Preparation Of Quantum Dots Sensitized Solar Cells Based On TiO₂ Nanorods And Their Photovoltaic Characteristic

Quantum dots sensitized solar cells（QDSSCs） as one of the third generation photovoltaic have become a hot topic in photovoltaic field. In this paper, a double-layered TiO₂ flower-rod film and a highly ordered TiO₂ nanorod arrays film were prepared on transparent FTO glasses by a facile hydrothermal method. In situ growth of different quantum dots（QDs） on TiO₂ films were carried out by successive ionic layer adsorption and reaction（SILAR） method to construct QDSSCs. The photovoltaic characteristic of theses QDSSCs were investigated. The main works achieved in this paper are as following:（1） Mn-doped Cd S QDs sensitized TiO₂ flower-rod solar cells were constructed, and photovoltaic performances of the solar cells were investigated. The Mn-dope Cd S QDs and the TiO₂ flower-rod substrate can enhance the photovoltaic performance of the QDSSCs.（2） The TiO₂ flower-rod was used as photoanode in Cd Se/Cd S co-sensitized solar cells. The formation of Cd Se/Cd S co-sensitization system can significantly enhance the power conversion efficiency of the solar cells. In addition, the TiO₂ flower-rod structure also has a positive effect on the improvement of the photovoltaic performance.（3） Vertically oriented one-dimensional TiO₂ nanorod arrays was synthesized directly on transparent fluorine-doped tin oxide（FTO） conducting glass substrate by a facile hydrothermal method and was applied as photoanode in Cd Se/Mn-doped Cd S QDSSCs. The effect of SILAR cycles of QDs on the photovoltaic performance was investigated. The results showed that the combination of Mn-doped Cd S（10） and Cd Se（9） are better for the improvement of power converision efficiency.（4） TiO₂ nanorod arrays film with high aspect ratio was synthesized by a facile two-step hydrothermal process, and was used as substrate in Cd Se/Cd S/Pb S QDSSCs. The ordered TiO₂ nanorods with the increased internal surface areas can adsorb more QDs, which enhanced the ability of light absorption. In addition, the introduction of Pb S as underlayer in Cd Se/Cd S/TiO₂ system can extend the optical absorption range, which greatly enhanced the power conversion efficiency of the QDSSCs.