三苯胺双供体类染料敏化剂的合成与性能研究

Study on Syntheses and Performances of Bitriphenylamine-doner Dyes

摘要:

本文选择以氰基乙酸作为电子受体，以苯环，噻吩以及联噻吩作为共轭桥链，分别合成了以一个三苯胺作为电子供体的参比染料ST-1和以两个三苯胺作为电子供体的染料DT-1与DT-2。并用核磁共振、傅里叶红外光谱以及质谱对目标产物的结构进行了表征。考察增加一个三苯胺供体和延长共轭桥链对染料敏化剂的光物理性能、电化学性能和光伏性能的影响。实验结果表明，当增加一个额外的三苯胺供体后，染料的开路电压（Voc）得到明显提高，其中染料DT-1的在可见光区的吸收很弱，电流密度（Jsc）变小，相比之下，在共轭桥链中以联噻吩替换单噻吩后，染料DT-2的在可见光区的吸收明显增强，Jsc增大，表现出最高的光电转化效率3.91%。

Abstract:

Three organic dyes include monotriphenylamine-doner dye ST-1 and bitriphenylamine-doner dyes DT-1, DT-2 were synthesized which contained cyanoacrylic acid moieties as electron acceptors，and benzene or thiophene derivatives as conjugated linker. The structures of the molecules were characterized by means of NMR，FTIR and MS．The effects of increasing the amount of donors and prolonging its conjugated linkers on the photo-physical，electrochemical and photovoltaic properties of the dyes were studied．The results indicate that DT-1 and DT-2 can effectively enhance open-circuit voltage of DSSCs due to increase the amount of triphenylamine donors. But the absorption spectrum of DT-1 is weaker in visible area, which causes a decreasing short-circuit current. However, when thiopene is replaced by bithiophene to construct the conjugated linker, the absorption spectrum of DT-2 becomes stronger in visible section, thus Short-circuit current has been improved remarkably, and exhibit highest power conversion efficiency of 3.91%.