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Signature of multilayer growth of 2D layered Bi 2 Se 3 through heteroatom-assisted step-edge barrier reduction
npj 2D Materials and Applications ( IF 9.7 ) Pub Date : 2019-12-20 , DOI: 10.1038/s41699-019-0134-2
Yongsam Kim , Geunsik Lee , Nannan Li , Jikeun Seo , Kwang S. Kim , Namdong Kim

During growth of two-dimensional (2D) materials, abrupt growth of multilayers is practically unavoidable even in the case of well-controlled growth. In epitaxial growth of a quintuple-layered \({{\rm{Bi}}}_{2}{{\rm{Se}}}_{3}\) film, we observe that the multilayer growth pattern deduced from in situ x-ray diffraction implies nontrivial interlayer diffusion process. Here we find that an intriguing diffusion process occurs at step edges where a slowly downward-diffusing Se adatom having a high step-edge barrier interacts with a Bi adatom pre-existing at step edges. The Se–Bi interaction lowers the high step-edge barrier of Se adatoms. This drastic reduction of the overall step-edge barrier and hence increased interlayer diffusion modifies the overall growth significantly. Thus, a step-edge barrier reduction mechanism assisted by hetero adatom–adatom interaction could be fairly general in multilayer growth of 2D heteroatomic materials.



中文翻译:

通过杂原子辅助阶梯边缘势垒还原,二维二维Bi 2 Se 3多层生长的特征

在二维(2D)材料的生长过程中,即使在控制良好的情况下,多层的突然生长实际上也是不可避免的。在五层\({{\ rm {Bi}}} _ {2} {{\ rm {Se}}} _ {3} \)的外延生长中在薄膜中,我们观察到由原位X射线衍射推断出的多层生长模式暗示了非平凡的层间扩散过程。在这里,我们发现有趣的扩散过程发生在台阶边缘,其中具有高台阶边缘势垒的缓慢向下扩散的Se原子与Bi原子预先存在于台阶边缘相互作用。Se-Bi相互作用降低了Se原子的高阶台阶势垒。整体台阶边缘势垒的这种急剧减小,以及由此而增加的层间扩散,显着地改变了整体的增长。因此,在杂化2D杂原子材料的多层生长中,由杂原子-杂原子相互作用辅助的台阶边缘势垒降低机制可能相当普遍。

更新日期:2019-12-20
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