Two-Dimensionally Grown Single-Crystal Silicon Nanosheets with Tunable Visible-Light Emissions

Title
Two-Dimensionally Grown Single-Crystal Silicon Nanosheets with Tunable Visible-Light Emissions
Authors
SungWook KimJaejun LeeJi Ho SungDong-jae SeoIlsoo KimMoon-Ho JoByoungWook Kwon최원국Heon-Jin Choi
Keywords
Electroluminescence; Si nanosheets; RGB; LED; 2D growth; thickness-dependent photoluminescence; tunable emission
Issue Date
2014-07
Publisher
ACS Nano
Citation
VOL 8, NO 7, 6556-6562
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.
URI
http://pubs.kist.re.kr/handle/201004/47960
ISSN
19360851
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KIST Publication > Article
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