Novel design of organic donor–acceptor dyes without carboxylic acid anchoring groups for dye-sensitized solar cells
Novel design of organic donor–acceptor dyes without carboxylic acid anchoring groups for dye-sensitized solar cells
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DOI：
10.1039/c3tc32165g
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发表时间：
2014-04
影响因子：
6.4
通讯作者：
T. Michinobu;Norifusa Satoh;Jinhua Cai;Yongrong Li;Liyuan Han
中科院分区：
文献类型：
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作者：
T. Michinobu;Norifusa Satoh;Jinhua Cai;Yongrong Li;Liyuan Han
通过苯胺取代的炔与四氰基乙烯（TCNE）或7，7，8，8-四氰基醌二甲烷（TCNQ）之间的[2 + 2]环加成-逆电环化反应，合成了一种不含羧酸锚定基团的有机给体-受体染料，用于染料敏化太阳能电池（DSSC）。通过紫外可见光谱和红外光谱证实了给受体染料在TiO 2上的有效吸附。DSSC的光伏性能表明，与相应的二甲基苯胺反分子1和2相比，三苯胺衍生物3和4提供更高的电流密度（Jsc）。这主要是由于三苯胺基团具有优异的电荷分离效率和较低的电荷重组率。还发现，由TCNQ加合染料2和4敏化的器件显示出比TCNE加合抗衡染料1和3高的开路电压（Voc）。基于等效电路模型的J-V曲线拟合以及吸收谱和入射光子-电流转换效率（IPCE）谱的比较对上述结果进行了合理的解释。
Organic donor–acceptor dyes, formed by a high-yielding [2 + 2] cycloaddition–retroelectrocyclisation process between aniline-substituted alkynes and tetracyanoethylene (TCNE) or 7,7,8,8-tetracyanoquinodimethane (TCNQ), were employed as novel photosensitizers without carboxylic acid anchoring groups in dye-sensitized solar cells (DSSCs). The efficient adsorption of the donor–acceptor dyes onto TiO2 was confirmed by UV-vis and IR spectroscopies. The photovoltaic performances of the DSSCs suggested that the triphenylamine derivatives 3 and 4 provide higher current densities (Jsc) as compared to the corresponding dimethylaniline counter molecules 1 and 2. This was mainly due to the excellent charge-separation efficiencies and lower charge-recombination rates of the triphenylamine moieties. It was also found that the devices sensitized by the TCNQ-adducted dyes 2 and 4 display open-circuit voltages (Voc) higher than those of the TCNE-adducted counter dyes 1 and 3. All these results were reasonably explained by the J–V curve fitting based on the equivalent-circuit model as well as the comparison between the absorption and incident-photon-to-current-conversion efficiency (IPCE) spectra.