In this study, the zinc oxide (ZnO)-titanium dioxide (TiO₂) composite nanofiber (NF) is prepared and used as an additional layer between TiO₂ layer and electrolyte on the photoanode of dye-sensitized solar cells (DSSC) to improve the power conversion efficiency ( ${\eta }$ ). The various weight ratios of ZnO/TiO₂ in ZnO-TiO₂ NF are manufactured by electrospinning technique. The photovoltaic parameters of DSSC are measured with the solar simulator under air mass 1.5 global (100 mWcm⁻²). The results show that the highest power conversion efficiency of the photoanode modified with ZnO-TiO₂ nanofiber at the weight ratio of ZnO/TiO₂ = 3/97 is 6.33%, which is 16% higher than that of the photoanode without modification. The other photovoltaic parameters such as $\text{J}_{\mathrm{ sc}}$ , $\text{V}_{\mathrm{ oc}}$ , and FF are 12.03 mA cm⁻², 0.79 V, and 0.66, respectively. The incorporation of ZnO allows the electrons to rapidly transfer and inhibit the electron recombination, and also successfully improves power conversion efficiency. The change in impedance between the photoanode and the electrolyte is measured by electrochemical impedance spectroscopy. Improvements in DSSC impedance are related to the decrease of charge recombination.

中文翻译：

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TiO2-ZnO纳米纤维改性光阳极染料敏化太阳能电池的研究

在本研究中，制备了氧化锌 (ZnO)-二氧化钛 (TiO ₂ ) 复合纳米纤维 (NF)，并将其用作染料敏化太阳能电池 (DSSC) 光电阳极上TiO ₂层和电解质之间的附加层，以改善功率转换效率（ ${\eta }$ ）。ZnO-TiO ₂ NF 中不同重量比的 ZnO/TiO ₂是通过静电纺丝技术制造的。DSSC 的光伏参数是在全球空气质量为 1.5 (100 mWcm ^-2 )下用太阳模拟器测量的。结果表明，在ZnO/TiO ₂ = 3/97的重量比下，ZnO-TiO ₂纳米纤维改性的光电阳极的最高功率转换效率为6.33%，比未改性的光电阳极提高了16%。其他光伏参数如 $\text{J}_{\mathrm{ sc}}$ , $\text{V}_{\mathrm{ oc}}$ 和 FF 分别为 12.03 mA cm ^-2、0.79 V 和 0.66。ZnO 的掺入使电子快速转移并抑制电子复合，并成功地提高了功率转换效率。光电阳极和电解质之间的阻抗变化是通过电化学阻抗谱测量的。DSSC 阻抗的改善与电荷复合的减少有关。