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Point Defect Characterization of Zn- and Cd-Based Semiconductors Using Positron Annihilation Techniques

Published online by Cambridge University Press:  10 February 2011

G. Tessaro
Affiliation:
Department of Engineering Physics, McMaster University, 1280 Main St. West, L8S 4L7, Hamilton, Ontario
P. Mascher
Affiliation:
Department of Engineering Physics, McMaster University, 1280 Main St. West, L8S 4L7, Hamilton, Ontario
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Abstract

A study of point defects in II-VI compound semiconductors was undertaken and has revealed that open volume defects are present in a wide variety of these samples. Zn-based binary compounds contain primarily neutral divacancy defects in concentrations in the mid 1016 cm−3. CdTe samples contain neutral monovacancy sized defect complexes in the high 1016 cm−3 range. When a small fraction of Zn or Se is alloyed into CdTe the defect profile changes dramatically to one dominated by divacancy sized defects at roughly half the original concentration.

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