Preparing the way for doping wurtzite silicon nanowires while retaining the phase.

Fabbri, Filippo; Rotunno, Enzo; Lazzarini, Laura; Cavalcoli, Daniela; Castaldini, Antonio; Fukata, Naoki; Sato, Keisuke; Salviati, Giancarlo et al. · Nano Lett · 2013

basic_science · Level V

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Abstract

It is demonstrated that boron-doped nanowires have predominantly long-term stable wurtzite phase while the majority of phosphorus-doped ones present diamond phase. A simplified model based on the different solubility of boron and phosphorus in gold is proposed to explain their diverse effectiveness in retaining the wurtzite phase. The wurtzite nanowires present a direct transition at the Γ point at approximately 1.5 eV while the diamond ones have a predominant emission around 1.1 eV. The aforementioned results are intriguing for innovative solar cell devices.

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