A new organic dye bearing aldehyde electron-withdrawing group for dye-sensitized solar cell
A new organic dye bearing aldehyde electron-withdrawing group for dye-sensitized solar cell
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DOI：
10.1016/j.solener.2012.05.003
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发表时间：
2012-09
期刊：
影响因子：
6.7
通讯作者：
J. Tang;S. Qu;Juan-juan Hu;Wenjun Wu;Jianli Hua
中科院分区：
文献类型：
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作者：
J. Tang;S. Qu;Juan-juan Hu;Wenjun Wu;Jianli Hua
以三苯胺为电子给体，噻吩单元为π共轭桥，醛单元为电子受体，合成了一种新的以二酮基吡咯并吡咯（DPP）为核的无金属染料（I）。为了比较，还合成了相应的含羧基作为吸电子受体的染料II。广泛研究了I和II的吸收光谱、电化学和光伏性质。电化学测量数据表明，HOMO和LUMO能级的调谐可以方便地通过交替电子受体来实现。基于含羧基染料的太阳能电池的短路光电流密度和转换效率比具有羧基作为吸电子锚定基团的太阳能电池更占优势。新敏化剂I表现出光伏性能：短路光电流密度（Jsc）为6.07mAcm−2，开路光电压（Voc）为568mV，填充因子（FF）为0.66，相当于在标准全球AM 1.5太阳光条件下的总转换效率为2.27%。这些工作表明，醛单元作为新型吸电子锚定基团是改善DSSC性能的有希望的候选者。
A new metal-free dye (I) with a diketopyrrolopyrrole (DPP) core was synthesized, in which triphenylamine was used as electron donor, thiophene units as the π-conjugated bridge, aldehyde units as electron acceptor. The corresponding dye II containing carboxy group as the electron-withdrawing acceptor for the purpose of comparison was also synthesized. The absorption spectra, electrochemical and photovoltaic properties of I and II were extensively investigated. Electrochemical measurements data indicate that the tuning of HOMO and LUMO energy levels can be conveniently accomplished by alternating electron acceptor. The short-circuit photocurrent density and conversion efficiency of solar cell based on aldehyde-containing dye is more dominant than that bear a carboxy group as the electron withdrawing anchoring group. The new sensitizer I exhibited a photovoltaic performance: a short-circuit photocurrent density (Jsc) of 6.07mAcm−2, an open-circuit photovoltage (Voc) of 568mV, and a fill factor (FF) of 0.66, corresponding to an overall conversion efficiency of 2.27% under standard global AM 1.5 solar light condition. This work suggests that aldehyde units as new type of electron withdrawing anchoring group are promising candidates for improvement of the performance of DSSCs.