Electrospray preparation of hierarchically-structured mesoporous TiO 2 spheres for use in highly efficient dye-sensitized solar cells

Daesub Hwang; Horim Lee; Sung Yeon Jang; Seong Mu Jo; Dongho Kim; Yongsok Seo; Dong Young Kim

doi:10.1021/am200517v

Electrospray preparation of hierarchically-structured mesoporous TiO ₂ spheres for use in highly efficient dye-sensitized solar cells

Daesub Hwang, Horim Lee, Sung Yeon Jang, Seong Mu Jo, Dongho Kim, Yongsok Seo, Dong Young Kim

Department of Chemistry

Research output: Contribution to journal › Article › peer-review

110 Citations (Scopus)

Abstract

We report a simple method to prepare hierarchically structured TiO ₂ spheres (HS-TiO₂), using an electrostatic spray technique, that are utilized for photoelectrodes of highly efficient dye-sensitized solar cells (DSSCs). This method has an advantage to remove the synthesis steps in conventional sol-gel method to form nano-sized spheres of TiO₂ nanoclusters. The fine dispersion of commercially available nanocrystalline TiO₂ particles (P25, Degussa) in EtOH without surfactants and additives is electro-sprayed directly onto a fluorine-dopoed tin-oxide (FTO) substrate for DSSC photoelectrodes. The DSSCs of HS-TiO ₂ photoelectrodes show high energy conversion efficiency over 10% under illumination of light at 100 mW cm^-2, AM1.5 global. It is concluded from frequency-dependent measurements that the faster electron diffusion coefficient and longer lifetime of HS-TiO₂ than those in nonstructured TiO₂ contribute to the enhanced efficiency in DSSCs.

Original language	English
Pages (from-to)	2719-2725
Number of pages	7
Journal	ACS Applied Materials and Interfaces
Volume	3
Issue number	7
DOIs	https://doi.org/10.1021/am200517v
Publication status	Published - 2011 Jul 27

All Science Journal Classification (ASJC) codes

Materials Science(all)

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10.1021/am200517v

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title = "Electrospray preparation of hierarchically-structured mesoporous TiO 2 spheres for use in highly efficient dye-sensitized solar cells",

abstract = "We report a simple method to prepare hierarchically structured TiO 2 spheres (HS-TiO2), using an electrostatic spray technique, that are utilized for photoelectrodes of highly efficient dye-sensitized solar cells (DSSCs). This method has an advantage to remove the synthesis steps in conventional sol-gel method to form nano-sized spheres of TiO2 nanoclusters. The fine dispersion of commercially available nanocrystalline TiO2 particles (P25, Degussa) in EtOH without surfactants and additives is electro-sprayed directly onto a fluorine-dopoed tin-oxide (FTO) substrate for DSSC photoelectrodes. The DSSCs of HS-TiO 2 photoelectrodes show high energy conversion efficiency over 10% under illumination of light at 100 mW cm-2, AM1.5 global. It is concluded from frequency-dependent measurements that the faster electron diffusion coefficient and longer lifetime of HS-TiO2 than those in nonstructured TiO2 contribute to the enhanced efficiency in DSSCs.",

author = "Daesub Hwang and Horim Lee and Jang, {Sung Yeon} and Jo, {Seong Mu} and Dongho Kim and Yongsok Seo and Kim, {Dong Young}",

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AU - Hwang, Daesub

AU - Lee, Horim

AU - Jang, Sung Yeon

AU - Jo, Seong Mu

AU - Kim, Dongho

AU - Seo, Yongsok

AU - Kim, Dong Young

PY - 2011/7/27

Y1 - 2011/7/27

N2 - We report a simple method to prepare hierarchically structured TiO 2 spheres (HS-TiO2), using an electrostatic spray technique, that are utilized for photoelectrodes of highly efficient dye-sensitized solar cells (DSSCs). This method has an advantage to remove the synthesis steps in conventional sol-gel method to form nano-sized spheres of TiO2 nanoclusters. The fine dispersion of commercially available nanocrystalline TiO2 particles (P25, Degussa) in EtOH without surfactants and additives is electro-sprayed directly onto a fluorine-dopoed tin-oxide (FTO) substrate for DSSC photoelectrodes. The DSSCs of HS-TiO 2 photoelectrodes show high energy conversion efficiency over 10% under illumination of light at 100 mW cm-2, AM1.5 global. It is concluded from frequency-dependent measurements that the faster electron diffusion coefficient and longer lifetime of HS-TiO2 than those in nonstructured TiO2 contribute to the enhanced efficiency in DSSCs.

AB - We report a simple method to prepare hierarchically structured TiO 2 spheres (HS-TiO2), using an electrostatic spray technique, that are utilized for photoelectrodes of highly efficient dye-sensitized solar cells (DSSCs). This method has an advantage to remove the synthesis steps in conventional sol-gel method to form nano-sized spheres of TiO2 nanoclusters. The fine dispersion of commercially available nanocrystalline TiO2 particles (P25, Degussa) in EtOH without surfactants and additives is electro-sprayed directly onto a fluorine-dopoed tin-oxide (FTO) substrate for DSSC photoelectrodes. The DSSCs of HS-TiO 2 photoelectrodes show high energy conversion efficiency over 10% under illumination of light at 100 mW cm-2, AM1.5 global. It is concluded from frequency-dependent measurements that the faster electron diffusion coefficient and longer lifetime of HS-TiO2 than those in nonstructured TiO2 contribute to the enhanced efficiency in DSSCs.

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Electrospray preparation of hierarchically-structured mesoporous TiO ₂ spheres for use in highly efficient dye-sensitized solar cells

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