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Mapping of minority carrier diffusion length and heavy metal contamination with ultimate surface photovoltage method

Published online by Cambridge University Press:  15 July 2004

J. Lagowski ,
A. Aleynikov ,
A. Savtchouk  and
P. Edelman
J. Lagowski
Affiliation:
Semiconductor Diagnostics Inc. 3650 Spectrum Blvd. #130, Tampa, FL 33612, USA
A. Aleynikov
Affiliation:
Semiconductor Diagnostics Inc. 3650 Spectrum Blvd. #130, Tampa, FL 33612, USA
A. Savtchouk
Affiliation:
Semiconductor Diagnostics Inc. 3650 Spectrum Blvd. #130, Tampa, FL 33612, USA
P. Edelman*
Affiliation:
Semiconductor Diagnostics Inc. 3650 Spectrum Blvd. #130, Tampa, FL 33612, USA
*
piotr@sditampa.com
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Abstract

The Ultimate surface photovoltage method of minority carrier diffusion length measurements reffered to as Ultimate SPV, replaces a sequential “one wavelength at a time” approach with simultaneous illumination with the entire set of wavelengths. In this multiwavelength beam, each monochromatic component is chopped with slightly different frequency. This enables simultaneous monitoring of all component SPV signals corresponding to different wavelengths using multi-frequency signal processing. The amplitude and phase of each component signals are then analyzed and used to calculate the diffusion length and surface lifetime. In-flight Ultimate SPV measurement, whereby the wafer continuously moves under SPV probe, is used for fast whole wafer mapping. In addition to speed advantages, Ultimate SPV offers a fundemental accuracy advantage due to elimination of differences in wafer condition during sequential illumination with individual wavelengths. High-speed measurements make it possible to add additional wafer treatments and perform multi-mapping required for separation of Fe and Cu in the silicon bulk. Wafer mapping in time of 2 minutes realized with Ultimate SPV is critical for monitoring of cobalt in silicon.

Keywords

Type
Research Article
Information
The European Physical Journal - Applied Physics , Volume 27 , Issue 1-3: Tenth International Conference on Defects: Recognition, Imaging and Physics in Semiconductors (DRIP X) , July 2004 , pp. 503 - 506
Copyright
© EDP Sciences, 2004

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References

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