title: Expanding the spectral response of a dye-sensitized solar cell by applying a selective positioning method.
abstract: We have developed a facile method to position different dyes (N719 and N749) sequentially in a mesoporous TiO(2) layer through selective desorption and adsorption processes. From the selective removal of the only upper part of the first adsorbed dye, double-layered dye-sensitized solar cells have been successfully achieved without any damage to the dye. From the incident photon-to-current conversion efficiency (IPCE) measurement, the multi-layered dye-sensitized solar cell (MDSSC) was found to exhibit an expanded spectral response for the solar spectrum while maintaining the maximum IPCE value of each single-layered cell. The highest photocurrent density, 19.3 mA cm( - 2), was obtained from the MDSSC utilizing an N719/N749 bi-layered mesoporous TiO(2) film. The power conversion efficiency of 9.8% was achieved from the MDSSC, which is higher than that of single N719-or N749-based cells and cocktail-dyed (a mixture of N719 and N749) cells.
authors.affiliation: Solar Cell Center, Energy Division, Korea Institute of Science and Technology (KIST), Seoul 136-791, Korea.
authors.forename: Se Woong
authors.initials: SW
authors.lastname: Park
authors.forename: Kyungtae
authors.initials: K
authors.lastname: Lee
authors.forename: Doh-Kwon
authors.initials: DK
authors.lastname: Lee
authors.forename: Min Jae
authors.initials: MJ
authors.lastname: Ko
authors.forename: Nam-Gyu
authors.initials: NG
authors.lastname: Park
authors.forename: Kyungkon
authors.initials: K
authors.lastname: Kim