Synthesis, diffused reflectance and electrical properties of nanocrystalline Fe-doped ZnO via sol–gel calcination technique

Abstract

a b s t r a c tThe nanocrystalline ZnO:Fe semiconductor oxides were successfully synthesized via the sol-gel calcination method. Structural, optical and electrical properties of the investigated samples were characterized by various techniques such as atomic force microscopy (AFM), UV-vis absorption and electrical transport measurements. The optical band gap for undoped ZnO (3.19 eV) decreases (2.75 eV) with increasing Fe-doped ZnO (20%). The temperature dependences of the electrical conductivities of undoped ZnO and Fe-doped ZnO were measured and analyzed by Arrhenius equation. The electrical conductivity of the samples decreases with the increase of Fe doping ratio; hence, the electrical conductivity mechanism is controlled by thermally activated processes. To support the nanostructure of Fe-doped ZnO, AFM micrographs were performed.

Effect of calcination temperature on the structural, optical and magnetic properties of pure and Fe-doped ZnO nanoparticles

“…Lower band gap value (Eg) of pure and doped ZnO sample compared to bulk ZnO (3.39 eV) might be due to the presence of oxygen vacancy defects, which is in good agreement with the Eg value determined in the literature [24,25]. From Table 4 and Table 5, it is seen that the band gap energy decreases with the increase in calcination temperature due to the increase in the particle size as has also been evident from the XRD results.…”

Study of the Diffused Reflectance and Microstructure for the Phase Transformation of KNO3

“…and II, we calculate the absorption index (k) which depends on the diused reectance data from the equation k = αλ/4π [23]. By plotting of the absorption index against wavelength is shown in Fig.…”

Improving the optical and electrical properties of Zinc Oxide thin film by Cupric Oxide dopant

“…ZnO has become one of the most popular materials for electrical and optical applications over the time. It is promising material for many optoelectronic applications such as ultraviolet lasers, light-emitting diodes, p-n junction devices, thinfilm transistor, solar cells, acoustic devices, chemical and biological sensors [12]. In order to obtain better crystallization quality and better optical and electrical properties, researchers have performed doping in metal oxides.…”