Simple sol–gel assisted spin coating technique was used to prepare cobalt-doped TiO₂ films for the application of dye-sensitized solar cells (DSSC). TiO₂ photo-electrodes with few Co concentrations (0, 0.025, 0.05, 0.075 and 0.1 M) were prepared on conducting glass substrates. The morphology, structure and composition of the Co:TiO₂ films were observed using SEM, XRD and EDAX analysis. The average crystallite size of Co:TiO₂ nanoparticles obtained from diffractograms are in the range of 3–12 nm. The transformation of polymorphs from anatase to rutile and vice versa for the increasing concentrations of Co in TiO₂ films is observed. The values of optical bandgap energy for Co-doped films are observed to be higher than the pure TiO₂ film and the highest is for the dopant level of 0.025 M. Doping of 0.1 M Co in TiO₂ enhances the power conversion efficiency of DSSC by 65% compared to pure TiO₂ film, demonstrating the influence of Co doping on the functioning of DSSC.

中文翻译：

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Co掺杂的TiO 2纳米粒子的多晶型物转变：一种用于染料敏化太阳能电池的有效光电极

简单的溶胶-凝胶辅助旋涂技术用于制备钴掺杂的TiO ₂薄膜，用于染料敏化太阳能电池（DSSC）的应用。在导电玻璃基板上制备了具有少量Co浓度（0、0.025、0.05、0.075和0.1 M）的TiO ₂光电电极。使用SEM，XRD和EDAX分析观察了Co：TiO ₂薄膜的形貌，结构和组成。由衍射图获得的Co：TiO ₂纳米颗粒的平均微晶尺寸在3-12 nm范围内。随着TiO ₂中Co浓度的增加，多晶型物从锐钛矿转变为金红石，反之亦然电影被观察到。光学带隙能量的共掺杂膜中的值被观察到比纯的TiO更高₂膜和最高为0.1M的钴0.025 M.兴奋剂以TiO掺杂级别_2个增强了DSSC的能量转换效率与纯TiO ₂薄膜相比，其含量为65％，这说明了Co掺杂对DSSC功能的影响。