A novel method to grow vertically aligned silicon nanowires on SI (111) and their optical absorption

Tzuen Wei Ho, Franklin Chau Nan Hong

研究成果: Article同行評審

7 引文 斯高帕斯(Scopus)

摘要

In this study we grew silicon nanowires (SiNWs) on Si (111) substrate by gold-catalyzed vapor liquid solid (VLS) process using tetrachlorosilane (SiCl4) in a hot-wall chemical vapor deposition reactor. SiNWs with 150-200nm diameters were found to grow along the orientations of all 111 family, including the vertical and the inclined, on Si (111). The effects of various process conditions, including SiCl4 concentration, SiCl 4 feeding temperature, H 2 annealing, and ramp cooling, on the crystal quality and growth orientation of SiNWs, were studied to optimize the growth conditions. Furthermore, a novel method was developed to reliably grow vertically aligned SiNWs on Si (111) utilizing the principle of liquid phase epitaxy (LPE). A ramp-cooling process was employed to slowly precipitate the epitaxial Si seeds on Si (111) after H 2 annealing at 650°C. Then, after heating in SiCl 4/H 2 up to 850°C to grow SiNWs, almost 100 vertically aligned SiNWs could be achieved reproducibly. The high degree of vertical alignment of SiNWs is effective in reducing surface reflection of solar light with the reflectance decreasing with increasing the SiNWs length. The vertically aligned SiNWs have good potentials for solar cells and nano devices.

原文English
文章編號274618
期刊Journal of Nanomaterials
2012
DOIs
出版狀態Published - 2012

All Science Journal Classification (ASJC) codes

  • 材料科學(全部)

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