Anatase TiO 2 beads having ultra-fast electron diffusion rates for use in low temperature flexible dye-sensitized solar cells

Chun Ren Ke, Jyh-Ming Ting

Research output: Contribution to journalArticle

25 Citations (Scopus)

Abstract

The first use of mesoporous TiO 2 beads in plastic substrate flexible dye-sensitized solar cell (FDSC) is demonstrated. Pure anatase TiO 2 beads with various sizes (250-750 nm) and characteristics are obtained using a modified and efficient two-step method. The concept of chemical sintering, eliminating the step of additive removal, is used to prepare bead-containing paste for room temperature fabrication of photoanode having good adhesion to the substrate. The obtained photoanodes are examined for their dye loadings and light absorbance properties. Various plastic substrate FDSCs having commercial P25- and bead-containing photoanodes are fabricated and evaluated. The resulting cells are evaluated for the J-V characteristics, electron diffusion time, electron lifetime, charge-collection efficiency, electron-injection efficiency and incident photon-to-electron conversion efficiency. The bead-only cells not only have better efficiencies, as high as ∼5%, but also exhibit ultra-fast electron diffusion rates, less than 1 ms (∼0.37 ms, 7.6 μm). The best efficiency and electron diffusion rates are respectively 15% higher and two-order of magnitude faster than the P25-only cell. The effects of the bead characteristics on the cell performance is presented and discussed.

Original languageEnglish
Pages (from-to)316-321
Number of pages6
JournalJournal of Power Sources
Volume208
DOIs
Publication statusPublished - 2012 Jun 15

Fingerprint

electron diffusion
anatase
beads
Titanium dioxide
solar cells
dyes
Electrons
cells
Substrates
Temperature
Plastics
plastics
Electron injection
Ointments
electrons
Conversion efficiency
Coloring Agents
Sintering
Adhesion
Photons

All Science Journal Classification (ASJC) codes

  • Electrical and Electronic Engineering
  • Energy Engineering and Power Technology
  • Renewable Energy, Sustainability and the Environment
  • Physical and Theoretical Chemistry

Cite this

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abstract = "The first use of mesoporous TiO 2 beads in plastic substrate flexible dye-sensitized solar cell (FDSC) is demonstrated. Pure anatase TiO 2 beads with various sizes (250-750 nm) and characteristics are obtained using a modified and efficient two-step method. The concept of chemical sintering, eliminating the step of additive removal, is used to prepare bead-containing paste for room temperature fabrication of photoanode having good adhesion to the substrate. The obtained photoanodes are examined for their dye loadings and light absorbance properties. Various plastic substrate FDSCs having commercial P25- and bead-containing photoanodes are fabricated and evaluated. The resulting cells are evaluated for the J-V characteristics, electron diffusion time, electron lifetime, charge-collection efficiency, electron-injection efficiency and incident photon-to-electron conversion efficiency. The bead-only cells not only have better efficiencies, as high as ∼5{\%}, but also exhibit ultra-fast electron diffusion rates, less than 1 ms (∼0.37 ms, 7.6 μm). The best efficiency and electron diffusion rates are respectively 15{\%} higher and two-order of magnitude faster than the P25-only cell. The effects of the bead characteristics on the cell performance is presented and discussed.",
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AB - The first use of mesoporous TiO 2 beads in plastic substrate flexible dye-sensitized solar cell (FDSC) is demonstrated. Pure anatase TiO 2 beads with various sizes (250-750 nm) and characteristics are obtained using a modified and efficient two-step method. The concept of chemical sintering, eliminating the step of additive removal, is used to prepare bead-containing paste for room temperature fabrication of photoanode having good adhesion to the substrate. The obtained photoanodes are examined for their dye loadings and light absorbance properties. Various plastic substrate FDSCs having commercial P25- and bead-containing photoanodes are fabricated and evaluated. The resulting cells are evaluated for the J-V characteristics, electron diffusion time, electron lifetime, charge-collection efficiency, electron-injection efficiency and incident photon-to-electron conversion efficiency. The bead-only cells not only have better efficiencies, as high as ∼5%, but also exhibit ultra-fast electron diffusion rates, less than 1 ms (∼0.37 ms, 7.6 μm). The best efficiency and electron diffusion rates are respectively 15% higher and two-order of magnitude faster than the P25-only cell. The effects of the bead characteristics on the cell performance is presented and discussed.

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