Effect of bridging group configuration on photophysical and photovoltaic performance in dye-sensitized solar cells
Effect of bridging group configuration on photophysical and photovoltaic performance in dye-sensitized solar cells
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DOI：
10.1039/c5ta02120k
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发表时间：
2015-06
影响因子：
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通讯作者：
Zhifang Wu;Xin Li;Jing Li;H. Ågren;Jianli Hua;H. Tian
中科院分区：
文献类型：
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作者：
Zhifang Wu;Xin Li;Jing Li;H. Ågren;Jianli Hua;H. Tian
合成了三种基于三芳胺给体2，1，3-苯并噻二唑（BTD）和不同π单元的D-A-π-A构型的无金属有机敏化剂。由于长烷基侧链已连接到与BDT相邻的噻吩上，因此HECA实现了最佳性能。在标准全球AM 1.5太阳光条件下，基于HECA的器件的最佳转换效率为9.13%，Jsc为16.14 mA cm−2，Voc为0.72 V，FF为0.77。虽然EDCA显示出上级光学性质，但它不能给出所需的结果。基于EDCA的器件实现了7.37%的效率，Jsc为15.56 mA cm−2，Voc为0.67 V，FF为0.70。EIS分析证实了EDCA体系中存在快速复合。进一步的计算分析表明EDCA的共面性和对碘分子的很强的亲和力可能是低性能的起源。
Three new metal-free organic sensitizers with a D–A–π–A configuration based on a triarylamine donor, 2,1,3-benzothiadiazole (BTD) and different π units have been synthesized. Because a long alkyl side chain has been attached to the thiophene adjacent to BDT, HECA achieves the best performance. Under standard global AM 1.5 solar light conditions, the HECA based-device gives the best conversion efficiency of 9.13% with a Jsc of 16.14 mA cm−2, a Voc of 0.72 V and a FF of 0.77. Although EDCA displays superior optical properties, it does not give the desired results. The device based on EDCA achieves efficiency of 7.37% with a Jsc of 15.56 mA cm−2, a Voc of 0.67 V and a FF of 0.70. EIS analysis confirms the existence of fast recombination in the EDCA system. Further computational analysis indicates that the coplanarity and the very strong affinity to iodine molecules of EDCA may be the origin of the low performance.