Yen Yung-Sheng, Indumathi Velu
Center for Nanotechnology, Department of Chemistry, Chung Yuan Christian University, Zhongli 32023, Taiwan.
Polymers (Basel). 2021 Apr 16;13(8):1304. doi: 10.3390/polym13081304.
A series of novel double-anchoring dyes for phenoxazine-based organic dyes with two 2-cyanoacetic acid acceptors/anchors, and the inclusion of a 2-ethylhexyl chain at the nitrogen atom of the phenoxazine that is connected with furan, thiophene, and 3-hexylthiophene as a linker, are used as sensitizers for dye-sensitized solar cells. The double-anchoring dye exhibits strong electronic coupling with TiO, provided that there is an efficient charge injection rate. The result showed that the power conversion efficiency of with thiophene linker-based cell reached 3.80% higher than that of with furan linker (η = 1.53%) under standard illumination. The photovoltaic properties are further tuned by co-adsorption strategy, which improved power conversion efficiencies slightly. Further molecular theoretical computation and electrochemical impedance spectroscopy analysis of the dyes provide further insight into the molecular geometry and the impact of the different π-conjugated spacers on the photophysical and photovoltaic performance.
一系列新型双锚定染料用于基于吩恶嗪的有机染料，该染料具有两个2-氰基乙酸受体/锚定基团，并且在与呋喃、噻吩和3-己基噻吩作为连接基团相连的吩恶嗪氮原子处包含一个2-乙基己基链，用作染料敏化太阳能电池的敏化剂。如果存在有效的电荷注入速率，双锚定染料与TiO表现出强电子耦合。结果表明，在标准光照下，基于噻吩连接基团的电池的功率转换效率达到3.80%，高于基于呋喃连接基团的电池（η = 1.53%）。通过共吸附策略进一步调节光伏性能，这略微提高了功率转换效率。对染料进行进一步的分子理论计算和电化学阻抗谱分析，可进一步深入了解分子几何结构以及不同π共轭间隔基对光物理和光伏性能的影响。
