Sm-N共掺杂对锐钛矿相TiO_2的电子结构和吸收光谱影响的第一性原理研究

First-principles study on the electronic structures and absorption spectra of Sm-N codoped anatase TiO_2

采用基于密度泛函理论框架下的第一性原理平面波超软赝势方法,建立了N,Sm分别单掺杂以及Sm-N共掺杂的锐钛矿TiO_2超胞模型,对其态密度、能带结构和吸收光谱进行了计算.结果表明:N单掺杂的锐钛矿TiO_2的红移效果最强,但Sm-N共掺杂锐钛矿TiO_2的载流子寿命更长,且共掺杂形成的体系更加稳定.

Based on first principles within density-functional theory, we establish three models of N doped anatase TiO2, Sm doped anatase TiO2 and Sm-N codoped anatase TiO2 by using the plane-wave ultrasoft pseudopotential method. We calculate their densities of states, band structures and absorption spectra. Their results show that although the N doped anatase TiO2 takes the best redshift, the Sm-N codoped anatase TiO2 makes better lifespan of electron and the Sm-N codoped anatase TiO2 is more stable.