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首页> 外文期刊>RSC Advances >Band edge movement in dye sensitized Sm-doped TiO2 solar cells: a study by variable temperature spectroelectrochemistry
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Band edge movement in dye sensitized Sm-doped TiO2 solar cells: a study by variable temperature spectroelectrochemistry

机译：染料中的带边缘运动敏化SM掺杂TiO2太阳能电池：可变温度谱电化学研究

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摘要

Pure TiO2 and 8 at% Sm-doped TiO2 nanoparticles are prepared via a novel hydrolysis followed by a hydrothermal process at 473 K for 24 h and successfully used in the photoanode of dye sensitized solar cells (DSSCs). The performance of DSSCs based on 8 at% Sm-doped TiO2 is significantly better compared to DSSCs based on undoped TiO2. The J(SC) is 14.53 mA cm(-2) and eta is 6.78%, which is 15% and 5% higher than that of DSSCs based on undoped TiO2, respectively. The results of a variable temperature spectroelectrochemistry study show that the conduction band edge of 8 at% Sm-doped TiO2 shifts positively. The lower conduction band position enhances the driving force of electrons and improves the electron injection efficiency from the lowest unoccupied molecular orbital (LUMO) of the dye to the conduction band (CB) of TiO2, and the narrower band gap expands the response in the visible region and increases the utilization percentage of sunlight. These all contribute to enhancing the performance of cells based on an 8 at% Sm-doped TiO2 photoanode. The as prepared Sm-doped TiO2 material is proven in detail to be a better photoanode material than pure TiO2.
机译：在％SM掺杂的TiO2纳米颗粒处通过新的水解制备纯TiO2和8，然后在473K下进行24小时，在染料敏化太阳能电池（DSSCs）的光电码中成功使用。与基于未掺杂的TiO2的DSSCS相比，基于8个以0.％的SM掺杂TiO 2的DSSCs的性能显着更好。 j（sc）为14.53 mA cm（-2），ETa分别为3.78％，分别基于未掺杂的TiO2的DSSCS高出15％和5％。可变温度光谱电化学研究的结果表明，8at以％SM掺杂的TiO2的导通带边缘呈正换档。下导带位置增强了电子的驱动力，并将来自染料的最低未占用分子轨道（LumO）的电子注入效率提高到TiO2的导带（CB），并且较窄的带隙扩展了可见的响应地区并增加了阳光的利用率。这些都有助于提高基于8at％的SM掺杂TiO2光电码的细胞的性能。作为制备的SM掺杂的TiO 2材料被详细证明是比纯TiO2更好的光电码材料。

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  • 来源
    《RSC Advances》 |2015年第86期|共10页
  • 作者

    Wei Liguo; Yang Yulin; Xia Xue; Fan Ruiqing; Su Ting; Shi Yan; Yu Jia; Li Liang; Jiang Yanxia;

  • 作者单位

    Harbin Inst Technol Dept Chem Harbin 150001 Peoples R China;

    Harbin Inst Technol Dept Chem Harbin 150001 Peoples R China;

    Harbin Inst Technol Dept Chem Harbin 150001 Peoples R China;

    Harbin Inst Technol Dept Chem Harbin 150001 Peoples R China;

    Harbin Inst Technol Dept Chem Harbin 150001 Peoples R China;

    Harbin Inst Technol Dept Chem Harbin 150001 Peoples R China;

    Harbin Inst Technol Dept Chem Harbin 150001 Peoples R China;

    Harbin Inst Technol Dept Chem Harbin 150001 Peoples R China;

    Harbin Inst Technol Dept Chem Harbin 150001 Peoples R China;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 化学;
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