Side-Chain Architectures of 2,7-Carbazole and Quinoxaline-Based Polymers for Efficient Polymer Solar Cells
Side-Chain Architectures of 2,7-Carbazole and Quinoxaline-Based Polymers for Efficient Polymer Solar Cells
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DOI：
10.1021/ma102783d
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发表时间：
2011-03
期刊：
影响因子：
5.5
通讯作者：
Ergang Wang;Lintao Hou;Zhongqiang Wang;Zaifei Ma;Stefan Hellström;Wenliu Zhuang;Fengling Zhang;
中科院分区：
文献类型：
--
作者：
Ergang Wang;Lintao Hou;Zhongqiang Wang;Zaifei Ma;Stefan Hellström;Wenliu Zhuang;Fengling Zhang;
为了研究侧链对其光伏性能的影响，设计合成了三种侧链不同但具有共同咔唑并噻吩喹恶啉主链的聚合物。对它们的光物理、电化学和光伏性能进行了研究和比较。具有最多侧链的聚合物EWC3在开路电压(V-oc)为0.92V时表现出最高的功率转换效率，为3.7%。原子力显微镜对器件有源层的图像表明，溶剂和加工添加剂的选择对器件的形貌有很大影响。值得注意的是，由EWC3制成的聚合物太阳能电池(PSCs)，在咔唑单元上具有支化侧链，比由EWC1制成的器件具有更高的V-oc，后者具有与EWC3相同的缺电子部分，但在咔唑单元上具有直的侧链。本研究为高性能PSCs中2，7-咔唑类聚合物的设计提供了重要的指导思想。
Three polymers bearing a common carbazole thiophene quinoxaline thiophene backbone, but different side chains, were designed and synthesized in order to investigate the effect of side chains on their photovoltaic performance. Their photophysical, electrochemical, and photovoltaic properties were investigated and compared. The polymer EWC3, with the largest amount of side chains, showed the highest power conversion efficiency of 3.7% with an open-circuit voltage (V-oc) of 0.92 V. The atomic force microscopy images of the active layers of the devices showed that the morphology was highly influenced by the choice of the solvent and processing additive. It is worth noting that polymer solar cells (PSCs) fabricated from EWC3, with branched side chains on the carbazole units, gave a much higher V-oc than the devices made from EWC1, which bears the same electron-deficient segment as EWC3 but straight side chains on carbazole units. This study offered a useful and important guideline for designing 2,7-carbazole-based polymers for high-performance PSCs.