Effects of Porphyrin Substituents and Adsorption Conditions on Photovoltaic Properties of Porphyrin-Sensitized TiO2 Cells

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• 作者：Hiroshi Imahori ; Shinya Hayashi ; Hironobu Hayashi ; Akane Oguro ; Seunghun Eu ; Tomokazu Umeyama ; Yoshihiro Matano
• 刊名：Journal of Physical Chemistry C
• 出版年：2009
• 出版时间：October 22, 2009
• 年：2009
• 卷：113
• 期：42
• 页码：18406-18413
• 全文大小：242K
• 年卷期：v.113,no.42(October 22, 2009)
• ISSN：1932-7455

文摘

A series of meso-tetraphenylzincporphyrins have been prepared to examine the effects of the porphyrin substituents and adsorption conditions on photovoltaic properties of the porphyrin-sensitized TiO₂ cells. The cell performance strongly depended on the linking bridge between the porphyrin core and the TiO₂ surface, the bulkiness around the porphyrin core, and the immersing solvents and times for the porphyrin adsorption. In particular, the high cell performance of the porphyrin-sensitized TiO₂ cells was achieved when protic solvent (i.e., methanol) and short immersing time (0.5−1 h) were used for the conditions of the dye adsorption on TiO₂, which is in sharp contrast with Ru dye-sensitized TiO₂ cells. The highest cell performance was obtained with 5-(4-carboxyphenyl)-10,15,20-tris(2,4,6-trimethylphenyl)porphyrinatozinc(II) as a sensitizer and methanol as an immersing solvent with an immersing time of 1 h: a maximal incident photon-to-current efficiency of 76%, a short circuit photocurrent density of 9.4 mA cm⁻², an open-circuit voltage of 0.76 V, a fill factor of 0.64, and a power conversion efficiency of 4.6% under standard AM 1.5 sunlight. These results will provide basic and valuable information on the development of dye-sensitized solar cells exhibiting a high performance.