Fig. 1.

(A) Scanning electron microscope image showing the Si microwire arrays that were grown by VLS process. (B) Optical microscopy image showing a typical Si wire-array substrate embedded with a silver film that had been electrically isolated from the wire-array electrode. (C) Scanning electron microscope image showing the silver film at the base the electrode, with the Ag electrically insulated from the Si microwire arrays by the Al₂O₃ and SiO₂ isolation layers.