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Issue 13, 2020
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3D microstructure analysis of silicon–boron phosphide mixed nanocrystals

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Abstract

The microstructure of boron (B) and phosphorus (P) codoped silicon (Si) nanocrystals (NCs), cubic boron phosphide (BP) NCs and their mixed NCs (BxSiyPz NCs) has been studied using atom probe tomography (APT), transmission electron microscopy (TEM), and Raman scattering spectroscopy. The BxSiyPz NCs inherit superior properties of B and P codoped Si NCs such as high dispersibility in aqueous media and near infrared (NIR) luminescence and those of cubic BP NCs such as high chemical stability. The microanalyses revealed that BxSiyPz NCs are composed of a crystalline core and an amorphous shell. The core possesses a lattice constant between that of Si (diamond-cubic) and BP (cubic). The amorphous shell is comprised of B, Si and P, though the composition is not uniform and there are local B-rich, Si-rich and P-rich domains connected contiguously. The amorphous shell is proposed to be responsible for their superior chemical properties such as high dispersibility in polar solvents and high resistance to acids, and the crystalline core is responsible for the stable NIR luminescence.

Graphical abstract: 3D microstructure analysis of silicon–boron phosphide mixed nanocrystals

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Supplementary files

Article information


Submitted
05 Feb 2020
Accepted
11 Mar 2020
First published
12 Mar 2020

Nanoscale, 2020,12, 7256-7262
Article type
Paper

3D microstructure analysis of silicon–boron phosphide mixed nanocrystals

K. Nomoto, H. Sugimoto, A. V. Ceguerra, M. Fujii and S. P. Ringer, Nanoscale, 2020, 12, 7256
DOI: 10.1039/D0NR01023E

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