Synthesis of Si nanosheets by a chemical vapor deposition process and their blue emissions

Title
Synthesis of Si nanosheets by a chemical vapor deposition process and their blue emissions
Authors
Ungkil KimIlsoo KimYonghee ParkKi-Young LeeSang-Youp Yim박재관Hong-Gyu AhnSeung-Han ParkHeon-Jin Choi
Keywords
silicon; nanosheets; photoluminescence; ultrathin 2D formation; enhanced direct band gap transition
Issue Date
2011-03
Publisher
ACS Nano
Citation
VOL 5, NO 3, 2176-2181
Abstract
We synthesized free-standing Si nanosheets (NSs) with a thickness of about <2 nm using a chemical vapor deposition process and studied their optical properties. The Si NSs were formed by the formation of frameworks first along six different Æ110æ directions normal to [111], its zone axis, and then by filling the spaces between the frameworks along the Æ112æ directions under high flow rate of processing gas. The Si NSs showed blue emission at 435 nm, and absorbance and photoluminescence (PL) excitation measurements indicate that enhanced direct band transition attributes to the emission. Time-resolved PL measurement, which showed PL emission at 435 nm and a radiative lifetime of 1.346 ns, also indicates the enhanced direct band gap transition in these Si NSs. These outcomes indicate that dimensionality of Si nanostructures may affect the band gap transition and, in turn, the optical properties.
URI
http://pubs.kist.re.kr/handle/201004/45615
ISSN
1936-0851
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KIST Publication > Article
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