首页> 外文期刊>Physical Review, B. Condensed Matter >Divacancy in 3C- and 4H-SiC: An extremely stable defect - art. no. 085202
【24h】

Divacancy in 3C- and 4H-SiC: An extremely stable defect - art. no. 085202

机译:3C-SiC和4H-SiC的离异:极其稳定的缺陷-艺术。没有。 085202

获取原文
获取原文并翻译 | 示例
       

摘要

Using first-principles calculations for divacancy defects in 3 C- and 4H-SiC, we determine their formation energies and stability, their ionization levels, and relaxed geometries (symmetry point groups) for neutral as well as for charged states. For 4H-SiC all four possible, nearest-neighbor divacancy configurations are considered. We find not only a remarkable high binding energy of about 4 eV, but also a strong site dependence (cubic or hexagonal lattice sites) of the formation energies. Applying a Madelung-type correction to deal with the electrostatic interactions between charged supercells, our results indicate a negative-U behavior at E-v + 0.7 eV between the charge states 1 + /1 - only for nearest-neighbor divacancies on different lattice sites (mixed cubic and hexagonal) in 4H-SiC, but not for all the other cases (pure cubic or pure hexagonal) in 4H- or for the cubic divacancy in 3C-SiC. [References: 42]
机译:使用第一原理计算3 C-和4H-SiC中的空位缺陷,我们确定了它们在中性状态和带电状态下的形成能和稳定性,其电离水平以及弛豫的几何形状(对称点组)。对于4H-SiC,考虑了所有四个可能的,最近邻居的空位配置。我们不仅发现了大约4 eV的显着高结合能,而且还发现了形成能具有很强的位点依赖性(立方或六边形晶格位点)。应用马德隆类型校正来处理带电超级电池之间的静电相互作用,我们的结果表明,在荷电状态1 + / 1之间,Ev + 0.7 eV处的负U行为-仅适用于不同晶格位点上的最近邻居空位(混合4H-SiC中的立方晶格和六方晶),但对于4H-SiC中的所有其他情况(纯立方或纯六方晶)或3C-SiC中的立方晶格空位都不适用。 [参考:42]

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱:kefu@zhangqiaokeyan.com

京公网安备:11010802029741号 ICP备案号:京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有
  • 客服微信

  • 服务号