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% Jsc and a 65% power conversion efficiency enhancement compared with a cell with a flat TiO2 layer for I2-free solid-state dye-sensitized solar cells.
Bibliographical noteFunding Information:
We acknowledge financial support from a National Research Foundation (NRF) grant funded by the Korean government (Ministry of Science, ICT & Future Planning, MSIP) through the Active Polymer Center for Pattern Integration (APCPI) (2007–0056091) and the Pioneer Research Center Program (2010-0019313).
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All Science Journal Classification (ASJC) codes
- Modelling and Simulation
- Materials Science(all)
- Condensed Matter Physics