Diversity of TiO2: Controlling the molecular and electronic structure of atomic layer deposited black TiO2

Ali-Löytty, Harri; Hannula, Markku; Saari, Jesse; Palmolahti, Lauri; Bhuskute, Bela D.; Ulkuniemi, Riina; Nyyssönen, Tuomo; Lahtonen, Kimmo; Valden, Mika (2019-01-04)
 
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Ali-Löytty, Harri
Hannula, Markku
Saari, Jesse
Palmolahti, Lauri
Bhuskute, Bela D.
Ulkuniemi, Riina
Nyyssönen, Tuomo
Lahtonen, Kimmo
Valden, Mika
04.01.2019

ACS Applied Materials & Interfaces
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doi:10.1021/acsami.8b20608
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https://urn.fi/URN:NBN:fi:tty-201906281916

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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.
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