Dye-Sensitized Solar Cells Employing Laser Patterned Counter Electrodes

Title
Dye-Sensitized Solar Cells Employing Laser Patterned Counter Electrodes
Authors
노윤영유기천고민재송오성
Keywords
dye sensitized solar cells; ALD; surface; FESEM; Ru
Issue Date
2013-03
Publisher
대한금속 . 재료학회지; Korean journal of metals and materials
Citation
VOL 51, NO 3, 239-243
Abstract
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.
URI
http://pubs.kist.re.kr/handle/201004/44764
ISSN
17388228
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KIST Publication > Article
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