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Effects of dye adsorption on the electron transport properties in ZnO-nanowire dye-sensitized solar cells

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5 Author(s)
Jih-Jen Wu ; Department of Chemical Engineering, National Cheng Kung University, Tainan 701, Taiwan ; Chen, Guan-Ren ; Yang, Hung-Hsien ; Ku, Chen-Hao
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Mercurochrome and N3 dyes are employed to be the sensitizers in the ZnO-nanowire (NW) dye-sensitized solar cells (DSSCs). A lower fill factor is obtained in the N3-sensitized cell which results in comparable efficiencies in both ZnO-NW DSSCs although the N3 molecules possess a wider absorptive range for light harvesting. Electrochemical impedance spectroscopy and open-circuit photovoltage decay measurements are employed to investigate the electron transport properties in both ZnO-NW DSSCs. The results indicate that more abundant electron interfacial recombination occurs in the N3-sensitized ZnO-NW DSSC due to the higher surface trap density in the ZnO-NW photoanode after N3 dye adsorption.

Published in:

Applied Physics Letters  (Volume:90 ,  Issue: 21 )

Date of Publication:

May 2007

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