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Korean Chemical Engineering Research,
Vol.56, No.4, 447-452, 2018
Vol.56, No.4, 447-452, 2018
티타니아 나노튜브를 이용한 염료감응 태양전지
Titania Nanotube-based Dye-sensitized Solar Cells
HF, NaF, NH4F와 같이 플루오르 이온(F-)이 함유된 전해질에서 티타늄 금속판을 양극산화시켜 0.34 μm부터 최대 8.9 μm까지 다양한 길이의 티타니아 나노튜브(TNT)를 제조하였다. 양극산화에 의해 제조된 TNT를 450 °C에서 소성시키면 광 활성을 가지는 아나타제 결정이 생성되었다. TNT 기반 염료감응 태양전지(DSSC)는 TNT 길이가 2.5 μm일 때 광전환 효율이 4.71%로 최대를 나타내었다. 이 값은 티타니아 페이스트를 코팅하여 제작한 FTO 기반 DSSC의 광전환 효율 보다 약 18% 높았다. 또한 TNT-DSSC의 단락전류밀도(Jsc)는 9.74 mA/cm2로 FTO-DSSC의 7.19 mA/cm2 보다 약 35% 이상 높았다. TNT-DSSC 태양전지의 광전환 효율이 더 높은 이유는 염료에서 생성된 광전자가 TNT를 통해 전극 표면으로 빨리 전달되어 광전자와 염료가 재결합 되는 것이 억제되었기 때문이다.
Titanium nanotubes (TNT) of various lengths ranging from 0.34 °C to a maximum of 8.9 °Cwere prepared by anodizing a titanium metal sheet in an electrolyte containing fluorine ion (F-) of HF, NaF and NH4F. When TNT prepared by anodizing was calcined at 450 °C, anatase crystals with photo activity were formed. The TNT-based dye-sensitized solar cell (DSSC) showed a maximum conversion efficiency of 4.71% when the TNT length was 2.5 μm. This value was about 18% higher than photo conversion efficiency of the FTO-based DSSC coated with titania paste. And the short circuit current density (Jsc) of the TNT-DSSC was 9.74 mA/cm2, which was about 35% higher than the 7.19 mA/cm2 of FTO-DSSC. The reason for the higher conversion efficiency of TNT-DSSC solar cells is that photoelectrons generated from dyes are rapidly transferred to the electrode surface through TNT, and the recombination of photoelectrons and dyes is suppressed.
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