Segregation Behaviors and Radial Distribution of Dopant Atoms in Silicon Nanowires
- Naoki Fukata ,
- Shinya Ishida ,
- Shigeki Yokono ,
- Ryo Takiguchi ,
- Jun Chen ,
- Takashi Sekiguchi , and
- Kouichi Murakami
Abstract

Gaining an understanding the dynamic behaviors of dopant atoms in silicon nanowires (SiNWs) is the key to achieving low-power and high-speed transistor devices using SiNWs. The segregation behavior of boron (B) and phosphorus (P) atoms in B- and P-doped SiNWs during thermal oxidation was closely observed using B local vibrational peaks and Fano broadening in optical phonon peaks of B-doped SiNWs by micro-Raman scattering. Electron spin resonance (ESR) signals from conduction electrons were used for P-doped SiNWs. Our results showed that B atoms preferentially segregate in the surface oxide layer, whereas P atoms tend to accumulate in the Si region around the interface of SiNWs. The radial distribution of P atoms in SiNWs was also investigated to prove the difference segregation behaviors between of P and B atoms.
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