The Charged Defect Exists?
HOKKAIDO UNIV SAPPORO (JAPAN) DEPT OF APPLIED PHYSICS
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The origin of gap states in chalcogenide glasses has been studied on the basis of optical spectra obtained for As2 S3 using photoluminescence, photothermal deflection, and resonant Raman scattering. These results combined with other observations suggest that the weak absorption tail arises from gap states below the conduction band, which are produced by As-As wrong bonds. The bond density is estimated at 1 at., which is much greater than that of the charged defect proposed by Mott et al. These insights imply that, not the charged defect, but the wrong bond governs electronic properties in covalent chalcogenide glasses.
- Ceramics, Refractories and Glass
- Atomic and Molecular Physics and Spectroscopy