title: Hierarchically structured Zn2SnO4 nanobeads for high-efficiency dye-sensitized solar cells.
abstract: We developed a unique strategy for fabricating hierarchically structured (nanoparticles-in-beads) Zn2SnO4 beads (ZTO-Bs), which were then used to produce ternary metal oxide-based dye-sensitized solar cells (DSSCs). DSSCs were fabricated using the ZTO-Bs as the photoelectrodes and highly absorbable organic dyes as the sensitizers. The DSSCs based on the ZTO-Bs and the organic dyes (SJ-E1 and SJ-ET1) exhibited the highest performance ever reported for DSSCs with ternary metal oxide-based photoelectrodes. The optimized DSSCs exhibited a power conversion efficiency of 6.3% (V(OC) of 0.71 V, J(SC) of 12.2 mA cm(-2), FF of 0.72), which was much higher than that for DSSCs with conventional ZTO-NPs-based photoelectrodes or those based on the popular ruthenium-based dye, N719. The unique morphology of the ZTO-Bs allowed for improvements in dye absorption, light scattering, electrolyte penetration, and the charge recombination lifetime, while the organic dyes resulted in high molar absorbability.
authors.affiliation: 1] Department of Chemistry, Yonsei University, Seoul 120-749, Korea [2] Optoelectronic Materials Lab, Korea Institute of Science and Technology, Seoul 136-791, Korea.
authors.forename: Daesub
authors.initials: D
authors.lastname: Hwang
authors.affiliation: Department of Chemistry, Kookmin University, Seoul 136-702, Korea.
authors.forename: Jun-Su
authors.initials: JS
authors.lastname: Jin
authors.affiliation: Optoelectronic Materials Lab, Korea Institute of Science and Technology, Seoul 136-791, Korea.
authors.forename: Horim
authors.initials: H
authors.lastname: Lee
authors.affiliation: Department of Mechanical Engineering, Yonsei University, Seoul 120-749, Korea.
authors.forename: Hae-Jin
authors.initials: HJ
authors.lastname: Kim
authors.affiliation: Department of Chemistry, Yonsei University, Seoul 120-749, Korea.
authors.forename: Heejae
authors.initials: H
authors.lastname: Chung
authors.affiliation: Optoelectronic Materials Lab, Korea Institute of Science and Technology, Seoul 136-791, Korea.
authors.forename: Dong Young
authors.initials: DY
authors.lastname: Kim
authors.affiliation: Department of Chemistry, Kookmin University, Seoul 136-702, Korea.
authors.forename: Sung-Yeon
authors.initials: SY
authors.lastname: Jang
authors.affiliation: Department of Chemistry, Yonsei University, Seoul 120-749, Korea.
authors.forename: Dongho
authors.initials: D
authors.lastname: Kim