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Phosphorus and Boron Codoped Colloidal Silicon Nanocrystals with Inorganic Atomic Ligands
journal contribution
posted on 2013-04-04, 00:00 authored by Hiroshi Sugimoto, Minoru Fujii, Kenji Imakita, Shinji Hayashi, Kensuke AkamatsuThe surface structure of P and B
codoped colloidal Si-NCs are studied
by photoluminescence (PL) in hydrofluoric acid (HF) solution and X-ray
photoelectron spectroscopy (XPS). We find that codoped Si-NCs are
much more stable in HF solution than undoped, P-doped, and B-doped
Si-NCs. The PL study combined with XPS results reveal that a high
B concentration layer is formed on the surface of codoped Si-NCs and
the layer acts as a kind of inorganic atomic ligands for Si-NCs. The
high B concentration layer makes Si-NCs hydrophilic and dispersible
in polar liquids. Furthermore, the layer effectively protects Si-NCs
from oxidation in solution and in air.