Department of Electrical and Computer Engineering, National University of Singapore, Singapore 117576.
ACS Appl Mater Interfaces. 2010 Jul;2(7):1844-50. doi: 10.1021/am100421e.
Mesophase ordering and structuring are carried out to attain optimized pore morphology, high crystallinity, stable porous framework, and crack-free mesoporous titanium dioxide (TiO(2)) films. The pore structure (quasi-hexagonal and lamellar) can be controlled via the concentration of copolymer, resulting in two different types of micellar packing. The calcination temperature is also controlled to ensure a well-crystalline and stable porous framework. Finally, the synthesized mesoporous TiO(2) film is modified by adding P25 nanoparticles, which act as scattering centers and function as active binders to prevent formation of microcracks. Adding P25 nanoparticles into mesoporous structure helps to provide strong light-harvesting capability and large surface area for high -efficiency dye-sensitized solar cells (DSSC). The short-circuit photocurrent density (J(sc)) of the cell made from mixture of mesoporous TiO(2) and P25 nanoparticles displays a higher efficiency of approximately 6.5% compared to the other homogeneous films. A combination of factors such as increased surface area, introduction of light-scattering particles, and high crystallinity of the mesoporous films leads to enhanced cell performance.
介相有序和结构化是为了获得优化的孔形态、高结晶度、稳定的多孔骨架和无裂缝的介孔二氧化钛 (TiO(2)) 薄膜。通过共聚物的浓度可以控制孔结构（准六方和层状），从而产生两种不同类型的胶束组装。还控制煅烧温度以确保具有良好结晶度和稳定的多孔骨架。最后，通过添加 P25 纳米粒子对合成的介孔 TiO(2) 薄膜进行修饰，P25 纳米粒子作为散射中心并作为活性结合剂，以防止微裂纹的形成。将 P25 纳米粒子添加到介孔结构中有助于为高效染料敏化太阳能电池 (DSSC) 提供强的光捕获能力和大的表面积。与其他均匀薄膜相比，由介孔 TiO(2) 和 P25 纳米粒子混合物制成的电池的短路光电流密度 (J(sc)) 显示出约 6.5%的更高效率。表面积增加、引入光散射颗粒和介孔薄膜的高结晶度等因素的结合导致电池性能得到增强。
