Starburst triarylamine based dyes for efficient dye-sensitized solar cells
Starburst triarylamine based dyes for efficient dye-sensitized solar cells
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DOI：
10.1021/jo800159t
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发表时间：
2008-05-16
影响因子：
3.6
通讯作者：
Tian, He
中科院分区：
文献类型：
--
作者：
Ning, Zhijun;Zhang, Qiong;Tian, He
本文报道了一系列新型星爆型三芳胺类有机染料(S1、S2、S3和S4)的合成、光物理/电化学性质及其在染料敏化纳米二氧化钛太阳能电池(DSC)中的应用。对于所设计的四种染料，星爆三芳胺基团和氰基乙酸分别起到电子供体和电子受体的作用。研究发现，星爆三芳胺基团的引入形成了D-D-pi-A构型，与简单的D-pi-A构型相比，在红致变色吸收光谱、增强的摩尔消光系数和更好的热稳定性方面具有更好的性能。此外，通过改变施主部分可以方便地实现HOMO和LUMO能级的调节，这一点得到了电化学测量和理论计算的证实。基于染料S4的DSC表现出最好的光伏性能：最大单色入射光电转换效率(IPCE)为85%，短路光电流密度(J(Sc))为13.8 mA cm(-2)，开路光电压(V-oc)为0.63V，填充因子(Ff)为0.69，对应于100 mW cm(-)2照射下的总转换效率为6.02%。这项工作表明，基于星爆型三苯胺供体的染料是改善DSSCs性能的有前途的候选者。
We report here on the synthesis and photophysical/electrochemical properties of a series of novel starburst triarylamine-based organic dyes (S1, S2, S3, and S4) as well as their application in dye-sensitized nanocrystalline TiO2 solar cells (DSSCs). For the four designed dyes, the starburst triarylamine group and the cyanoacetic acid take the role of electron donor and electron acceptor, respectively. It was found that the introduction of starburst triarylamine group to form the D-D-pi-A configuration brought about superior performance over the simple D-pi-A configuration, in terms of bathochromically extended absorption spectra, enhanced molar extinction coefficients and better thermo-stability. Moreover, the HOMO and LUMO energy levels tuning can be conveniently accomplished by alternating the donor moiety, which was confirmed by electrochemical measurements and theoretical calculations. The DSSCs based on the dye S4 showed the best photovoltaic performance: a maximum monochromatic incident photon-to-current conversion efficiency (IPCE) of 85%, a short-circuit photocurrent density (J(sc)) of 13.8 mA cm(-2), an open-circuit photovoltage (V-oc) of 0.63 V, and a fill factor (ff) of 0.69, corresponding to an overall conversion efficiency of 6.02% under 100 mW cm(-)2 irradiation. This work suggests that the dyes based on starburst triphenylamine donor are promising candidates for improvement of the performance of the DSSCs.