Metal Free Silicon Nanowires

Silicon nanowires are potentially transformative photovoltaic materials. Nanowire arrays are commonly synthesized using metal seeds. The growth process often introduces metal impurities into wires which degrade their electronic properties. We have used a plasma-assisted, vapor-liquid-solid process to grow silicon nanowires using tin seeds.  The tin is etched by the hydrogen plasma while the wires grow, resulting in self terminating wires which are metal free.