title: Synthesis and characteristics of tb-doped Y2SiO5 nanophosphors and luminescent layer for enhanced photovoltaic cell performance.
abstract: Nanophosphors based on green emitting terbium doped yttrium silicates with the general formula Y2SiO5:Tb3+ with a size of 30-60 nm were synthesized by the hydrothermal method. The prepared nanophosphors were characterized by X-ray diffraction, field-emission scanning electron microscopy, transmission electron microscopy, UV-Vis diffuse reflectance spectroscopy and fluorescence spectroscopy. It was found that the nanophosphors crystallize in an X1-type monoclinic structure (P2(1)/c) and absorb UV light from 220 to 300 nm which they then down-convert into visible-light (strong green emission at around 545 nm (5D4-->7F(J. As TiO2-based dye-sensitized solar cells exhibit their maximum incident photon to current efficiency at around 500-600 nm, the wavelength-modulation characteristics of the nanophosphors can be efficient for dye-sensitized solar cell systems. Therefore, the Y2SiO5:Tb3+ nanophosphors were introduced into a TiO2-based dye-sensitized solar cell and their effects on the performance of the solar cell were investigated.
authors.affiliation: School of Materials Science and Engineering, College of Engineering, Seoul National University, Seoul 151-742, Korea.
authors.forename: Dong Kyun
authors.initials: DK
authors.lastname: Yim
authors.forename: In-Sun
authors.initials: IS
authors.lastname: Cho
authors.forename: Sangwook
authors.initials: S
authors.lastname: Lee
authors.forename: Chae Hyun
authors.initials: CH
authors.lastname: Kwak
authors.forename: Dong Hoe
authors.initials: DH
authors.lastname: Kim
authors.forename: Jung-Kun
authors.initials: JK
authors.lastname: Lee
authors.forename: Kug Sun
authors.initials: KS
authors.lastname: Hong