辛氧基苯基取代的吡啶并[3,4-b]吡嗪染料的合成与光伏性能研究  

Synthesis and Photovoltaic Performance of (Octyloxyphenyl)pyrido-[3,4-b]pyrazine-based Sensitizers for Dye-sensitized Solar Cells

作　　者：张晓瑜[1] 应伟江[1] 武文俊[1] 李晶[1] 花建丽[1] 

机构地区：[1]华东理工大学结构可控先进功能材料与制备实验室和精细化工研究所,上海200237

出　　处：《化学学报》2015年第3期272-280,共9页Acta Chimica Sinica

基　　金：国家自然科学基金(Nos.21372082;2116110444;21172073;21302055)资助~~

摘　　要：为了进一步提高电池的开路电压,把吡啶并吡嗪核上的甲氧基苯换成辛氧基苯,设计合成了一系列以三苯胺为给体、辛氧基苯取代的吡啶并[3,4-b]吡嗪为辅助受体、噻吩(呋喃、苯)为π-链、氰基乙酸为受体的新型染料敏化剂(OPP-I^III).对OPP-I^III的光电化学性质、器件性能以及电荷转移动力学等进行了系统的测试及研究.实验结果表明,用辛氧基取代甲氧基,能有效减少染料在TiO2表面的聚集,同时能阻止电解质和TiO2导带的接触,抑制电荷复合,提高了开路电压.最后,在AM1.5(100mW·cm-2)光强条件下,OPP-I敏化的电池最大光电转换效率为6.57%(短路电流为11.7mA·cm-2,开路电压为717mV,填充因子为0.78).Dye-sensitized solar cell(DSSC) is one of the promising technologies for the alternative to traditional siliconbased solar cells due to its ecological and economical fabrication processes. As one of the key components of a DSSC, the sensitizers have been demonstrated to be extremely important in determining the photoelectric conversion efficiency and device stability of DSSCs. In our previous study, a series of new pyrido[3,4-b]pyrazine-based organic sensitizers(PP-I and APP-I^IV) containing different donors and π-bridges have been synthesized and employed successfully in DSSCs. However, despite their remarkable stability, all of the devices exhibited quite low open-circuit voltages(Vocs), which is adverse to the solar-to-electric power conversion efficiency(η). Therefore, to address this, we have replaced the 2,3-bis(4-methoxyphenyl)pyrido[3,4-b]pyrazine(APP) with 2,3-bis-(4-(octyloxy)phenyl)pyrido[3,4-b]pyrazine(OPP). As a result, a series of new sensitizers(OPP-I^III) has been designed and synthesized with triphenylamine as the electron donor, OPP as the auxiliary acceptor, thiophene, furan and benzene as the π-linker, and cyanoacrylic acid as the acceptor moiety. Their optical and electrochemical properties, device performance and charge transfer kinetics were measured and studied. Compared with APP-III, which has the highest Voc in the previous work, the Vocs of DSSCs based on OPP-I and OPP-III have indeed been improved. Results showed that the replacement of the methoxy group with an octyloxy group can effectively reduce the π-π aggregation of the dyes on TiO2 films. Moreover, the steric hindrance of the octyloxy group successfully suppressed charge recombination and improved the open-circuit voltage. DSSCs based on OPP-III with benzene as the π-linker have higher Voc than that of its counterparts with thiophene and furan as the π-linker, which might be ascribed to the bigger dihedral angle between benzene and OPP unit. In the end, DSSCs based on OPP-I showed the best conversion efficiency of 6.57%(J

关 键 词：吡啶并[3 4-b]吡嗪 辛氧基苯 染料 染料敏化太阳电池 

分 类 号：TM914.4[电气工程—电力电子与电力传动]