两步电泳沉积制备TiO2光阳极用于高效染料敏化太阳能电池

采用不同沉积电压制备TiO₂光阳极,研究电压对薄膜沉积速率、厚度和形貌的影响。通过台阶仪、光学照片、扫描电子显微镜(SEM)、电化学交流阻抗谱、开路电压衰减曲线对光阳极和电池进行系统表征,并测试了染料敏化太阳能电池器件的电流密度-电压(J-V)曲线,计算其光电转换效率。结果表明,提高沉积电压时,光阳极薄膜的沉积速率加快,膜厚也增加,但是电压过高时,薄膜会有裂缝和覆盖不全的问题,这会对电池的效率造成负面影响。综合考虑低沉积电压条件下薄膜均匀无裂缝和高沉积电压条件下沉积速率快的优点,采用先30 V电压、后60 V电压的电泳沉积方式来制备光阳极,结果呈现协同效果,既降低了制备时间又得到高质量的薄膜,在无其他修饰的情况下,电池的光电转换效率可以达到7.29%。

Two-step electrophoretic deposition of TiO2 photoanode for highly effective dye-sensitized solar cells

In this work, the influences of electrophoretic voltage on film deposition rate, thickness and morphology were investigated. Photoanodes and dye-sensitized solar cells (DSSC) were characterized by step profiler, optical photograph, scanning electron microscope, electrochemical impedance spectroscopy (EIS) and open-circuit voltage decay (OCVD). Increasing electrophoretic voltage can accelerate deposition rate and increase the final film thickness. However, employing excessively high voltage leads to crack formation and incomplete coverage on FTO, there-by exerting an adverse impact on the efficiency of DSSC devices. By employing a"30 V followed by 60 V"deposition method, which combines the advantages of low and high voltages, photoanodes exhibiting a synergistic effect were successfully fabricated. This approach not only reduces electrophoretic time but also yields films of superior quality, resulting in an impressive device efficiency of 7.29% without any additional modifications.