화학공학소재연구정보센터
홈 로그인 로그아웃 연락처 사이트맵
Clean Technology, Vol.20, No.3, 306-313, September, 2014
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Preparationand Characterization of Rutile-anatase Hybrid TiO2 Thin Film by Hydrothermal Synthesis
Soon Jin Kwon, Hoon Sub Song1, Hyo Been Im, Jung Eun Nam2, Jin Kyu Kang2, Taek Sung Hwang3, †, and Kwang Bok Yi4, †
  • Graduate School of Green Energy Technology, Chungnam National University, 99 Daehak-ro, Yuseong-gu, Daejeon 305-764, Korea
  • 1Department of Chemical Engineering, University of Waterloo, 200 University Avenue West, Waterloo, Ontario N2L3G1, Canada, Korea
  • 2Advanced Convergence Research Center, Daegu Gyeongbuk Institute of Science & Technology, 50-1, Sang-ri, Hyeonpung-myeon, Dalseong-gun, Daegu 711-873, Korea
  • 3Department of Chemical Engineering, Chungnam National University, 99 Daehak-ro, Yuseong-gu, Daejeon 305-764, Korea
  • 4Department of Chemical Engineering Education, Chungnam National University, 99 Daehak-ro, Yuseong-gu, Daejeon 305-764, Korea
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Nanoporous TiO2 films are commonly used as working electrodes in dye-sensitized solar cells (DSSCs). So far, there have been attempts to synthesize films with various TiO2 nanostructures to increase the power-conversion efficiency. In this work, vertically aligned rutile TiO2 nanorods were grown on fluorinated tin oxide (FTO) glass by hydrothermal synthesis, followed by deposition of an anatase TiO2 film. This new method of anatase TiO2 growth avoided the use of a seed layer that is usually required in hydrothermal synthesis of TiO2 electrodes. The dense anatase TiO2 layer was designed to behave as the electron-generating layer, while the less dense rutile nanorods acted as electron-transfer pathwaysto the FTO glass. In order to facilitate the electron transfer, the rutile phase nanorods were treated with a TiCl4 solution so that the nanorods were coated with the anatase TiO2 film after heat treatment. Compared to the electrode consisting of only rutile TiO2, the power-conversion efficiency of the rutile-anatase hybrid TiO2 electrode was found to be much higher. The total thickness of the rutile-anatase hybrid TiO2 structures were around 4.5-5.0 μm, and the highest power efficiency of the cell assembled with the structured TiO2 electrode was around 3.94%.
Keywords:TiO2 film;Dye-sensitized solar cells (DSSCs);Rutile-anatase TiO2;Hydrothermal synthesis;TiCl4 treatment
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