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原生缺陷在化β-Ga2O3中的作用
Hui Zeng1,2, Meng Wu3, Haixia Gao1
1College of Science, Hunan University of Science and Engineering, Yongzhou 425199, China.
Materials (Basel, Switzerland)
|October 28, 2023
概括
研究了氧化 (Ga2O3) 中的铁杂质. 计算显示铁更喜欢八面体的Ga位点,影响导电性和光学特性,对材料设计有影响.
科学领域:
- 材料科学 材料科学 材料科学
- 固态物理 固态物理
- 计算材料科学科学 计算材料科学
背景情况:
- 已知铁 (Fe) 杂质可以在氧化 (Ga2O3) 中补偿n型导电性.
- 关于Fe位点占用及其复合物与Fe-dopedβ-Ga2O3.3中的原生缺陷的关键科学问题仍然存在.
研究的目的:
- 解决关于Fe dopants在β-Ga2O3.3中优先占用位置的争议.
- 研究Fe相关缺陷复合体的形成能量,过渡水平和光学特性.
- 为合成和设计Fe-dopedβ-Ga2O3材料的特性提供指导.
主要方法:
- 第一个原则密度函数理论 (DFT) 运用通用梯度近似 (GGA) 的计算.
- 对形成能量的分析,声子分散关系和应变依赖稳定性的分析.
- 研究缺陷形成能量,电荷过渡水平和缺陷复合物的光学特性.
主要成果:
- 铁剂在β-Ga2O3.3中的八面体协调的Ga位点受到能量偏好.
- 计算的Fe3+/Fe2+过渡水平低于导电带最小值的0.52 eV.
- 在富含氧气的条件下,Fe-doped Ga2O3有利于VGa和Oi缺陷的形成,导致能量有利的FeGaGai和FeGaOi复合体.
- FeGaGai和FeGaVGa复合物增强可见红外区域的光学吸收.
结论:
- 这项研究证实了Fe在β-Ga2O3.3中的八面体Ga位点的优先占用.
- 计算的缺陷特性提供了关于Fe-doped Ga2O3行为和光学特征的见解.
- 这些发现为特定应用的Fe-dopedβ-Ga2O3的合成和性能设计提供了直接指导.
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