【摘要】 采用改良Hummers法和微波还原法制备石墨烯,将得到的石墨烯与TiO₂混合,并以此作为阳电极材料组装得到染料敏化太阳能电池（DSSCs）。通过XRD和荧光光谱对所制备的阳电极材料进行表征,并通过伏安曲线和电化学阻抗谱分析电池性能。结果表明,添加石墨烯可提高DSSCs的性能,其原因可归结于添加石墨烯后,阳电极表面吸附和沉积的染料量增加,从而使电池激发态电子数量增多所致。在模拟太阳能光源（AM 1.5）下,当石墨烯添加量为40μL（0.5mg/LmL）时,DSSCs的性能达到最佳。其短路电流、开路电压、填充因子和光电转换效率分别达到10.28、0.68V、47%和3.33%mA/cm²。与以纯TiO₂作阳电极而组装得到的DSSCs的光电转换效率（2.27%）相比,其光电转换效率提高了46.70%。更多还原

【Abstract】 Graphene was prepared by modified Hummers method and microwave reduction route.The got graphene was mixed with TiO₂,and the composite was used as photoanode material to fabricate dye-sensitized solar cells（DSSCs）.The prepared photoanode material was characterized by XRD and fluorescence spectroscopy,and the performance of DSSCs was analyzed by voltage-current curve and electrochemical impedance spectroscopy.The results indicated that the addition of graphene could improve the performance of DSSCs,which was ascribed that the amount of dye adsorbed and deposited on the surface of photoanode increased after adding graphene,thereby increasing the number of excited state electron of DSSCs.Under simulated solar light source（AM 1.5）,the DSSC fabricated with 40μL of graphene（0.5mg/LmL）had optimum performance.Its short-circuit current,open-circuit voltage,fill factor and photoelectric conversion efficiency were10.28（mA/cm²）,0.68 V,47% and 3.33%,respectively.Compared with that of the DSSC fabricated with pure TiO₂（2.27%）,its photoelectric conversion efficiency increased 46.70%.更多还原