Optical Properties of Polycrystalline Zinc Selenide Thin Films

Abstract

Thin films of ZnSe have been deposited onto glass substrates at 373 K by thermal evaporation technique. The X-ray diffractogram confirmed that ZnSe has cubic type crystal structure. The lattice parameters of thin films are almost matching with the JCPDS 5 - 552 data for Zinc Selenide. The transmittance and reflectance have been measured at normal and near normal incidence, respectively, in the spectral range 200 - 2500 nm. The dependence of absorption coefficient, α in the photon energy have been determined. Analysis of the result showed that films of different thicknesses, direct transition occurs with band gap energies ranges from 2.2 to 2.6 eV. Refractive indices and extinction coefficients have been evaluated in the above spectral range

Study of optical properties of thermally evaporated ZnSe thin films annealed at different pulsed laser powers

“…Many metal ores exist as mono-, di-, tri-or tetrachalcogenides [7]. Metal mono-chalcogenides have the formula ME, where M is a transition metal element and E is a chalcogen element, such as S, Se or Te [3,8].…”

Synthesis and Characterization of Zinc Selenide Thin Films by Vacuum Deposition Technique

“…Thin films of ZnSe were deposited by vacuum deposition technique at the vacuum of ~10-6 Torr using an oil diffusion evaporation unit. In this vacuum deposition unit, there were two pressure gauges, Pirani Gauge which measures low vacuum up to 10 -3 Tor and a very sensitive Penning Ionization Gauge which measures relatively high vacuum from 10 -2 to 10 -6 Torr [7]. The source material ZnSe is in ingot form, a compound of ZnSe is obtained by mixing granule of pure zinc material with pure selenium powder in an equal ratio of their atomic weight at a very high temperature in a quartz glass tube.…”

“…here the materials i.e. pure zinc and selenium are from Sigma Aldrich chemical company of purity 99.999 % [7][8][9]. The uniformly mixed compound of ZnSe was grounded in powdered form and it was evaporated from a molybdenum boat.…”

The Influence of Surface on Scattering of Carriers and Kinetic Effects in n-PbTe Films

“…Він підходить для застосування для інфрачервоних лазерів, оптичних детекторів, а також як термоелектричний матеріал для середньотемпературної області (500 -750) [1,2]. У тонких плівках, завдяки переходу від 3D до 2D матеріалу, виникають нові розмірні ефекти, які виявляються також у профілях термоелектричних параметрів [3].…”

“…У деяких роботах коефіцієнт дзеркального відбивання p для напівпровідникових плівок вважають рівним нулю [3,4]. Проте це не завжди відповідає дійсності.…”