Atomically-thin crystalline films and ribbons of bismuth telluride
Atomically-thin crystalline films and ribbons of bismuth telluride
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DOI：
10.1063/1.3280078
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发表时间：
2010-02
影响因子：
4
通讯作者：
D. Teweldebrhan;V. Goyal;Muhammad Rahman;A. A. Balandina-A.
中科院分区：
文献类型：
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作者：
D. Teweldebrhan;V. Goyal;Muhammad Rahman;A. A. Balandina-A.
作者报道了具有几个原子厚度的碲化铋的大面积结晶膜和带的“石墨烯样”剥离。结果表明，Bi_2Te_3晶体可以被机械分离成厚度约为1 nm的Te-Bi-Te-Bi-Te原子五倍结构单元，甚至进一步分离成厚度更小的亚单元。原子级薄膜可以被构造成提供二维量子限制的悬浮晶体带。碲化铋的准二维晶体显示出高的电导率和低的热导率。碲化铋原子层工程的提出开辟了一条新的途径，大大提高热电优值。
The authors report on “graphene-like” exfoliation of the large-area crystalline films and ribbons of bismuth telluride with the thicknesses of a few atoms. It is demonstrated that Bi2Te3 crystal can be mechanically separated into its building blocks—Te–Bi–Te–Bi–Te atomic fivefolds—with the thickness of ∼1 nm and even further—to subunits with smaller thicknesses. The atomically-thin films can be structured into suspended crystalline ribbons providing quantum confinement in two dimensions. The quasi two-dimensional crystals of bismuth telluride revealed high electrical conductivity and low thermal conductivity. The proposed atomic-layer engineering of bismuth telluride opens up a principally new route for drastic enhancement of the thermoelectric figure of merit.