BaTiO₃/TiO₂ nanocomposite films with varied amount of BaTiO₃ are fabricated and applied as photoanodes for dye-sensitized solar cells (DSCs) and demonstrated enhanced power conversion efficiency. Ferroelectricity of BaTiO₃ in the film after subjected to a annealing process up to 450 °C is examined by Switching Spectroscopy Piezoresponse Force Microscopy (SSPFM). The highest performance is achieved in 1.0 wt% BaTiO₃ addition as a result of increased photocurrent density (J _sc) and fill factor (FF), regardless of reduction of dye-loading. Electrochemical impedance spectroscopy (EIS) measurements at different bias voltages (≦V _oc) in dark suggest that ferroelectric dipole induced electric field has positive effects on enhancing electron mobility and suppressing charge recombination. Although more detailed experiments are needed in designing of the nanocomposite films for compensating characteristics of dye-loading and electron mobility, introduction of ferroelectric dipole induced electric field into the photoanode would be a good strategy in achieving further improvement of power conversion efficiency of DSCs through improved charge transfer properties.

中文翻译：

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染料敏化太阳能电池中铁电BaTiO3偶极诱导的电荷转移增强

制备了具有不同数量的BaTiO _3的BaTiO ₃ / TiO ₂纳米复合薄膜，并将其用作染料敏化太阳能电池（DSC）的光阳极，并证明了提高的功率转换效率。通过切换光谱压电响应力显微镜（SSPFM），对退火至450℃以下的膜中的BaTiO _3的铁电性进行了研究。由于增加了光电流密度（J _sc）和填充因子（FF），因此无论添加多少染料，都可以在1.0 wt％的BaTiO _3中获得最高的性能。电化学阻抗谱（EIS）在不同偏置电压（≦V _oc）在黑暗中表明铁电偶极子感应电场对增强电子迁移率和抑制电荷复合具有积极作用。尽管在设计纳米复合膜以补偿染料负载和电子迁移率特性方面需要进行更详细的实验，但将铁电偶极子感应电场引入光电阳极将是通过改进DSC来进一步提高功率转换效率的一个好策略。电荷转移性质。