Synthesis of dithieno[2,3-d:2’,3’-d’]benzo[1,2-b:4,5-b’]dithiophene -alt-isoindigo conjugated polymer and enhancement of photovoltaic property with diphenyl sulfide additives
Synthesis of dithieno[2,3-d:2’,3’-d’]benzo[1,2-b:4,5-b’]dithiophene -alt-isoindigo conjugated polymer and enhancement of photovoltaic property with diphenyl sulfide additives
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DOI：
10.1007/s10965-014-0633-y
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发表时间：
2014
影响因子：
2.8
通讯作者：
Yangjun Xia;Heng Zhang;Jianfeng Li;Junfeng Tong;Peng Zhang;Chunyan Yang
中科院分区：
文献类型：
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作者：
Yangjun Xia;Heng Zhang;Jianfeng Li;Junfeng Tong;Peng Zhang;Chunyan Yang
以5.10-二（2-乙基己氧基）二噻吩[2,3-d:2 ',3 ' -d ']并[1,2-b:4,5-b ']二噻吩（DTBDT）和异靛蓝衍生物（ID）为原料合成了一种低带隙交替共轭聚合物。该聚合物在有机溶剂中具有良好的溶解性，在350 ~ 780 nm范围内具有广泛的吸收，最高占据分子轨道（HOMO）能级为−5.38 eV，最低未占据分子轨道（LUMO）能级为−3.80 eV。尽管如此，聚合物和[6,6]-苯基- c71 -丁酸甲酯（PC71BM）共混物的光伏电池（pvc）的功率转换效率（PCE）为0.21%，非常低。有趣的是，当使用极少量的二苯基硫化物（DPS）作为溶剂添加剂时，聚合物与PC71BM （W:W, 1:15 .5）共混而成的聚氯乙烯在100 mW/cm2光照（AM 1.5G）下的PCE最大值为4.43%。
An alternating low band gap conjugated polymer derived from 5.10-di(2-ethylhexyloxy)dithieno[2,3-d:2’,3’-d’]benzo[1,2-b:4,5-b’]dithiophene (DTBDT) and isoindigo derivative (ID), was synthesized and characterized. The polymer exhibits good solubility in organic solvent and extensive absorption from 350 to 780 nm with the highest occupied molecular orbital (HOMO) level of −5.38 eV and lowest unoccupied molecular orbital (LUMO) level of −3.80 eV. In spite of those, the power conversion efficiency (PCE) of 0.21 % for the photovoltaic cells (PVCs) from the blend of the polymer and [6, 6]-phenyl-C71-butyric acid methyl ester (PC71BM) is very low. Interestingly, the performances of the PVCs from the polymer are remarkably increased while a very small amount of diphenyl sulfide (DPS) is used as solvent additives, and the maximal PCE of 4.43 % is achieved in the PVCs from the blend of polymer and PC71BM (W:W, 1:1.5) with DPS as solvent additives under 100 mW/cm2illumination (AM 1.5G).