【摘要】 采用基于密度泛函理论的平面波赝势方法对SnO2:F体系的电子结构进行了第一性原理模拟计算.用广义梯度近似方法优化SnO2:F体系的晶胞结构,计算了体系基态总能.通过确定F掺杂对O的优先替代位置,计算了SnO2:F的能带结构、态密度、分波态密度.分析了F掺杂对SnO2晶体的电子结构和晶体性质及光学吸收边的影响,从理论上得出光学吸收边发生蓝移.对不同掺杂量的体系电子结构进行了分析.更多还原

【Abstract】 The electronic structures of F-doped SnO₂ are calculated by first principles based on density function theory.The cell structures of F-doped SnO₂ are optimized and the result shows that the cell parameters remain unchanged after doping.It is found that there are two nonequivalent oxygen sites in the unit cell where one of corresponding oxygen atom will be preferentially replaced by F atoms.Then,the band structures,density of states,partial density of states of undoped and doped SnO₂ are calculated using plane wave ultra-soft pseudo-potential method.The influence of F-doping on the electronic structure and properties of SnO₂ crystal and the optical absorbtion edge are analyzed.Moreover,the effect of different doping concentration on the electronic structure has been further analyzed.更多还原