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arXiv 1502.00309cond-mat.mtrl-sci
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刃型位错对4H-SiC结构和电学性质的影响

Effect of edge dislocations on structural and electric properties of 4H-SiC

Jan Łażewski, Paweł T. Jochym, Przemysław Piekarz, Małgorzata Sternik, Krzysztof Parlinski, Jan Cholewiński, Paweł Dłużewski, Stanisław Krukowski

AI总结:

本文通过第一性原理计算,研究了4H-SiC中刃型位错的结构与电学性质,发现位错核引起局部结构畸变、产生带隙中间能级并显著降低静电势垒。

摘要:

本文利用第一性原理密度泛函理论方法,研究了4H-SiC中两个具有相反伯格斯矢量的全核刃型位错。我们确定了位错形成能随其核间距的变化关系。采用径向分布函数来考察位错对局部晶体结构的强烈影响。电子结构分析揭示了位错核内断键所诱导的带隙中间能级。计算了电荷分布和静电势的分布图,并量化了位错核附近静电势垒的显著降低。所得结果结合现有实验数据进行了讨论。

英文摘要:

The paper presents a study of two full-core, edge dislocations of opposite Burgers vectors in 4H-SiC, conducted using the first-principles density functional theory methods. We have determined the creation energy of the dislocations as a function of distance between their cores. The radial distribution function has been applied to examine strong impact of the dislocations on the local crystal structure. The analysis of the electronic structure reveals mid-gap levels induced by broken atomic bonds in the dislocation core. The maps of charge distribution and electrostatic potential have been calculated and the significant decrease of the electrostatic barriers in the vicinity of the dislocation cores has been quantified. The obtained results have been discussed in the light of available experimental data.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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