The optical properties of Ag2Te crystals from THz to UV

Tien Tien Yeh, Wen Hao Lin, Wen Yen Tzeng, Phuoc Huu Le, Chih-Wei Luo*, Teodor I. Milenov

*Corresponding author for this work

Research output: Contribution to journalArticle

2 Scopus citations


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.

Original languageEnglish
Pages (from-to)433-440
Number of pages8
JournalJournal of Alloys and Compounds
StatePublished - 1 Jan 2017


  • AgTe
  • Optical properties
  • Semiconductors
  • Spectroscopy

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