Diversity of TiO2: Controlling the molecular and electronic structure of atomic layer deposited black TiO2
Research output: Contribution to journal › Article › Scientific › peer-review
|Number of pages||5|
|Journal||ACS Applied Materials & Interfaces|
|Publication status||Published - 4 Jan 2019|
|Publication type||A1 Journal article-refereed|
Visually black, electrically leaky, amorphous titania (am-TiO2) thin films were grown by atomic layer deposition (ALD) for photocatalytic applications. Broad spectral absorbance in the visible range and exceptional conductivity are attributed to trapped Ti3+ in the film. Oxidation of Ti3+ upon heat treatment leads to a drop in conductivity, a color change from black to white, and crystallization of am-TiO2. ALD-grown black TiO2, without any heat treatment, is subject to dissolution in alkaline photoelectrochemical conditions. The best photocatalytic activity for solar water splitting is obtained for completely crystalline white TiO2.