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Optical and Photoelectric Properties of
Non–Crystalline Antimony Chalcogenides
Rubish V.M.
Uzhgorod National University, 54, Voloshin St., Uzhgorod
88000, Ukraine
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The structure, fundamental absorption edge, d. c. and a. c. conductivity
and photoconductivity for Sb-S glasses have been studied. The optical band
gap values have been found to be in the range of 1.52-1.76eV. Structure
of monophase SbxS1-x glasses (0.35 =< x =< 0.45) is predominantly
determined by SbS3 structural units, linked with two-fold coordinated sulfur
atoms. Under the direct current the delocalized state conductivity prevails
in the investigated materials. The sw(T)
and sw(w)
dependences have been interpreted within the framework of the model of
the charged defect centres (D–, D0, D+ and accounted for the combined jumping
charge transfer by bipolarons and polarons between these centres. Photosensitivity
of SbxS1-x glasses lies in 500 - 1200 nm spectral range. The highest photosensitivity
is inherent in the glassy Sb2S3. The nature of the peaks in the photoconductivity
spectra for the glasses has been ascertained.
Keywords: absorption edge, short-range order, conductivity, photoconductivity.
PACS: 73.50.Pz; 73.61.Jc; 78.20.-e
doi 10.3116/16091833/3/3/200/2002 |
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