The Effect of Annealing on the Structural, Electrical and Optical Properties of CdTe Thin Films

Abstract

CdTe Thin films were deposited by thermal evaporation on glass substrates under vacuum of 2×10 -6 mbar. The annealing has been done under vacuum 10 -3 mbar at (303,373,423,473) K annealing temperature. The structure was investigated by XRD technique. It is found that the structure for all samples (as-deposited and annealed) is polycrystalline. The d.c. electrical conductivity was investigated and attributed to two mechanisms. The activation energy Ea increases from 0.13 to 0.55eV as annealing temperature increases from 303 to 473K. The a.c. conductivity reveals that the dependence of activation energy Ew on frequency is larger than that on temperature. Ew increases from 0.11 to 0.18eV as annealing temperature increases from 303 to 473K. Optical studies showed that optical energy gap increases with increasing annealing temperature from 1.4eV at 303K to 2.15eVat 473K.Keyword : CdTe thin films , electrical and optical properties of CdTe thin films.

Depending the Structure and Optical Properties of Cadmium Telluride Films on the Doping process

“…This may be due to improving the crystalline structure after doping with different material. This result agrees approximately with the result reported by [11] [12]. This Figure indicates According to the American standard for testing materials (ASTM) cards.…”

Study of the Topography and Optical Properties of The Silver Nitrate Nanoparticle Compound

“…and figure (4) represents a graph of the granular groups distribution percentages on the surface of the pressed AgNo 3 when 40% and 15% of it distribute between diameters (50-70)nm. and table (1) show diameters and volumes for all diameters showing to them and cumulation we note if increase diameters decrease the volumes and increase cumulations. The optical properties of silver nitrate were studied, including absorbance measurement was conducted within the wavelength range of (260-1100) nm of silver nitrate.…”

“…One of the forms of nanotechnology is Nano composites, which differ in their properties from the original material. One of the analytical methods, and the technologies that used in the study of the properties of Nano substance is the Atomic Force Supply (AFM) to study the topographic of substances surface [1]. Nanosubstances properties are internal granules measurements range from (1 to 100) nm, and 100 nm substances have different properties from the larger dimensional substance and may be organic, inorganic, natural or synthetic and the resistance of the metallic substances increases, and the hardness values increase and the melting degree of the Nanosubstance is less than the basic substance and the magnetic intensity of the substance increases as small as nanoparticles and the electrical capacity in the electrical conductivity increases as small as nanoparticles and more nanoparticles are homogeneous in the same size, the more they interact [2].…”