Metal Induced Lateral Crystallization of Amorphous Silicon Nanoribbons for Application in Biosensors


Sun, K., Hakim, M. M. A. and Ashburn, P. (2009) Metal Induced Lateral Crystallization of Amorphous Silicon Nanoribbons for Application in Biosensors. At E-MRS 2009 Spring Meeting, Strasbourg, France, 08 - 12 Jun 2009.

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Description/Abstract

Recently, Si nanowires and micron-wide nanoribbons are gaining much attention for biosensing because they offer real-time, label-free, high sensitivity sensing. Currently Si nanowires are fabricated using CMOS technology, SOI substrates and e-beam lithography, which give high costs. In this paper we investigate a lower cost alternative using TFT technology and study the lateral crystallization of Si nanoribbons for application in Si biosensors. A comparison is made of the crystallization of a-Si on SiO2 and on air for use in top-gate and surround-gate sensors. The crystallization is assessed using Normarski microscopy, planar and cross-sectional SEM and defect etching. The results show better lateral crystallization for Si-on-Air than Si-on-Oxide. For a 10h anneal at 550°C, the crystallization extended 24um for Si-on-Air and 11um for Si-on-SiO2, whilst a 20h anneal at 525°C gives 7.7um and 4.9um respectively. Plan-view SEM images also show slightly lower NiSi2 precipitates in Si-on-Air than Si-on-Oxide. Cross-section SEM images show randomly nucleated grains at the bottom of the crystallized layer, with a density of 1.3/um and 3.2/um for Si-on-Air and Si-on-Oxide, indicating the suppression of random grain nucleation in Si-on-Air samples. These results promise better electrical performance from crystallized Si-on-Air sensors than Si-on-Oxide sensors.

Item Type: Conference or Workshop Item (Speech)
Additional Information: Event Dates: June 8 to 12
Divisions: Faculty of Physical Sciences and Engineering > Electronics and Computer Science > NANO
ePrint ID: 267245
Date Deposited: 01 Apr 2009 16:10
Last Modified: 27 Mar 2014 20:13
Further Information:Google Scholar
URI: http://eprints.soton.ac.uk/id/eprint/267245

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