Optoelectronic Materials Lab., Korea Institute of Science and Technology, Seoul 136-791, Korea.
ACS Appl Mater Interfaces. 2011 Jul;3(7):2719-25. doi: 10.1021/am200517v. Epub 2011 Jun 17.
We report a simple method to prepare hierarchically structured TiO(2) spheres (HS-TiO(2)), using an electrostatic spray technique, that are utilized for photoelectrodes of highly efficient dye-sensitized solar cells (DSSCs). This method has an advantage to remove the synthesis steps in conventional sol-gel method to form nano-sized spheres of TiO(2) nanoclusters. The fine dispersion of commercially available nanocrystalline TiO(2) particles (P25, Degussa) in EtOH without surfactants and additives is electro-sprayed directly onto a fluorine-dopoed tin-oxide (FTO) substrate for DSSC photoelectrodes. The DSSCs of HS-TiO(2) photoelectrodes show high energy conversion efficiency over 10% under illumination of light at 100 mW cm(-2), AM1.5 global. It is concluded from frequency-dependent measurements that the faster electron diffusion coefficient and longer lifetime of HS-TiO(2) than those in nonstructured TiO(2) contribute to the enhanced efficiency in DSSCs.
我们报告了一种使用静电喷雾技术制备具有分级结构的 TiO(2) 球体 (HS-TiO(2)) 的简单方法，该方法可用于高效染料敏化太阳能电池 (DSSC) 的光电 极。该方法具有去除传统溶胶-凝胶法中形成 TiO(2)纳米团簇纳米级球体的合成步骤的优点。在没有表面活性剂和添加剂的情况下，将市售的纳米晶 TiO(2)颗粒 (P25，Degussa) 在 EtOH 中精细分散，并直接电喷到掺氟氧化锡 (FTO) 基底上，用于 DSSC 光电 极。HS-TiO(2)光电 极的 DSSC 在 100 mW cm(-2)、AM1.5 全球光照下的能量转换效率超过 10%。从频率相关测量中得出结论，HS-TiO(2)的电子扩散系数比非结构化 TiO(2)更快，寿命更长，这有助于提高 DSSC 的效率。
