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首页> 外文期刊>Journal of Materials Chemistry, A. Materials for energy and sustainability >Structural variation of donor-acceptor copolymers containing benzodithiophene with bithienyl substituents to achieve high open circuit voltage in bulk heterojunction solar celIs
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Structural variation of donor-acceptor copolymers containing benzodithiophene with bithienyl substituents to achieve high open circuit voltage in bulk heterojunction solar celIs

机译：含苯并二噻吩和苄基取代基的供体-受体共聚物的结构变化，以在本体异质结太阳能电池中实现高开路电压

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摘要

Three new donor-acceptor copolymers P1, P2, and P3 were synthesized with benzodithiophene with bithienyl substituents as the donor and 5,6-difluorobenzo[c][1,2,5]thiadiazole, 4,7-di(thiophen-2-yl)-benzo[c][1,2,5]thiadiazole, and 5,6-difluoro-4,7-di(thiophen-2-yl)benzo[c][1,2,5]thiadiazole as the acceptors, respectively. The insertion of thiophene spacer between the donor and the acceptor broadened the absorption of the polymers P2 and P3 and resulted in a red shift of ～30 nm as compared to that of the polymer P1. However, the inclusion of fluorine atoms on the polymer had detrimental effects on the photovoltaic properties of the polymers. The synthesized donor-acceptor polymers were tested in bulk heterojunction (BHJ) solar cells with [6,6]-phenyl C_(71) butyric acid methyl ester (PC_(71)BM) acceptor. Polymer P2 gave a PCE of 3.52% with PC71BM in which the active layer was prepared in chloroform with 3% v/v 1,8-diiodooctane (DIO) additive. The effect of fluorine substitution and thiophene group insertion on the UV/Vis absorbance, photovoltaic performances, morphology, and charge carrier mobilities for the polymers are discussed.
机译：合成了三种新的供体-受体共聚物P1，P2和P3，其中带有苯噻吩基取代基的苯并二噻吩和5,6-二氟苯并[c] [1,2,5]噻二唑，4,7-二（噻吩-2- yl）-苯并[c] [1,2,5]噻二唑和5,6-二氟-4,7-二（噻吩-2-基）苯并[c] [1,2,5]噻二唑作为受体， 分别。噻吩间隔基在施主和受主之间的插入扩大了聚合物P2和P3的吸收，与聚合物P1相比，红移约30 nm。然而，在聚合物上包含氟原子对聚合物的光伏性质具有不利影响。在具有[6,6]-苯基C_（71）丁酸甲酯（PC_（71）BM）受体的本体异质结（BHJ）太阳能电池中测试了合成的供体-受体聚合物。聚合物P2与PC71BM的PCE为3.52％，其中活性层是在氯仿中与3％v / v的1，8-二碘辛烷（DIO）添加剂一起制备的。讨论了氟取代和噻吩基团插入对聚合物的UV / Vis吸光度，光伏性能，形态和电荷载流子迁移率的影响。

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