Sn-Doped TiO2 Photoanode for Dye-Sensitized Solar Cells

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• 作者：Yandong Duan ; Nianqing Fu ; Qiuping Liu ; Yanyan Fang ; Xiaowen Zhou ; Jingbo Zhang ; Yuan Lin
• 刊名：The Journal of Physical Chemistry C
• 出版年：2012
• 出版时间：April 26, 2012
• 年：2012
• 卷：116
• 期：16
• 页码：8888-8893
• 全文大小：392K
• 年卷期：v.116,no.16(April 26, 2012)
• ISSN：1932-7455

文摘

A series of Sn-doped TiO₂ with Sn content ranging from 0.25 to 1 mol % were successfully synthesized by the hydrothermal method, and its performance as the photoanode of dye-sensitized solar cells (DSSCs) was investigated. TEM and XRD results indicate that the doping has no effect on the morphology and the crystal form of TiO₂. The shift of XRD peaks observed at higher angle and the XPS results indicate Sn⁴⁺ ions incorporation into the TiO₂ lattice. The flatband potential of Sn-TiO₂ films shifts from 鈭?.505 V (vs SCE) to 鈭?.55 V with increasing Sn content from 0 to 1 mol at. %, which is beneficial to the increase of V_oc. The higher transfer rate of electrons in the Sn-doped TiO₂ films than in the undoped TiO₂ films is confirmed by IMPS measurements, which is favorable to the higher J_sc. IMVS and EIS measurements indicate that the charge recombination increases with increasing Sn doping content. Taking these factors, the optimum efficiency of 8.31% was found at 0.5 mol % Sn-doped TiO₂ based DSSCs, which gave an efficiency improved by 12.1% compared with that of the cells based on pure TiO₂ (7.45%). This work shows that Sn-doped TiO₂ is a most interesting material and has good potential for application in photoenergy conversion devices.