Electron transport in dye-sensitized solar cells based on zno nanotubes: Evidence for highly efficient charge collection and exceptionally rapid dynamics

Alex B.F. Martinson, Marcio S. Goes, Francisco Fabregat-Santiago, Juan Bisquert, Michael J. Pellin, Joseph T. Hupp

Research output: Contribution to journalArticle

246 Citations (Scopus)

Abstract

Dye-sensitized solar cells based on ordered arrays of polycrystalline ZnO nanotubes, 64 /<ni in length, are shown to exhibit efficient electron collection over the entire photoanode array length. Electrochemical impedance spectroscopy, open-circuit photovoltage decay analysis, and incident-photon-to- current efficiency spectra are used to quantify charge transport and lifetimes. Despite the relatively thick photoanode, the charge extraction time is found to be faster than observed in traditional TiO2 nanoparticle photoanodes. If the extraction dynamics are interpreted as diffusive, effective electron diffusion coefficients of up to 0.4 cm2 s-1 are obtained, making these pseudo-1D photoanodes the fastest reported for an operating DSC to date. Rapid electron collection is of practical significance because it should enable alternative redox shuttles, which display relatively fast electron-interception dynamics, to be employed without significant loss of photocurrent.

Original languageEnglish
Pages (from-to)4015-4021
Number of pages7
JournalJournal of Physical Chemistry A
Volume113
Issue number16
DOIs
Publication statusPublished - Apr 23 2009

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry

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