Proceedings of 6th International Conference on Hybrid and Organic Photovoltaics (HOPV14)
Publication date: 1st March 2014
Up to date several groups have demonstrated the benefits of incorporating binary metal-oxide electrodes en-route towards efficient DSSCs.(1-3) Thus the current work aims at realizing efficient indium-zinc-oxide based DSSCs by means of enhancing the charge transport process and significantly reducing the recombination rates. To study the latter, electrochemical impedance spectroscopy (EIS) experiments were performed. EIS results confirm that the presence of low amounts of Indium reduces the charge transport resistance and vastly increases the recombination resistance, resulting in a remarkable enhancement of the charge collection efficiency from 47 to 83 % for devices with ZnO and In0.2Zn0.8O electrodes, respectively. In contrast, electrodes featuring higher amounts of Indium than 15 % show an effective electron trapping that significantly increases the charge transport resistance leading to low charge collection efficiencies. As a matter of fact, our approach leads to a sound enhancement of the device efficiency of over 118% resulting in cells with 4% power conversion efficiency.
Device efficiencies upon increasing the Indium content.
1. Hanhong Chen, Aurelien Du Pasquier, Gaurav Saraf, Jian Zhong, Y. Lu, Semicond. Sci. Technol. 23, 045004 (2008). 2. Khalid Mahmood, S. B. Park, J. Mater. Chem. A 1, 4826 (2013). 3. Sadia Ameen, Shaheer Akhtar, Hyung-Kee Seo, Young Soon Kim, H. S. Shin, Chem. Eng. J. 187, 351 (2012).
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