Enhancing electron collection efficiency and effective diffusion length in dye-sensitized solar cells

Daniel Kwan Pang Wong, Chen Hao Ku, Yen Ru Chen, Guan Ren Chen, Jih Jen Wu

Research output: Contribution to journalArticlepeer-review

68 Citations (Scopus)

Abstract

Intensity-modulated photocurrent spectroscopy and intensitymodulated photovoltage spectroscopy are employed to measure the dynamics of electron transport and recombination in the ZnO nanowire (NW) array-ZnO/layered basic zinc acetate (LBZA) nanoparticle (NP) composite dye-sensitized solar cells (DSSCs). The roles of the vertical ZnO NWs and insulating LBZA in the electron collection and transport in DSSCs are investigated by comparing the results to those in the TiO2 - NP, horizontal TiO2 - NW and vertical ZnO-NW-array DSSCs. The electron trans-port rate and electron lifetime in the ZnO NW/NP composite DSSC are superior to those in the conventional TiO 2-NP cell due to the existence of the vertical ZnO NWs and insulating LBZA. It indicates that the ZnO NW/NP composite anode is able to sustain efficient electron collection over much greater thickness than the TiO 2-NP cell does. Consequently, a larger effective electron diffusion length is available in the ZnO composite DSSC.

Original languageEnglish
Pages (from-to)2698-2702
Number of pages5
JournalChemPhysChem
Volume10
Issue number15
DOIs
Publication statusPublished - 2009 Oct 19

All Science Journal Classification (ASJC) codes

  • Atomic and Molecular Physics, and Optics
  • Physical and Theoretical Chemistry

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