Surface passivation of nanoporous TiO2 via atomic layer deposition of ZrO2 for solid-state dye-sensitized solar cell applications

Tina C. Li, Márcio S. Góes, Francisco Fabregat-Santiago, Juan Bisquert, Paulo R. Bueno, Chaiya Praslttichal, Joseph T Hupp, Tobin J Marks

Research output: Contribution to journalArticle

123 Citations (Scopus)

Abstract

We report here the utilization of atomic layer deposition to passivate surface trap states in mesoporous TiO2 nanoparticles for solid-state dye-sensitized solar cells based on 2,2',7,7'-tetrak.is(N, N-di-p- methoxyphenylamine)9,9'-spirobifluorene (spiro-OMeTAD). By depositing ZrO 2 films with angstrom-level precision, coating the inesoporous TiO2 produces over a two-fold enhancement in short-circuit current density, as compared to a control device. Impedance spectroscopy measurements provide evidence that the ZrO2 coating reduces recombination losses at the TiO2/spiro-OMeTAD interface and passivates localized surface states. Lowfrequency negative capacitances, frequently observed in nanocomposite solar cells, have been associated with the surface-state mediated charge transfer from TiO2 to the spiro-OMeTAD.

Original languageEnglish
Pages (from-to)18385-18390
Number of pages6
JournalJournal of Physical Chemistry C
Volume113
Issue number42
DOIs
Publication statusPublished - 2009

Fingerprint

Atomic layer deposition
Surface states
atomic layer epitaxy
Passivation
passivity
solar cells
dyes
solid state
Coatings
Short circuit currents
coatings
Charge transfer
Nanocomposites
Solar cells
Current density
Capacitance
control equipment
Spectroscopy
short circuit currents
Nanoparticles

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry
  • Electronic, Optical and Magnetic Materials
  • Surfaces, Coatings and Films
  • Energy(all)

Cite this

Surface passivation of nanoporous TiO2 via atomic layer deposition of ZrO2 for solid-state dye-sensitized solar cell applications. / Li, Tina C.; Góes, Márcio S.; Fabregat-Santiago, Francisco; Bisquert, Juan; Bueno, Paulo R.; Praslttichal, Chaiya; Hupp, Joseph T; Marks, Tobin J.

In: Journal of Physical Chemistry C, Vol. 113, No. 42, 2009, p. 18385-18390.

Research output: Contribution to journalArticle

Li, Tina C. ; Góes, Márcio S. ; Fabregat-Santiago, Francisco ; Bisquert, Juan ; Bueno, Paulo R. ; Praslttichal, Chaiya ; Hupp, Joseph T ; Marks, Tobin J. / Surface passivation of nanoporous TiO2 via atomic layer deposition of ZrO2 for solid-state dye-sensitized solar cell applications. In: Journal of Physical Chemistry C. 2009 ; Vol. 113, No. 42. pp. 18385-18390.
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AU - Bisquert, Juan

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