纳米TiO2叶片状阵列电极的制备及其在染料敏化太阳电池中电子的输运性能

在低温条件下采用定向刻蚀技术, 对金属Ti片表面用H₂O₂溶液进行刻蚀氧化, 制备了垂直生长的纳米TiO₂叶片状阵列薄膜电极. 通过X射线衍射分析表明, 纳米TiO₂叶片状阵列薄膜经500 ℃下烧结1 h后, 从无定型转变为锐钛矿相. 场发射扫描电子显微镜观察表明: 在80 ℃下的H₂O₂溶液刻蚀氧化, 经1 d制备得到的是Ti片表面垂直生长的叶片状阵列, 其形貌均匀且完整地关键词：2')" href="#">纳米TiO₂叶片状阵列电极染料敏化太阳电池电子传输

Preparation of lamina-shape TiO2 nanoarray electrode and its electron transport in dye-sensitized solar cells

Lamina-shape TiO₂ nanoarrays (LTNA) film electrode which is vertically grown on the surface of a Ti sheet by the means of hydrogen peroxide oriented etching at low temperature. X-ray diffraction shows that amorphous phase transforms to highly-crystalline anatase phase of the LTNA film after having been calcined at 500 ℃ for 1 h. Field emission scanning electron microscope exhibits a vertically oriented lamina-shape array with the morphology uniformly distributed and perfectly coated on the surface of Ti sheet, and the average height (film thickness), width and thickness of the leave are 1.35 μm, 30—80 nm and 10—15 nm respectively, after 1 d etching in hydrogen peroxide at 80 ℃. The LTNA electrodes exhibit similar morphologies except for the film with a thickness of 2.12 μm by hydrogen peroxide etching for 2 d. Using the LTNA film electrode as photoanode based on dye C106 fabricate back-illumination type dye-sensitized solar cell (DSC), a power conversion efficiency can reach 3.2% under an irradiation of air mass 1.5 global (100 mW·cm^-2) simulated sunlight. Mesoporous TiO₂ films are also used in the fabrication of DSC under similar conditions. The devices are compared with each other by transient photoelectric attenuation and electrical impedance technique. The results demonstrate that the LTNA-electrode DSC has a much lower recombination rate and a longer electron life time.