采用密度泛函理论框架下的第一性原理平面波超软赝势方法,在相同环境条件下分别建立了未掺杂和取代O高掺杂N原子的金红石型TiO2超胞模型,优化了晶胞的几何结构,计算了能带分布、态密度分布和吸收光谱.结果表明,金红石型TiO2-xNx超胞取x=0.0625的条件下,N的2p态与O的2p态发生杂化耦合,使其价带上移、最小带隙变窄、吸收光谱发生红移现象,这和实验中高掺杂N原子Ti2-xNx带隙变窄红移现象相吻合.
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