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首页> 外文期刊>Chemistry: A European journal >Photophysical studies of dipolar organic dyes that feature a 1,3-cyclohexadiene conjugated linkage: The implication of a twisted intramolecular charge-transfer state on the efficiency of dye-sensitized solar cells
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Photophysical studies of dipolar organic dyes that feature a 1,3-cyclohexadiene conjugated linkage: The implication of a twisted intramolecular charge-transfer state on the efficiency of dye-sensitized solar cells

机译：具有1,3-环己二烯共轭键的偶极有机染料的光物理研究：扭曲的分子内电荷转移状态对染料敏化太阳能电池效率的影响

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摘要

A detailed study of the synthesis and photophysical properties of a new series of dipolar organic photosensitizers that feature a 1,3-cyclohexadiene moiety integrated into the ?-conjugated structural backbone has been carried out. Dye-sensitized solar cells (DSSCs) based on these structurally simple dyes have shown appreciable photo-to-electrical energy conversion efficiency, with the highest one up to 4.03%. Solvent-dependent fluorescence studies along with the observation of dual emission on dye 4b and single emission on dyes 4a and 32 suggest that dye 4b possesses a highly polar emissive excited state located at a lower-energy position than at the normal emissive excited state. A detailed photophysical investigation in conjunction with computational studies confirmed the twisted intramolecular charge-transfer (TICT) state to be the lowest emissive excited state for dye 4b in polar solvents. The relaxation from higher-charge-injection excited states to the lowest TICT state renders the back-electron transfer process a forbidden one and significantly retards the charge recombination to boost the photocurrent. The electrochemical impedance under illumination and transient photovoltage decay studies showed smaller charge resistance and longer electron lifetime in 4b-based DSSC compared to the DSSCs with reference dyes 4a and 32, which further illustrates the positive influence of the TICT state on the performance of DSSCs.
机译：已经对新系列的偶极有机光敏剂的合成和光物理性质进行了详细的研究，这些偶极有机光敏剂的特征是将1，3-环己二烯部分整合到β-共轭结构骨架中。基于这些结构简单的染料的染料敏化太阳能电池（DSSC）已显示出可观的光电能量转换效率，最高的可达4.03％。与溶剂有关的荧光研究以及在染料4b上的双发射和在染料4a和32上的单发射的观察表明，染料4b具有比正常发射激发态低的能量位置的高极性发射激发态。结合计算研究的详细光物理研究证实，分子内扭曲的电荷转移（TICT）状态是极性溶剂中染料4b的最低发射激发态。从较高的电荷注入激发态到最低的TICT态的弛豫使反向电子转移过程成为一种禁止的过程，并显着阻碍了电荷复合以增强光电流。在光照和瞬态光电压衰减研究下的电化学阻抗显示，与含参考染料4a和32的DSSC相比，基于4b的DSSC具有更小的充电电阻和更长的电子寿命，这进一步说明了TICT状态对DSSC性能的积极影响。

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