Hybrid Carbon Nanotubes鈥揟iO2 Photoanodes for High Efficiency Dye-Sensitized Solar Cells

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• 作者：Kadiatou Therese Dembele ; Gurpreet Singh Selopal ; Caterina Soldano ; Riad Nechache ; Julio Cesar Rimada ; Isabella Concina ; Giorgio Sberveglieri ; Federico Rosei ; Alberto Vomiero
• 刊名：The Journal of Physical Chemistry C
• 出版年：2013
• 出版时间：July 18, 2013
• 年：2013
• 卷：117
• 期：28
• 页码：14510-14517
• 全文大小：462K
• 年卷期：v.117,no.28(July 18, 2013)
• ISSN：1932-7455

文摘

We describe a fast and effective procedure for the preparation of high efficiency hybrid photoanodes for dye-sensitized solar cells (DSCs), based on nanocrystalline TiO₂ with limited addition of multiwall carbon nanotubes (CNTs). The mixing process between CNTs and TiO₂ nanoparticles is almost instantaneous, which makes it feasible for large-scale fabrication. Enhanced electron lifetime and reduced charge recombination lead to highly increased short circuit current density and overall photoconversion efficiency (from 13.6 mA cm^鈥? to 16.0 mA cm^鈥? and from 7.0% to 9.0%, respectively, considering the bare TiO₂ and the optimum CNTs concentration, which is 0.010 wt %), while the small reduction in open circuit photovoltage does not significantly affect cell performances. This result is remarkable since a standard dye molecule (N719) was used and no chemical treatments of the photoanodes prior to cell fabrication were applied (i.e., soaking in TiCl₄ to boost open circuit photovoltage).