Open AccessFirst principle study on the electron life span of degenerate anatase phase TiO2 semi-conductor with high concentration of oxygen vacancies
Author(s) -
Qingyu Hou,
Yue Zhang,
Tao Zhang
Publication year - 2008
Publication title -
wuli xuebao
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.199
H-Index - 47
ISSN - 1000-3290
DOI - 10.7498/aps.57.3155
Subject(s) - anatase , pseudopotential , materials science , oxygen , density functional theory , electron , phase (matter) , condensed matter physics , vacancy defect , degenerate energy levels , computational chemistry , chemistry , physics , biochemistry , photocatalysis , quantum mechanics , catalysis , organic chemistry
Plane wave ultrasoft pseudopotential technique based on the density functional theory was used to study the effect of high concentration of oxygen vacancies on the electron life span. Using first-principle theory, the structure of anatase TiO2 was optimized, then the state density was calculated. The result showed that at a constant temperature and with high oxygen vacancy concentration, the life span of electrons in anatase TiO2 declines with the increase of the O vacancy concentration, while the electron concentration has no effect on the electron lifes pan. Meanwhile, the Mott phase transformation takes place when the concentration of oxygen vacancies in anatase TiO2 is high.