摘要:
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1h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1d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覆盖在基底表面,叶片高度（薄膜厚度）约为1.35μm,叶片宽度约为30—80nm,叶片厚度约为10—15nm;经2d制备得到的薄膜厚度约为2.12μm,形貌变化不大.用C106染料敏化纳米TiO2叶片状阵列薄膜电极制作背面照射型染料敏化太阳电池,在辐射强度为100mW·cm-2的模拟太阳光照射下测试,器件获得了3.2%的光电转换效率.相同条件下,以介孔TiO2薄膜电极制备染料敏化太阳电池,利用瞬态光电子衰减和电阻抗技术进行了对比研究,结果表明纳米TiO2叶片状阵列薄膜电极具有电荷复合速率较缓慢和电子寿命较长等特性.
Abstract:
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 1.35μm,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 2.12μm 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.
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