Microwave-Assisted Synthesis of SnO2 Nanosheets Photoanodes for Dye-Sensitized Solar Cells

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• 作者：Yajie Wang ; Jianjun Tian ; Chengbin Fei ; Lili Lv ; Xiaoguang Liu ; Zhenxuan Zhao ; Guozhong Cao
• 刊名：Journal of Physical Chemistry C
• 出版年：2014
• 出版时间：November 13, 2014
• 年：2014
• 卷：118
• 期：45
• 页码：25931-25938
• 全文大小：387K
• ISSN：1932-7455

文摘

SnO₂ nanosheets were synthesized using microwave-assisted hydrothermal growth and used as photoanodes for dye-sensitized solar cells (DSCs) and demonstrated much better photoelectrical energy conversion performance than that of SnO₂ synthesized with traditional hydrothermal growth, due to a significant decrease in charge diffusion distance and charge recombination. The crystallinity and microstructure of the samples were investigated by means of X-ray diffraction (XRD), scanning, and transmission electron microscopy (SEM/TEM). The specific surface area and pore size distribution were determined by means of nitrogen sorption isotherms. The interfacial charge transfer process and the charge recombination were characterized by electrochemical impedance spectrum (EIS) and intensity modulated photocurrent/photovoltage spectra (IMPS/IMVS) measurements. The DSCs assembled with SnO₂ nanosheets as photoanodes from microwave-assisted synthesis exhibited much enhanced energy conversion efficiency, which is attributed to a higher open-circuit voltage due to less charge recombination, and a large short-circuit current density due to both large surface area and effective light scattering effect.