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Defect States in Chalcogenide Glasses

The position of the Fermi level is calculated for chalcogenide glasses by using various models for defects. As a result, the observed p-type conduction is found to be explainable, if the defects are positively and negatively charged dangling bonds, and positively charged ones are interacting with neighboring lone pairs, making a weak bond. Further, the photo-induced ESR suggests that neutral defects are not three-fold coordinated chalcogens but dangling bonds.