A newly designed Nb-doped TiO2/Al-doped ZnO transparent conducting oxide multilayer for electrochemical photoenergy conversion devices

Jun Hong Noh, Hyun Soo Han, Sangwook Lee, Dong Hoe Kim, Jong Hun Park, Sangbaek Park, Jin Young Kim, Hyun Suk Jung, Kug Sun Hong

Research output: Contribution to journalArticle

24 Citations (Scopus)

Abstract

We present dye-sensitized solar cells (DSSCs) employing a thermally and chemically stable Nb-doped TiO2 (NTO)/Al-doped ZnO (AZO) multilayer transparent conducting oxide (TCO) thin film. The NTO overlayer was found to block oxygen diffusion into AZO during the air-annealing process for the fabrication process of the DSSCs, thereby exhibiting good thermal stability in electrical conductivity of the multilayer TCO. Moreover, the NTO overlayer suppressed the formation of Zn2+-dye aggregates at the surface of the AZO. The DSSC employing this multilayer TCO showed a photon to electron conversion efficiency of 3.8% compared to 1.9% for the cell employing the AZO single layer. The optical transmittance and charge transport properties that were measured using electrochemical impedance spectroscopy demonstrate that NTO/AZO is a promising TCO for large scale DSSCs.

Original languageEnglish
Pages (from-to)13867-13871
Number of pages5
JournalJournal of Physical Chemistry C
Volume114
Issue number32
DOIs
Publication statusPublished - 2010 Aug 19
Externally publishedYes

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ASJC Scopus subject areas

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

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