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Effect of the Tilt Angle on Antimony in Silicon Implanted Wafers

Claudio, G, Kirkby, K J, Bersani, M, Low, R, Sealy, B J and Gwilliam, R (2004) Effect of the Tilt Angle on Antimony in Silicon Implanted Wafers Journal of Applied Physics, 95 (10). ISSN 00218979

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Abstract

A dose of 5.0x10(14) antimony (Sb+) ions cm(-2) was implanted into silicon wafers at an energy of 70 keV, at different tilt angles (0degrees, 15degrees, 30degrees, 45degrees, and 60degrees). One set of samples was preamorphized with 160 keV germanium (Ge+) ions with a dose of 1x10(15) cm(-2). The second set consisted of implants into single crystal silicon. After implantation the samples were annealed at 700 degreesC for 30 s in a pure nitrogen ambient. Secondary ion mass spectroscopy was performed to evaluate the atomic profile and the retained dose as a function of the tilt angle before and after annealing. Rutherford backscattering spectroscopy and ion channeling measurements were performed to quantify the retained dose and the subtitutional fraction of antimony in the preamorphized and crystalline samples. Hall measurements were performed in order to calculate the proportion of the dopant which was electrically active. It was found that the substitutional fraction was a function of the tilt angle for all of the implanted samples. A correlation was also found between the electrical activation and the subtitutional fraction with the highest electrical activation being found at 15degrees tilt (90% for antimony implants into crystalline silicon) and 0degrees tilt (94% for antimony implants into amorphous silicon). For all implant angles the substitutional fraction and dopant activation was greater for the implants into amorphized silicon than for those into the crystalline phase.

Item Type: Article
Additional Information: Published in <i>Journal of Applied Physics,</i> Vol. 95, Iss. 10. Copyright 2004 American Institute of Physics. Click <a href=http://jap.aip.org/>here</a> to access the journal's website.
Divisions: Faculty of Engineering and Physical Sciences > Electronic Engineering > Advanced Technology Institute > Ion Beam Centre
Depositing User: Mr Adam Field
Date Deposited: 27 May 2010 14:09
Last Modified: 23 Sep 2013 18:28
URI: http://epubs.surrey.ac.uk/id/eprint/458

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