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Li and Na in diamond: A comparison of DFT models

机译:钻石中的锂和钠:DFT模型的比较

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Interstitial Li and Na have been suggested as alternatives for achieving shallow n-type doping of diamond. Experimental results have however been contradictory. We report ab initio density functional theory modeling of Li and Na in diamond and compare results using periodic pseudopotential plane wave, and all-electron APW + lo methods together with finite clusters using Gaussian basis sets. We show that although interstitial Li and Na are likely to behave as shallow donors, interstitial Li readily diffuses and it is energetically favorable for interstitial Li and Na to be trapped at existing vacancies in diamond. The resulting substitutional centers are not only passivated but also compensate other interstitial Li and Na donors. Na is shown to be incorporated in diamond as a substitutional acceptor, consistent with experimental observations. (C) 2007 Elsevier B.V. All rights reserved.
机译:已经提出间隙Li和Na作为实现金刚石的浅n型掺杂的替代物。然而,实验结果是矛盾的。我们报告了钻石中Li和Na的从头算密度函数理论建模,并使用周期伪势平面波,全电子APW + lo方法以及使用高斯基集的有限簇比较了结果。我们显示,尽管间隙Li和Na可能表现为浅的供体,但间隙Li容易扩散,并且在能量上有利于间隙Li和Na被困在钻石中的现有空位上。产生的取代中心不仅被钝化,而且补偿其他间隙的Li和Na供体。与实验观察结果一致,Na被显示为作为替代受体掺入钻石中。 (C)2007 Elsevier B.V.保留所有权利。

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