Microstructural characterization and optical properties of ZnSe thin films

• Published in: Journal of non-crystalline solids Vol. 352; no. 9-20; pp. 1525 - 1528
• Main Authors: Rusu, G.I., Ciupina, V., Popa, M.E., Prodan, G., Rusu, G.G., Baban, C.
• Format: Journal Article Conference Proceeding
• Language: English
• Published: Amsterdam Elsevier B.V 15.06.2006; Elsevier
• Subjects: Absorption; Atomic force and scanning tunneling microscopy; Condensed matter: electronic structure, electrical, magnetic, and optical properties; Exact sciences and technology; Ii-vi semiconductors; Optical properties and condensed-matter spectroscopy and other interactions of matter with particles and radiation; Optical properties of specific thin films; Physics; STEM/TEM; X-ray diffraction; ZnSe; 61.10.Nz; 68.37.Lp; 78.66.Hf; Absorption; Atomic force and scanning tunneling microscopy; X-ray diffraction; STEM/TEM; 81.15.Ef; ZnSe; Atomic force microscopy; Cubic lattices; Blende structure; Electron diffraction; Polycrystals; Zinc selenides; XRD; Absorption coefficients; Thin films; Energy gap; Physical vapor deposition; Absorption spectra; Scanning transmission electron microscopy; Preferred orientation; Heat treatments; Transmission electron microscopy; Microstructure
• ISSN: 0022-3093; 1873-4812
• DOI: 10.1016/j.jnoncrysol.2006.01.029

Zinc Selenide (ZnSe) thin films (d=0.09–1.25μm) on glass substrates were prepared by physical vapour deposition under vacuum, using the quasi-closed volume technique. X-ray diffraction (XRD) analysis indicated that the samples are polycrystalline, have a cubic (zinc blende) structure and that the crystallites are preferentially oriented with the (111) planes parallel to the substrates. The microstructure of ZnSe films examined by transmission electron microscopy (TEM), including electron diffraction (ED) and high-resolution electron microscopy (HRTEM), confirms the preferential orientation of crystallites. The HRTEM micrographs show that preferred orientation of crystallites, along (111) planes, increases if, after deposition, the samples are subjected to a heat treatment. The spectral dependences of the transmission and absorption coefficients were studied in the range 300–1400nm. The values of the bandgap energy, Eg, calculated from the absorption spectra, ranged between 2.50eV and 2.80eV.