Self-Assembled CoS2 Nanocrystal Film as an Efficient Counter Electrode for Dye-Sensitized Solar Cells

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• 作者：Jiarui Jin ; Xuehua Zhang ; Tao He
• 刊名：Journal of Physical Chemistry C
• 出版年：2014
• 出版时间：October 30, 2014
• 年：2014
• 卷：118
• 期：43
• 页码：24877-24883
• 全文大小：454K
• ISSN：1932-7455

文摘

In pursuit low-cost and facile synthesis of counter electrode (CE) material as an alternative to expensive Pt for dye-sensitized solar cells (DSSCs), a new procedure for preparing CEs without any postannealing treatment is reported by using a self-assembly technique to obtain a stable thin film as the CE in DSSCs. The self-assembled CoS₂ film is prepared via a facile two-step approach, which shows high electrocatalytic activity on the I^{鈥?/sup>/I₃鈥?/sup> redox reaction. A maximum power conversion efficiency of 6.78% is achieved for the DSSC based on the resultant CoS₂ nanocrystal CE, which is close to that of the cell using a Pt CE (7.38%) under the same condition. Moreover, the flexible device based on a CoS₂ CE exhibits an efficiency of 6.40%. The results indicate that the self-assembled CoS₂ nanoctrystal film may replace the expensive Pt CE for DSSC application, especially for the large-scale flexible devices.}