Abstract
In this study, the zinc oxide (ZnO)-titanium dioxide (TiO <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sub> ) composite nanofiber (NF) is prepared and used as an additional layer between TiO <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sub> layer and electrolyte on the photoanode of dye-sensitized solar cells (DSSC) to improve the power conversion efficiency (η). The various weight ratios of ZnO/TiO <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sub> in ZnO-TiO <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sub> 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 <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">-2</sup> ). The results show that the highest power conversion efficiency of the photoanode modified with ZnO-TiO <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sub> nanofiber at the weight ratio of ZnO/TiO <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sub> = 3/97 is 6.33%, which is 16% higher than that of the photoanode without modification. The other photovoltaic parameters such as J <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">sc</sub> , V <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">oc</sub> , and FF are 12.03 mA cm <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">-2</sup> , 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.
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