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Visible light-responsive titanium dioxide thin film prepared by reactive sputtering.

Woon-Jo Jeong¹, In-Seob Moon, Soon-Kye Cho

¹Department of Information Communication, Chosun College University of Science & Technology, 290 Seosuk-dong, Dong-gu, Gwangju 501-744, Korea.

Journal of Nanoscience and Nanotechnology

|April 2, 2011

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Researchers enhanced titanium dioxide (TiO2) photocatalyst efficiency by introducing oxygen vacancies. This defect engineering shifts light absorption into the visible spectrum, improving solar energy utilization.

Area of Science:

Materials Science
Photocatalysis
Semiconductor Physics

Background:

Titanium dioxide (TiO2) is a wide band-gap semiconductor with limited light absorption (approx. 5%) in the UV region.
This narrow absorption spectrum restricts its practical applications due to low solar energy utility and quantum yield.
Enhancing TiO2's light absorption is crucial for broader photocatalytic applications.

Purpose of the Study:

To shift the absorption edge of TiO2 films into the visible spectrum.
To improve the photocatalytic activity of TiO2 by enhancing light utilization.
To engineer impurity levels within the band-gap of TiO2 thin films.

Main Methods:

Fabrication of oxygen-defected TiO2 photocatalyst films using reactive sputtering.

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Controlled variation of Argon (Ar) to Oxygen (O2) partial pressure ratios during sputtering (e.g., 76.7:23.3 to 98.5:1.5).

Characterization of the resulting impurity levels and optical absorption properties.

Main Results:

Introduction of oxygen vacancies created an impurity level within the TiO2 band-gap.
An impurity level of approximately 2.75 eV was achieved at an oxygen partial pressure of 2.9%.
Photocatalytic activity was observed at wavelengths as low as 400 nm, indicating visible light absorption.

Conclusions:

Oxygen-defected TiO2 exhibits enhanced light absorption extending into the visible spectrum.
The engineered impurity level effectively broadens the photo-response of TiO2.
This approach offers a promising strategy for developing more efficient TiO2-based photocatalysts for solar energy applications.