Dye-Sensitized Solar Cells Employing Laser Patterned Counter Electrodes
- Dye-Sensitized Solar Cells Employing Laser Patterned Counter Electrodes
- 노윤영; 유기천; 고민재; 송오성
- dye sensitized solar cells; ALD; surface; FESEM; Ru
- Issue Date
- 대한금속 . 재료학회지; Korean journal of metals and materials
- VOL 51, NO 3, 239-243
- In order to enhance the energy conversion efficiency by increasing the surface area of the counter electrode (CE), we employed different
substrates with the flat glass, FTO (fluorine-doped tin oxide), and laser patterned FTO. Ruthenium (Ru) films with thicknesses of 34
and 46 nm were deposited by atomic layer deposition (ALD) on each substrate. In this way, the dye sensitized solar cell (DSSC) device
with an area of 0.45 cm2 with a glass/FTO/blocking layer/TiO2/N719(dye)/electrolyte/Ru/substrate structure was prepared. The
microstructure of the CE was investigated with FE-SEM, and the photovoltaic properties were characterized by cyclic voltammetry (CV),
impedance spectroscopy (EIS), and current-voltage (I-V) measurement. When we assumed the surface morphology as the array of a
pyramid (width 0.24, length 0.24, and height 0.14 μm), we determined the surface area of the substrate of the flat glass, FTO, and laser
patterned FTO as 1.36×108, 2.32×108, and 2.56×108 μ㎡, respectively. CV and impedance results revealed an increase in catalytic
activity and a decrease in interface resistance with increasing Ru thickness and surface area. When the Ru thickness was 34 nm (and
46 nm), the energy conversion efficiency of each substrate was 1.55% (1.96%), 2.62% (2.92%), and 2.95% (3.32%), respectively. These
results suggest that increasing the Ru catalytic layer thickness and surface area of the CE contributed to increasing the efficiency.
Moreover, increasing of surface area through laser patterning was more suitable for increasing the efficiency than the conventional flat
glass, and FTO substrates.
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