Spectroscopic evidences of synergistic co-sensitization in dye-sensitized solar cells via experimentation of mixture design

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• 作者：Chien-Hsin Yang ; Pei-Yu Chen ; Wen-Janq Chen ; Tzong-Liu Wang ; Yeong-Tarng Shieh
• 关键词：Dye-sensitized solar cell ; Co-sensitization ; Experimental design of mixture ; Synergistic effect ; Antagonistic effect.
• 刊名：Electrochimica Acta
• 出版年：2013
• 出版时间：30 September, 2013
• 年：2013
• 卷：107
• 期：Complete
• 页码：170-177
• 全文大小：2210 K

文摘

A systematic analysis for mixed dyes of D131, D149, and N3 ternary components on performance of dye-sensitized solar cells (DSSCs) has been performed. Using an experimental design of mixture, empirical models are fitted and plotted as contour diagrams, which facilitate revealing the synergistic/antagonistic effects between these mixed dyes. Dye co-sensitization effects in DSSCs are proved by the photo-physic properties, efficiency of the DSSC devices, and kinetic parameters of photo-electron transfer. The performance of DSSCs is significantly affected by the composition of dyes. The optimal efficiency (ca. 9.5 % ) of these mixed-dye DSSCs exists at the composition of 1/2 D149-1/2 N3. This composition appears to help conveying the charge transfer from the excited dye molecules to the conduction band of TiO₂, leading to a higher efficiency of the assembled devices. Supplementary study of the electrochemical impedance are in support of enhancing charge transfer of TiO₂ (e^?) with the co-sensitized dyes.