OPTICAL AND ELECTRICAL PROPERTIES OF SnO₂ THIN FILM PREPARED USING RTO METHOD

Abstract

Transparent and conducting SnO 2 thin film has been produced on quartz substrate using rapid thermal oxidation of pure Sn in air at different oxidation temperature and oxidation time. The transmittance T in the visible and NIR was investigated, the allowed direct energy gap was determined to be 3.18 eV at optimum condition of 600° and 90 s. The dependence of the resistivity on the film thickness and oxidation time has been studied. The optimum thickness of high transmittance and lowest resistivity is about 150 nm for SnO 2 were ρ = 2 × 10-2Ω cm and T = 88%.

Enhancement of Lithium Niobate nanophotonic structures via spin-coating technique for optical waveguides application

“…This may be due to the increasing of grain size and decreasing thickness. Similar result was also recorded in other work [28]. The values of transmission were about 70-80% with the annealing temperature range of 100 to 600 o C. The deposited samples were white to brown in color and showed high transmittance.…”

Effect of Ar gas on the physical properties of Cadmium Sulfide diode prepared by PL deposition

“…Figure (8) show the conductivity of thin films was changed with the change in Ar gas pressures. The figure reveals that the conductivity of CdS films increase with increasing of deposition pressure and such eternal normally due to the increasing in grain sizes.…”

“…Theoretically, the link between the forward bias V and the current flow via the Schottky barrier junction in thermionic emission [8,25]:…”

“…Figure 7 shows the chancing of electrical conductivity (σ) of CdS thin films with operating temperature. Range of operated temperature is (313-348) K. These findings led to the conclusion that the conductivity of (CdS) these films rises with temperature due to an increase in charge carrier excitation, which will enhance the likelihood of a transition from the valence band to the conduction band [7,8].…”

“…[4]. These films can be used in numerous technologies, such as window layers in solar cells [5], photo sensors [6], transistors [7], diodes [8], , optical waveguides, and non-linear optical devices [9,10], due to their intriguing structural, optical, and electrical properties that are very different from bulk materials. Some of the methods that have been used to create cadmium sulfide films(CdS) such as, thermal vacumm evaporation [11], chemical deposition [12], sputtering [13], thearmal spray pyrolysis [14], and pulsed laser deposition [15][16][17].…”