An Alternating Copolymer Derived from Indolo[3,2-b]carbazole and 4,7-Di(thieno[3,2-b]thien-2-yl)-2,1,3-benzothiadiazole for Photovoltaic Cells.
An Alternating Copolymer Derived from Indolo[3,2-b]carbazole and 4,7-Di(thieno[3,2-b]thien-2-yl)-2,1,3-benzothiadiazole for Photovoltaic Cells.
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DOI：
10.1002/marc.201000062
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发表时间：
2010-07
影响因子：
4.6
通讯作者：
Yangjun Xia;X. Su;Zhicai He;X. Ren;Hongbin Wu;Yong Cao;Duowang Fan
中科院分区：
文献类型：
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作者：
Yangjun Xia;X. Su;Zhicai He;X. Ren;Hongbin Wu;Yong Cao;Duowang Fan
以5，11-二（9-十七烷基）吲哚并[3，2-B]咔唑和4，7-二（噻吩并[3，2-B]噻吩-2-基）-2，1，3-苯并噻二唑（DTBT）为原料，通过钯催化的Suzuki偶联反应合成了交替窄带隙共轭共聚物（PICZ-DTBT，E（g）= 1.83 eV）。所得聚合物吸收350-690 nm的光，在420和570 nm附近显示两个吸收峰，并具有良好的溶液加工性和热稳定性。循环伏安法测得共聚物的最高占据分子轨道（HOMO）能级和最低未占分子轨道（LUMO）能级分别为-5.18和-3.35 eV。PICZ-DTBT和[6，6]-苯基-C（71）丁酸甲酯（PC（71）BM）固态复合薄膜的原型异质结光伏电池在80 mW · cm（-2）光照下的能量转换效率高达2.4（AM1.5），开路电压为V（oc）= 0.75 V，短路电流密度为J（sc）= 6.02 mA · cm（-2），填充因子为42%。这表明共聚物PICZ-DTBT是用于聚合物太阳能电池的可行的电子供体材料。
An alternating narrow bandgap conjugated copolymer (PICZ-DTBT, E(g) = 1.83 eV) derived from 5,11-di(9-heptadecanyl)indolo[3,2-b]carbazole and 4,7-di(thieno[3,2-b]thien-2-yl)-2,1,3-benzothiadiazole (DTBT), was prepared by the palladium-catalyzed Suzuki coupling reaction. The resultant polymer absorbs light from 350-690 nm, exhibits two absorbance peaks at around 420 and 570 nm and has good solution processibility and thermal stability. The highest occupied molecular orbital (HOMO) energy level and lowest unoccupied molecular orbital (LUMO) level of the copolymer determined by cyclic voltammetry were about -5.18 and -3.35 eV, respectively. Prototype bulk heterojunction photovoltaic cells from solid-state composite films based on PICZ-DTBT and [6,6]-phenyl-C(71) butyric acid methyl ester (PC(71) BM), show power conversion efficiencies up to 2.4% under 80 mW · cm(-2) illumination (AM1.5) with an open-circuit voltage of V(oc) = 0.75 V, a short current density of J(sc) = 6.02 mA · cm(-2) , and a fill factor of 42%. This indicates that the copolymer PICZ-DTBT is a viable electron donor material for polymeric solar cells.