Size-tunable TiO₂ nanocrystals from titanium (IV) bis (ammonium lactato) dihydroxide and towards enhance the performance of dye-sensitized solar cells

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• 作者：Yanmin Hao ; Yichuan Rui ; Yaogang Li ; Qinghong Zhang ; Hongzhi Wang
• 关键词：Dye-sensitized solar cells ; Photoanode ; Compact film ; Anatase sol ; Electrochemical impedance spectroscopy
• 刊名：Electrochimica Acta
• 出版年：20 January, 2014
• 年：2014
• 卷：117
• 期：Complete
• 页码：268-275
• 全文大小：5225 K

文摘

Titanium (IV) bis (ammonium lactato) dihydroxide (TALH) was employed to prepare anatase TiO₂ sol where titania in a crystallite size of 3 nm. Both the sol and TALH solution were further subjected to be hydrothermal treated at 200 掳C to grow the crystallite size be most appropriate for the photoanodes of dye-sensitized solar cells (DSSCs). The DSSCs with photoanodes derived from the sol-hydrothermal TiO₂ exhibited the overall energy conversion efficiency (畏) of 7.8%, while the DSSCs with photoanodes derived from the TALH direct hydrothermal (DH) showed a higher 畏 of 8.9%. Moreover, the as-prepared anatase TiO₂ sol prior to the hydrothermal treatment was used as substitute for TiCl₄ solution to modify the porous DH TiO₂ photoanodes, and the DSSCs achieved overall energy conversion efficiency as high as of 9.3%, due to the extremely fine anatase nanocrystals in the TiO₂ sol improved the connection between the TiO₂ nanocrystals more significantly compared to the TiCl₄ treatment.