Abstract
ABSTRACTThe transition from anatase to rutile crystalline phase and from continuous to porous morphology was observed by Raman spectroscopy and scanning electron microscopy, respectively, in anodic TiO2 layers as the time of anodization was increased. The mechanism of the PV formation changes from trap- limited PV in thin continuous layers to diffusion PV in thick porous layers. The generation of excess charge carriers and their subsequent separation in space are strongly dependent on the ambience (air, vacuum, water) in porous layers. The importance of polar water molecules for screening of surface ions of porous TiO2 and excess charge carriers separated in space is discussed.
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