Abstract
In this paper, the investigation of structural and optical properties of Zn2SnO4 thin films were studied. The films are performed on glass substrates by pulsed laser technique (PLD) using laser Nd: YAG at wavelength of 1064 nm with 800 mj laser energy using repetition rate of 6 Hz. and average 400 laser pulses at room temperature and annealing by tubular quartz furnace at temperature (573,773) K for 2 hours with air. XRD measurements showed that the structure for all samples is polycrystalline with a cubic nanostructure. Surface morphology was studied using scanning electron microscopy SEM and atomic force microscopy AFM. After annealing, the roughness of the surface and the mean grain size were increased. Optical properties as a function to wavelength in the range (300-1100 nm) have been studied. Absorption spectra of Zn2SnO4 thin films showed that absorption decreases with increasing annealing temperature. Direct energy gap for a Zn2SnO4 thin film was increases with increasing temperature for all samples due to crystal growth. The optical properties such as extinction coefficient, refractive index, and dielectric constant were also studied. .
Highlights
Zinc stannate Zn2SnO4, commonly known as zinc tin oxide ZTO, has been confirmed for high electron mobility (10-15 cm2 / V.s)
We can observe that the deposited film has polycrystalline structure, XRD diffraction results at room temperature have two peak located at 2θ values (29.0499, 34.2162) corresponding to (220) and (311) direction respect to Zn2SnO4 crystals. and with annealing at (573,773) K, It shows several Six diffraction peaks at 2θ values of (29.0499o, 34.2162o, 36.1758o, 41.5558o, 54.9881o and 60.3325o)
The full width at half-maximum (FWHM) decrease with increasing annealing temperature indicate on increasing particle size
Summary
Zinc stannate Zn2SnO4, commonly known as zinc tin oxide ZTO, has been confirmed for high electron mobility (10-15 cm2 / V.s). Zn2SnO4 is a n-type transparent conductive oxide with a wide band gap of 3.7 eV [1]. Pulsed laser deposition is defined as a promising method for depositing metal thin films. The thickness of the films can be controlled by controlling the number of pulses [3]. The laser pulse beam is concentrated on the outer surface of the target material. Where the laser is absorbed and leads to rapid evaporation of the target material [4]. We study the structural and optical properties of Zn2SnO4 thin films grown on a glass slide produced by the PLD [5]
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