Hierarchically structured Zn2SnO4 nanobeads for high-efficiency dye-sensitized solar cells

Daesub Hwang, Jun Su Jin, Horim Lee, Hae Jin Kim, Heejae Chung, Dong Young Kim, Sung Yeon Jang, Dongho Kim

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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% (VOC of 0.71 V, JSC 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.

Original languageEnglish
Article number7353
JournalScientific reports
Volume4
DOIs
Publication statusPublished - 2014 Jan 1

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Hwang, D., Jin, J. S., Lee, H., Kim, H. J., Chung, H., Kim, D. Y., Jang, S. Y., & Kim, D. (2014). Hierarchically structured Zn2SnO4 nanobeads for high-efficiency dye-sensitized solar cells. Scientific reports, 4, [7353]. https://doi.org/10.1038/srep07353