具有可调谐可见光发射的二维生长单晶硅纳米片
Two-Dimensionally Grown Single-Crystal Silicon Nanosheets with Tunable Visible-Light Emissions
作者:Sung Wook Kim;Jaejun Lee;Ji Ho Sung;Dong-jae Seo;Ilsoo Kim;Moon-Ho Jo;Byoung Wook Kwon;Won Kook Choi;Heon-Jin Choi;
关键词:Si nanosheets,2D growth,thickness-dependent photoluminescence,tunable emission
DOI:https://doi.org/10.1021/nn501683f
发表时间:2014年
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摘要
自从发现石墨烯以来,二维(2D)纳米材料的增长引起了极大的关注。然而,原子二维(2D)材料的自发生长仅限于几种层状结构晶体,如石墨烯、MoS2和h-BN,否则就极其困难。在这里,我们报告了气相下立方对称的硅(Si)的二维生长,通过树枝状生长和树枝间充填机制形成了厚度为1到13纳米的硅纳米片(SiNSs)。薄SiNSs在可见光范围内表现出强烈的厚度依赖性光致发光,包括红色、绿色和蓝色(RGB)发射,伴随的带隙能量范围为1.6到3.2电子伏特;这些发射能量大于相同尺寸的Si量子点(SiQDs)的发射能量。我们还证明,在传统的有机发光二极管(OLED)结构中,使用SiNS组装作为活跃发射层可以实现电驱动的白光和蓝光发射。我们观察到的可见光范围内的可调光发射表明了新型二维硅纳米光子学的实际应用。
Abstract
Since the discovery of graphene, growth of two-dimensional (2D) nanomaterials has greatly attracted attention. However, spontaneous growth of atomic two-dimensional (2D) materials is limitedly permitted for several layered-structure crystals, such as graphene, MoS2, and h-BN, and otherwise it is notoriously difficult. Here we report the gas-phase 2D growth of silicon (Si), that is cubic in symmetry, via dendritic growth and an interdendritic filling mechanism and to form Si nanosheets (SiNSs) of 1 to 13 nm in thickness. Thin SiNSs show strong thickness-dependent photoluminescence in visible range including red, green, and blue (RGB) emissions with the associated band gap energies ranging from 1.6 to 3.2 eV; these emission energies were greater than those from Si quantum dots (SiQDs) of the similar sizes. We also demonstrated that electrically driven white, as well as blue, emission in a conventional organic light-emitting diode (OLED) geometry with the SiNS assembly as the active emitting layers. Tunable light emissions in visible range in our observations suggest practical implications for novel 2D Si nanophotonics.
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