SIRIS Image of Copper in CdZnTe

This image of Cu concentration in a CdZnTe (CZT) sample shows that Cu was concentrating in a Cd precipitate, which was visible in a microscopic image of the sample. CZT is used in infrared sensors for night vision equipment and high Cu concentration will cause dropouts of pixels.

The SIRIS image area is approximately 100 mm by 100 mm. The Cu concentration at the peak is about 10¹⁷ atoms/cm³. The baseline Cu concentration around the peak is less than 5 x 10¹⁴ atom/cm³. Detecting Cu in CZT is very difficult for SIMS analysis because of interferences at the Cu masses but SIRIS selectively ionizes only the Cu atoms and essentially eliminates interferences.

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Last Modified Aug 25, 2008