通过再取向生长单晶PbTe膜
Single-crystalline PbTe film growth through reorientation
摘要：
异质外延使工程的新特性，不存在于单一的材料。两个主要的生长模式被确定为材料的组合与大的晶格失配，沃尔默-韦伯和Stranski-Krastanov。这两种缺陷都导致三维岛的形成，阻碍了平坦无缺陷薄膜的生长。这限制了可行材料组合的数量。在这里，我们报告了一个独特的生长模式，发现在分子束外延碲化铅在InP上发起的预生长表面处理。早期成核形成类似于Volmer-Weber生长模式的岛，但膜封闭具有原子台阶的平坦表面。值得注意的是，尽管在初始岛中发现了多个不同的晶体取向，但最终的膜是单晶的。这是可能的，由于在岛聚结期间发生的重取向过程，促进高质量的异质外延，尽管大的晶格失配，晶体结构的差异和分散的热膨胀系数的PbTe和InP。这种生长模式为异质外延异质材料提供了一种新的策略，并扩展了可能的材料组合的领域。
英文摘要：
Heteroepitaxy enables the engineering of novel properties, which do not exist in a single material. Two principle growth modes are identified for material combinations with large lattice mismatch, Volmer-Weber and Stranski-Krastanov. Both lead to the formation of three-dimensional islands, hampering the growth of flat defect-free thin films. This limits the number of viable material combinations. Here, we report a distinct growth mode found in molecular beam epitaxy of PbTe on InP initiated by pre-growth surface treatments. Early nucleation forms islands analogous to the Volmer-Weber growth mode, but film closure exhibits a flat surface with atomic terracing. Remarkably, despite multiple distinct crystal orientations found in the initial islands, the final film is single-crystalline. This is possible due to a reorientation process occurring during island coalescence, facilitating high quality heteroepitaxy despite the large lattice mismatch, difference in crystal structures and diverging thermal expansion coefficients of PbTe and InP. This growth mode offers a new strategy for the heteroepitaxy of dissimilar materials and expands the realm of possible material combinations.
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