from 28 June 2015 to 3 July 2015 (Africa/Johannesburg)
Africa/Johannesburg timezone
SAIP2015 Proceeding published on 17 July 2016
Home > Timetable > Session details > Contribution details
PDF | XML | iCal

Structural and optical properties of silicon nanowires

Presented by Prof. Christopher ARENDSE on 2 Jul 2015 from 17:10 to 17:30
Type: Oral Presentation
Session: Applied
Track: Track F - Applied Physics

Abstract

Silicon nanowires (Si NWs) find application in radial solar cells, mainly due to its excellent anti-reflective properties and improved conductivity. An additional advantage of Si NWs is that the superior material-quality requirement for efficient solar cells can be relaxed, since the required transport length of the minority charge carriers are greatly reduced. In this contribution, we report on the top-down growth of Si NWs by metal-assisted chemical etching with the emphasis on the effect of etching time on its structural and optical properties. A controlled density and diameter of the Si NWs are achievable with this technique, as confirmed with scanning electron microscopy. Changes in the symmetry and position of crystalline silicon transverse optical peak are observed in its vibrational spectra, which find its origin in the evolution of the structural properties. The Si NWs also show an appreciable reduction in its reflectivity as compared to planar Si (100). Support is gratefully acknowledged from the National Science Foundation - DGE-1069091, the National Research Foundation (RSA) - TTK14052167658, 76568 and 92520; and the University of Missouri / University of the Western Cape Linkage Program.

Award

No

Level

N/A

Supervisor

N/A

Paper

No

Permission

Yes

Primary authors

More

Co-authors

More