The optical properties of Ag2Te crystals from THz to UV

The optical properties of monoclinic Ag2Te crystals are studied in a wide range (3.7 meV–6.2 eV) of photon energies. The measured reflectivity spectra from THz to UV allow unambiguous a photon energy-dependent complex dielectric function, complex refractive index and absorption coefficient to be obt...

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Bibliographic Details
Published inJournal of alloys and compounds Vol. 725; pp. 433 - 440
Main Authors Yeh, Tien-Tien, Lin, Wen Hao, Tzeng, Wen-Yen, Le, Phuoc Huu, Luo, Chih-Wei, Milenov, Teodor I.
Format Journal Article
LanguageEnglish
Published Lausanne Elsevier B.V 25.11.2017
Elsevier BV
Subjects
Absorptivity
Ag2Te
Band gap
Crystals
Energy measurement
Optical properties
Refractivity
Semiconductors
Silver compounds
Spectroscopy
Tellurides
Spectroscopy
Semiconductors
Optical properties
Ag2Te
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Summary:The optical properties of monoclinic Ag2Te crystals are studied in a wide range (3.7 meV–6.2 eV) of photon energies. The measured reflectivity spectra from THz to UV allow unambiguous a photon energy-dependent complex dielectric function, complex refractive index and absorption coefficient to be obtained. The spectral structure in these optical parameters further indicates the coexistence of an indirect transition with a bandgap energy of about 10 meV and a direct transition with a bandgap energy of about 1.84 eV. •The reflectivity spectra of β-Ag2Te crystals were measured from 3.7 meV to 6.2 eV.•The complex refractive index spectra show n > k at photon energy >33 meV.•An indirect bandgap (∼10 meV) and a direct bandgap (∼1.84 eV) coexist in β-Ag2Te.
ISSN:0925-8388
1873-4669
DOI:10.1016/j.jallcom.2017.07.153