Thickness dependence of AC conductivity in TlSe thin films

Saglam U., Yakut Ş., Karabak B., Bozoglu D.

CANADIAN JOURNAL OF PHYSICS, cilt.97, sa.11, ss.1182-1184, 2019 (SCI-Expanded) identifier identifier

  • Yayın Türü: Makale / Tam Makale
  • Cilt numarası: 97 Sayı: 11
  • Basım Tarihi: 2019
  • Doi Numarası: 10.1139/cjp-2018-0758
  • Dergi Adı: CANADIAN JOURNAL OF PHYSICS
  • Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Sayfa Sayıları: ss.1182-1184
  • Anahtar Kelimeler: alternative conductivity, thickness dependence, thin films, thalium selenide, AC conductivity, BAND-STRUCTURE, DIELECTRIC FUNCTION, SPECTROSCOPY, SPECTRA
  • İstanbul Üniversitesi Adresli: Evet

Özet

Thalium selenide (TlSe), which has a lattice with tetragonal symmetry, is a member of the A(3)B(6) semiconductor group. The structure of TlSe is defined as chains where atoms inside are bonded with an ionic-covalent bond. TlSe thin films were deposited by thermal evaporation under a high vacuum on glass substrates. The structure of TlSe thin films is amorphous with a tetragonal structure. The AC conductivity measurements were operated via the measurements of capacitance and dielectric dissipation (tan delta) at room temperature. AC conductivity values change between 10(-11) and 10(-6) S/cm at the low-frequency side with decreasing thickness. Two different conduction regions were observed with increasing frequency. The region observed at the low-frequency side can be attributed to the motion of a chain-like part of the lattice, while the region observed at the high-frequency side can be attributed to side groups.