Mesoscopic nitrogen-doped TiO₂ spheres for quantum dot-sensitized solar cells

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• 作者：Ting Shu ; Peng Xiang ; Zi-Ming Zhou ; Heng Wang ; Guang-Hui Liu ; Hong-Wei Han ; ^{hongwei.han@mail.hust.edu.cn} ; Yuan-Di Zhao ; ^{zydi@mail.hust.edu.cn}
• 关键词：TiO2 ; Spheres ; Nitrogen-doped ; Quantum dot-sensitized solar cell
• 刊名：Electrochimica Acta
• 出版年：2012
• 期刊代码：30_00134686
• 类别：ch
• 出版时间：30 April, 2012
• 卷：68
• 期：Complete
• 页码：166-171
• 文件大小：938 K

摘要

The photovoltaic performance of quantum dot-sensitized solar cell (QDSSC) based on mesoscopic nitrogen-doped TiO₂ spheres prepared by solvothermal method was investigated. The results indicate that CdSe_xS_(1鈭?em>x)/CdSe QDSSC based on this mesoscopic nitrogen-doped TiO₂ spheres shows an energy conversion efficiency of 3.67%, which is higher than that of the undoped TiO₂ spheres (2.14%). The electrochemical impedance spectroscopy shows retards charge recombination is occurred on nitrogen-doped TiO₂ spheres photoanode. The improvement of the photovoltaic performance of QDSSC could be attributed to the retarding charge recombination, the acceleration of the transfer rate of electrons, higher quantum dots loading and enhanced light scattering in the N-doped TiO₂ spheres film. A higher photovoltaic performance could be expected for other QDSSC with this N-doped TiO₂ sphere material.