TITLE

Effective band gap narrowing of anatase TiO2 by strain along a soft crystal direction

AUTHOR(S)
Wan-Jian Yin; Shiyou Chen; Ji-Hui Yang; Xin-Gao Gong; Yanfa Yan; Su-Huai Wei
PUB. DATE
May 2010
SOURCE
Applied Physics Letters;5/31/2010, Vol. 96 Issue 22, p221901
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
Due to its large band gap (3.2 eV), TiO2 cannot absorb sun light effectively. To reduce its band gap, various approaches have been attempted; most of them are using doping to modify its band structure. Using first-principles band structure calculations, we show that unlike the rutile phases, the band gap of TiO2 in the anatase phase can be effectively reduced by applying stress along a soft direction. We propose that this approach of tuning the band gap by applying stress along soft direction of a layered semiconductor is general and should be applicable to other anisotropic materials.
ACCESSION #
51227049

 

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