The invention provides a fabrication method of batch producing nano-scale structures, such as arrays of silicon pillars of high aspect ratio. The invention also relates to providing arrays of high aspect ratio silicon pillars fabricated using the improved fabrication method. The array of silicon pillars is fabricated from arrays of low aspect ratio pyramid-shaped structures. Mask formed from a hard material, such as a metal mask, is formed on top of each of the pyramid-shaped structures in a batch process. The pyramid-shaped structures are subsequently etched to remove substrate materials not protected by the hard masks, so that a high aspect ratio pillar or shaft is formed on the pyramid-shaped low aspect ratio base, resulting in an array of high aspect ratio silicon pillars.