Room-temperature synthesis of hierarchical nanostructures on ZnO nanowire anodes for dye-sensitized solar cells

Chun Te Wu, Jih-Jen Wu

Research output: Contribution to journalArticlepeer-review

54 Citations (Scopus)

Abstract

A ZnO nanocactus (NC) array is constructed by the chemical bath deposition of hierarchical nanostructures, i.e. shells and spines, on the ZnO nanowire (NW) array at room temperature (RT). By utilizing a supersaturated solution of zinc acetate and NaOH, etch pits are initially formed on the surface of ZnO NWs, where the spines are subsequently developed from. The shell is epitaxially grown on the surface of the primary NW simultaneously. Using the ZnO NC array as the anode of a dye-sensitized solar cell (DSSC), the hierarchical ZnO nanostructures on NWs provide not only larger and more fitting surface for dye adsorption but also faster electron transport pathways compared to the as-prepared ZnO NW anode. Nearly 2-fold enhancement of the efficiency of the ZnO NW DSSC is achieved simply by the formation of the hierarchical nanostructures at RT for 20 min.

Original languageEnglish
Pages (from-to)13605-13610
Number of pages6
JournalJournal of Materials Chemistry
Volume21
Issue number35
DOIs
Publication statusPublished - 2011 Sep 21

All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Materials Chemistry

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