异质双晶Zn3P2超晶格纳米线：铟插入在超晶格形成机制中的作用及其光学性质
Heterotwin Zn3P2 superlattice nanowires: the role of indium insertion in the superlattice formation mechanism and their optical properties
摘要：
磷化锌，Zn 3 P2，纳米线构成了下一代太阳能电池的潜在构建块，由于合适的光电性能和地壳中丰富的构成元素的组合。沿着纳米线轴的周期性超结构的产生可以提供额外的机制来调整它们的功能特性。在这里，我们提出的汽-液-固生长的磷化锌超晶格驱动的周期性异晶。这种不常见的平面缺陷涉及在孪晶边界处的Zn与In的交换。我们发现锯齿形超晶格的形成是由液滴的总表面能的降低所驱动的。通过阴极发光测量，异孪晶的化学变化不影响光学性质的均匀性。这里提供的基本理解带来了在纳米线技术中使用II-V族半导体的新观点。
英文摘要：
Zinc phosphide, Zn3P2, nanowires constitute prospective building blocks for next generation solar cells due to the combination of suitable optoelectronic properties and an abundance of the constituting elements in the Earths crust. The generation of periodic superstructures along the nanowire axis could provide an additional mechanism to tune their functional properties. Here we present the vapour-liquid-solid growth of zinc phosphide superlattices driven by periodic heterotwins. This uncommon planar defect involves the exchange of Zn by In at the twinning boundary. We find that the zigzag superlattice formation is driven by reduction of the total surface energy of the liquid droplet. The chemical variation across the heterotwin does not affect the homogeneity of the optical proerties, as measured by cathodoluminescence. The basic understanding provided here brings new perspectives on the use of II-V semiconductors in nanowire technology.
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