Multi-layering of a nanopatterned TiO2 layer for highly efficient solid-state solar cells

作者：Na Jongbeom; Kim Younghoon; Park Chihyun; Kim Eunkyoung^*

来源：NPG Asia Materials, 2015, 7(9): e217.

DOI：10.1038/am.2015.105

A facile process to prepare multi-layered nanopatterned photoanodes (MNPs) is presented with well-arrayed mesoporous inorganic oxide layers. The MNPs were prepared with multiple stacking of nanopatterned TiO2 layers using a sacrificial polystyrene (PS)-thin film layer, which not only guided the stacking TiO2 layer but also was removed completely by calcination without generating cracks. The prepared MNPs exhibited large enhancement of the light harvesting property by increasing the number of nanopatterned TiO2 layers, through multiple reflection of the incident light from the periodic embedded channels formed between the nanopatterned layers. The photovoltaic efficiency was optimized with a 3-layered nanopatterned photoanode exhibiting a 73% J(sc) and a 65% power conversion efficiency enhancement compared with a cell with a flat TiO2 layer for I-2-free solid-state dye-sensitized solar cells.

• 出版日期2015-9