Photocarrier transport and carrier recombination efficiency in vertically aligned nanowire arrays synthesized via metal-assisted chemical etching

College

College of Science

Department/Unit

Physics

Document Type

Article

Source Title

Applied Physics Express

Volume

6

Publication Date

2013

Abstract

The carrier dynamics and recombination characteristics of vertically aligned silicon nanowires are investigated using terahertz emission and photoluminescence spectroscopy, respectively. It is observed that the presence of pores on the walls in two-step-synthesized silicon nanowires greatly affects the carrier dynamics, compared with nanowires synthesized using a one-step process. These pores become efficient carrier recombination sites wherein carriers are collected upon photoexcitation. Additionally, pores effectively diminish the surface electric field thereby inhibiting the terahertz emission. Finally, nanowire-length-dependent terahertz emission is observed only for the one-step-synthesized nanowires whereas the two-step-synthesized nanowire samples exhibited length dependence of their photoluminescence intensity.

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Disciplines

Physics

Keywords

Nanosilicon; Nanowires; Chemical milling

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