Influence of TiO2 nanotube morphology and TiCl4 treatment on the charge transfer in dye-sensitized solar cells
- Influence of TiO2 nanotube morphology and TiCl4 treatment on the charge transfer in dye-sensitized solar cells
- 이선홍; 채상윤; 황윤정; 구기갑; 주오심
- Issue Date
- Applied physics. A, Materials science & processing
- VOL 112, 733-737
- Dye-sensitized solar cells (DSSCs) were fabricated
using TiO2 nanoparticles (NPs), TiO2 nanotube arrays
(NTAs), and surface-modified NTAs with a TiCl4 treatment.
The photovoltaic efficiencies of the DSSCs using TiO2 NP,
NTA, and TiCl4-treated NTA electrodes are 4.25, 4.74, and
7.47 %, respectively. The highest performance was observed
with a TiCl4-treated TiO2 NTA photoanode, although in the
case of the latter two electrodes, the amounts of N719 dye
adsorbed were similar and 68 % of that of the NP electrode.
Electrochemical impedance measurements show that
the overall resistance, including the charge–transfer resistance,
was smaller with NTA morphologies than with NP
morphologies. We suggest that a different electron transfer
mechanism along the one-dimensional nanostructure of the
TiO2 NTAs contributes to the smaller charge–transfer resistance,
resulting in a higher short circuit current (Jsc), even at
lower dye adsorption. Furthermore, the TiCl4-treated NTAs
showed even smaller charge–transfer resistance, resulting in
the highest Jsc value, because the downward shift in the conduction
band edge improves the electron injection efficiency
from the excited dye into the TiCl4-treated TiO2 electrodes.
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