Three-Dimensional High-order Nano-rod Formation Using a Hydrogen-assisted Deep Reactive Ion Etching

S. Soleimani, S. Zanganeh, S. Azimi, Z. Sanaee, S. Mohajerzadeh and H. Taghinejad
University of Tehran, IR

Keywords: nano-rods, 3-D features, amorphous silicon

Summary:

We report the formation of three-dimensional nano-sized vertical features on amorphous silicon by means of a hydrogen-assisted deep reactive ion etching. The thickness of amorphous silicon has been varied between 5 and 10 µm. The adhesion quality of relatively thick amorphous Si films has allowed deep micro and nano-machining features on silicon and glass substrates. Apart from optical photo-lithography, high precision nano-sphere colloidal lithography and electron beam lithography has been exploited to realize ultra-small features on the amorphous silicon. Scanning electron microscopy has been extensively used to study the evolution of three-dimensional features. Such 3-D structures are suitable for future MEMS-based devices on glass and silicon substrates.