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Anode resistance reduction of dye-sensitized solar cells using graphene for efficiency improvement

机译：使用石墨烯进行效率改进的阳极抗性太阳能电池的阳极电阻降低

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摘要

In this study, electrochemical impedance spectroscopy of two types of photoanodes made up of TiO_2 and graphene-TiO_2 (with 6 wt% of graphene) composite are investigated in the dye-sensitized solar cells. In the first experiment, a 7-μm thickness of TiO_2 was used as a photoanode. Therefore, the short circuit current (SCC), open circuit voltage (OCV), and efficiency were obtained equal to 6.6 mA, 650 mV, and 3.4%, respectively. Also, the electron lifetime of this experiment in the anode section was obtained 13.2 ms. In the second experiment, graphene-TiO_2 composite with 7-μm thickness was used as a photoanode. Graphene, due to its small energy gap (approximately 0.1 ev), is an appropriate material to absorb more photons. Therefore, more electrons participate in generating SCC. So because of low impedance and high carrier mobility of graphene, electrons can move toward the fluorine-doped tin oxide easily, thus avoiding the recombination of electrons with highest occupied molecular orbital holes, resulting in improved efficiency of about 6.97%. The SCC, OCV, and electron lifetime obtained from the second experiment were obtained equal to 16.29 mA, and 690 mV, and 31 ms, respectively.
机译：在该研究中，在染料敏化太阳能电池中研究了由TiO_2和石墨烯-TiO_2组成的两种类型的光锅（具有6wt％的石墨烯）复合材料的电化学阻抗光谱。在第一次实验中，使用7μm的TiO_2厚度作为光电码。因此，等于6.6mA，650mV和3.4％，获得了短路电流（SCC），开路电压（OCV）和效率。而且，获得了阳极部分中该实验的电子寿命13.2ms。在第二实验中，使用具有7μm厚度的石墨烯-TiO_2复合材料用作光潮。由于其小的能隙（约0.1eV），石墨烯是吸收更多光子的适当材料。因此，更多电子参与生成SCC。因此，由于石墨烯的低阻抗和高载体迁移率，电子可以容易地朝向氟掺杂的氧化锡，因此避免了具有最高占用分子轨道孔的电子的重组，从而提高了约6.97％的效率。从第二实验中获得的SCC，OCV和电子寿命等于16.29mA，690mV和31ms。

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