金属有机化学气相淀积技术制备GaMnN薄膜材料光学性质研究
Optical properties of GaMnN films grown by metal-organic chemical vapor deposition
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摘要: 研究由MOCVD技术制备的GaMnN外延薄膜光吸收谱.实验发现Mn掺杂后较未掺杂CaN吸收系数在近紫外区增加,在吸收谱低能区1.44 ev附近观察到吸收峰,吸收系数随Mn浓度的增加而增大.实验结果与基于密度泛函理论的第一性原理计算结果一致,结合理论计算分析认为1.44 eV附近的吸收峰源于Mn~(3+)离子e态与t_2态间的带内跃迁~5T_2→~5E.Abstract: Optical absorption spectra for a series of GaMnN samples with different Mn content grown by metal-organic chemical vapor deposition have been investigated. Compared with GaN, the absorption coefficient of Gal., Mn, N increases in the UV region and an absorption peak can be observed near 1.44 eV. In addition, the absorption coefficient increases with the increase of the Mn content. The experimental results are in excellent agreement with theoretical data based on density functional theory. Associated with theoretical data, the absorption peak near 1.44 eV is assigned to ~5T_2→~5E internal transition between the e state and the t_2 state of Mn~(3+) ion.
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