Synthesis of Si nanosheets by a chemical vapor deposition process and their blue emissions
- Synthesis of Si nanosheets by a chemical vapor deposition process and their blue emissions
- Ungkil Kim; Ilsoo Kim; Yonghee Park; Ki-Young Lee; Sang-Youp Yim; 박재관; Hong-Gyu Ahn; Seung-Han Park; Heon-Jin Choi
- silicon; nanosheets; photoluminescence; ultrathin 2D formation; enhanced direct band gap transition
- Issue Date
- ACS Nano
- VOL 5, NO 3, 2176-2181
- 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 , 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.
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