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

Research output: Contribution to journalArticle

4 Citations (Scopus)

Abstract

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.

Original languageEnglish
Article number274618
JournalJournal of Nanomaterials
Volume2012
DOIs
Publication statusPublished - 2012 Aug 17

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Silicon
Light absorption
Nanowires
Annealing
Cooling
Liquid phase epitaxy
Crystallization
Crystal orientation
Gold
Seed
Precipitates
Chemical vapor deposition
Solar cells
Vapors
Heating
Crystals
Liquids
Substrates

All Science Journal Classification (ASJC) codes

  • Materials Science(all)

Cite this

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abstract = "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.",
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A novel method to grow vertically aligned silicon nanowires on SI (111) and their optical absorption. / Ho, Tzuen Wei; Hong, Franklin Chau-Nan.

In: Journal of Nanomaterials, Vol. 2012, 274618, 17.08.2012.

Research output: Contribution to journalArticle

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