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Crystal electron binding energy and surface work function control of tin dioxide

机译:二氧化锡的晶体电子结合能和表面功函数控制

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摘要

The work function of a material is commonly used as an intrinsic reference for band alignment; however, it is notoriously susceptible to extrinsic conditions. Following the classification of Bardeen we calculate values for the bulk binding energy of electrons in rutile-structured SnO_2 and the effect of the surface on the work function, thus highlighting the role of the surface in determining the energy levels of a material. Furthermore we demonstrate how, through the use of ultrathin heteroepitaxial oxide layers (SiO_2, TiO_2, PbO_2) at the surface, the work function can be tuned to achieve energy levels commensurate with important technological materials. This approach can be extended from transparent conducting oxides to other semiconducting materials.
机译:材料的功函通常用作能带对准的内在参考。但是,它极易受到外部条件的影响。根据Bardeen的分类,我们计算了金红石结构的SnO_2中电子的整体结合能值以及表面对功函的影响,从而突出了表面在确定材料能级中的作用。此外,我们演示了如何通过在表面使用超薄异质外延氧化物层(SiO_2,TiO_2,PbO_2)来调整功函数,以实现与重要技术材料相称的能级。该方法可以从透明导电氧化物扩展到其他半导体材料。

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