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Investigation of work function and surface energy of aluminum: An ab-initio study

机译:铝的功函数和表面能的研究:从头算

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The work function and surface energy of aluminum with different orientations are investigated by employing the DFT simulation. We mainly focus on two situations: pure aluminum surface and aluminum surface with impurities. The numerical results indicate that the work function of Al (100) is larger than Al (110). With the introduction of the impurities (carbon atoms), the work function increases because of the extra electric dipoles on the surface. We also find that the surface energy of Al (100) is smaller than that of Al (110) indicating that Al (100) surface is more stable. When there are impurities on the surface, the surface energy decreases for silicon impurity and increases for calcium impurity. The magnitude of the increase is related to the orientation of the surface.
机译:通过DFT模拟研究了不同取向的铝的功函数和表面能。我们主要关注两种情况:纯铝表面和带有杂质的铝表面。数值结果表明,Al(100)的功函大于Al(110)。随着杂质(碳原子)的引入,功函数由于表面上多余的电偶极子而增加。我们还发现,Al(100)的表面能小于Al(110)的表面能,表明Al(100)的表面更稳定。当表面上有杂质时,硅杂质的表面能降低,而钙杂质的表面能升高。增加的幅度与表面的方向有关。

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