Au-Catalyzed Silicon Nanoneedles Synthesized from Pure Silane Gas at Various RF Powers on Silicon Substrate by VHF-PECVD

作者：Hamidinezhad Habib^*; Wahab Yussof; Othaman Zulkafli; Ismail Abd Khamim

来源：Plasmonics, 2011, 6(4): 791-796.

DOI：10.1007/s11468-011-9266-8

• Silicon nanowire
• VHF-PECVD
• VLS
• Crystal growth
• Nanostructures

Silicon nanonowires (SiNWs) were synthesized with approximately 100 nm/min by very-high-frequency plasma-enhanced chemical vapor deposition method via a vapor-liquid-solid mechanism. Pure silane gas was deposited on Au-coated silicon substrates at various radio frequency (RF) powers varied from 5 to 20 W, keeping other deposition parameters constant. Synthesized SiNWs were needle-like shape with an ultra-sharp tip diameter of about 10 nm and a length about 3 mu m, which differs from the standard cylindrical nanowire produced by similar techniques. Furthermore, it was shown that the average length of nanoneedles augmented with the increase of RF power. High-resolution transition electron microscopy displayed that the nanowires were composed of a crystalline Si core with an amorphous oxide shell. Raman spectroscopy also revealed the presence of crystalline Si in the grown Si nanoneedles.

• 出版日期2011-12