A new strategy was attempted to fabricate photoelectrode of dye-sensitized solar cells through a reassembly technique (exfoliation and restacking) to increase solar activity. A random hybridization between exfoliated layered titanate and TiO2 (anatase) nanoparticles resulted in a 'house-of-cards' structure, which might increase the mesoporosity and surface area of TiO2 film. In the XRD patterns of the present nanocomposite, no (00 l) peaks could be seen due to the random hybridization between layered titanate and TiO2 nanosol particles. According to the N2 adsorption-desorption isotherms, the resulting nanohybrids are fairly porous with a high specific surface area (SBET=∼190 m2/g, mean pore size=6 nm), which leads to an efficient dye adsorption. A solar energy to electricity conversion efficiency (η) of the present nanocomposite film is about 100 times higher than that of TiO2 nanoparticle one under the standard AM 1.0 irradiation condition, suggesting that the mesoporous nature of TiO2 film would play an important role for efficient photovoltaic cell performance.
Bibliographical noteFunding Information:
This work was supported by the Korean Research Foundation (grant: KRF-2004-041-C00187), and in part by the SRC program of the Korea Science and Engineering Foundation (KOSEF) through the Center for Intelligent Nano-Bio Materials at Ewha Womans University (grant: R11-2005-008-01001-0). The authors are also grateful for the financial support to participate in the international conference by the Science and Technology Amicable Research (STAR) Program of the Ministry of Science and Technology. Authors thank to the Ministry of Education for the Brain Korea 21 fellowship.
All Science Journal Classification (ASJC) codes
- Materials Science(all)
- Condensed Matter Physics