Enhanced visible-light absorption in heavily nitrogen-doped TiO2 |
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| Authors: | Q Li J Xue W Liang J-H Huang |
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| Institution: | 1. Department of Materials Science and Engineering , University of Illinois at Urbana-Champaign , Urbana, IL 61801, USA;2. College of Materials Science and Engineering, Taiyuan University of Technology , Taiyuan, 030024, P. R. China;3. Department of Engineering and System Science , National Tsing Hua University , Hsinchu 300, Taiwan |
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| Abstract: | Heavy nitrogen doping of TiO2 thin films has been achieved by ion-beam-assisted deposition. The heavily doped films have a distorted anatase crystal structure and show an increase in visible-light absorption compared to films with only light nitrogen doping. The enhanced absorption is shown by a first-principles density-functional calculation to result from an electronic band-gap narrowing, in contrast to the appearance of isolated N 2p states above the valence-band maximum that occur with light nitrogen doping. |
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