레이져 식각된 상대전극이 채용된 염료감응태양전지 (Dye-Sensitized Solar Cells Employing Laser Patterned Counter Electrodes)

서지정보

· 발행기관 : 대한금속·재료학회
· 수록지 정보 : 대한금속·재료학회지 / 51권 / 3호 / 239 ~ 243페이지
· 저자명 : 노윤영, 유기천, 고민재, 송오성

초록

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 34and 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 μm2, 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.

영어초록

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 34and 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 μm2, 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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