Bulk Crystalline 4H -Silicon through a Metastable Allotropic Transition
Bulk Crystalline 4H -Silicon through a Metastable Allotropic Transition
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块状晶体 4H - 亚稳态同素异形转变硅
DOI：
10.1103/physrevlett.126.215701
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发表时间：
2021
影响因子：
8.6
通讯作者：
Strobel, Timothy A.
中科院分区：
文献类型：
--
作者：
Shiell, Thomas B.;Zhu, Li;Cook, Brenton A.;Bradby, Jodie E.;McCulloch, Dougal G.;Strobel, Timothy A.
我们报道了通过加热单晶同素异形体的亚稳相变来合成大块的、高度定向的、结晶的六方硅()。值得注意的是，生成的微晶与晶体之间存在取向关系，表明两相之间存在结构关系。光学吸收测量表明，在1.2 eV附近有一个间接带隙，这与第一性原理的计算是一致的。与以往只产生纳米无序材料的转变路径不同，亚稳态晶体转变路径为获得块状晶体提供了一条新的途径。
We report the synthesis of bulk, highly oriented, crystallinehexagonal silicon (), through a metastable phase transformation upon heating the single-crystallineallotrope. Remarkably, the resultingcrystallites exhibit an orientation relationship with thecrystals, indicating a structural relationship between the two phases. Optical absorption measurements reveal thatexhibits an indirect band gap near 1.2 eV, in agreement with first principles calculations. The metastable crystalline transition pathway provides a novel route to access bulk crystallinein contrast to previous transformation paths that yield only nanocrystalline-disordered materials.