di-n-octylsilylene-2,2'-bithiophene), and 5,5'-(2,7-bisthiophen-2-yl-9,9-bisoctyl-9H-fluoren-7yl) were chosen as the electron donor units to tune the highest occupied molecular orbital/lowest unoccupied molecular orbital (HOMO/LUMO) levels of the copolymers for better light harvesting. These polymers exhibit extended absorption in the visible and near-infrared range and are soluble in common organic solvents. The relative low lying HOMO of these polymers promises good air stability and high open-circuit voltage (V-oc) for photovoltaic application. Bulk heterojunction solar cells were fabricated by blending the copolymers with [6,6]-phenyl-C61-butyric acid methyl ester or [6,6]-phenyl-C71-butyric acid methyl ester (PC71BM). The best power conversion efficiency of 1.6% was achieved under simulated sunlight AM 1.5G (100 mW/cm(2)) from solar cells containing 20 wt % of the fluorene copolymer poly[5,5'-(2,7-bisthiophen-2-yl-9,9-bisoctyl-9H-fluoren-7-yl)-alt-2,9-(benzo[c]thiophene-N-dodecyl-4,5-dicarboxylic imide)] and 80 wt % of PC71BM with a high open-circuit voltage (V-oc) of 0.84 V. (C) 2011 Wiley Periodicals, Inc. J Polym Sci Part A: Polym Chem 50: 250-260, 2012