Effect of yttrium(Y) on structural, morphological and transport properties of CdO thin films prepared by spray pyrolysis technique

Abstract

Cadmium oxide (CdO) and yttrium (Y) doped CdO (Y: CdO) thin films have been prepared onto glass substrate at temperature 300 °C by spray pyrolysis technique. The effects of yttrium (Y) doping on the structural, morphology, optical and electrical properties were studied systematically. The X-ray diffraction (XRD) study confirms that CdO films are polycrystalline in nature with cubic structure having lattice parameter of 0.4658 nm. Surface topographic and nano-structural analysis indicates cluster grain size and porosity decreased substantially with increase of yttrium (Y) content in CdO films. The optical transmittance exhibits excellent optical transparency, with an average transmittance of >70% in the visible range for 2 to 4% yttrium (Y) doping. The optical band gap widens in Y: CdO film from 2.24 to 2.62 eV through Burstein- Moss shift. Hall measurement confirms that material is of n type with a minimum resistivity of 4.7 × 10−4 Ω-cm with carrier concentration of 4.2 × 1021 cm−3 were achieved for 2% yttrium (Y) doping.

Improved optoelectronic properties of Yttrium co-doped CdO:Zn thin films fabricated by nebulizer spray pyrolysis method for TCO applications

“…The decrease in lattice constant and unit cell volume values may be attributed to a lower ionic radius of Y (0.9 Å) than Cd (0.95 Å). The observed lattice constant value of4.6574 Å for the CdO:Zn is comparable to the result obtained by Ahmed et al [30] for pure CdO.…”

“…Y-doped ZnO films also show enhanced optical and electrical properties which are intensively studied and presented [26,27]. Thus, Y has gained attraction from various researchers and has extensively studied its effect on electrical resistivity [28], mobility, conductivity [29], structure, morphology, and optical properties of CdO films [30]. Many reports are available in the literature regarding the deposition of undoped and doped CdO films by spray pyrolysis [6,10,31], sol-gel method [2,12,18] etc.…”

The effects of CuO doping on structural, electrical and optical properties of CdO thin films deposited by pulsed laser deposition technique

“…The increase of carrier mobility is ascribed to lower potential barrier height of the grain boundaries which enable the charge carriers to travel easily over the boundaries of the grain, this will increase the carrier mobility. Similar behavior has been observed by [45,46].…”

Synthesis and Characterization of a Nano (CdO)0.94:(In2O3) 0.06 / Si gas Sensor

“…Hall coefficient (R H ), carrier concentration (n H ), carrier conductivity, and Hall mobility (μ H ) were calculated from the measurement of Hall effect for the (CdO) 0.94 :(In 2 O 3 ) 0.06 thin film deposited on a glass substrate. The n H and µ H values for the prepared film were calculated by using the following relations [23]: 2) where e is the electronic charge and σ is film conductivity. Hall measurement showed that the prepared film has a negative Hall coefficient, i.e.…”