Abstract
In this work a nano-colloidal suspension is used to prepare Nb2 O5 thin films. The effect of different substrates on structural properties of niobium pentoxide thin film deposited by spin coating technique on silicon and quartz substrates are presented. We observed that the obtained structure is monocline in both substrates. The diffraction peaks in both substrates ensured the successful formation of Nb2 O5 thin films with a clear polymorphous structure. However, the structure became more crystalline with additional distinguished peaks on silicon substrate comparing to quartz substrate. The extracted structural parameters from X-Ray diffraction show that the grain size of the thin films on quartz is smaller than silicon with the values of 16.47 nm and 20.98 nm respectively. The stress measurement records the values of 0.19 and 0.00719 for the thin films deposited on silicon and quartz substrates respectively. Effects of film thickness depicted increment in the absorbance and reduction in the band gap. Energy gaps of 2.7, 2.58 and, 2.5 eV are measured as a result of increasing the film thicknesses of 325, 420 and 450 nm respectively.
Highlights
Niobium pentoxide (Nb2O5) is an n-type semiconductor with a broad band gap of 2.8-3.4 eV [1, 2]
The films were fabricated on quartz and silicon substrates using spin coating method
Structural parameters extracted from X- Ray diffraction showed many niobium oxide phases resulting from the complete dissolved of the raw material in the chemical reaction
Summary
Niobium pentoxide (Nb2O5) is an n-type semiconductor with a broad band gap of 2.8-3.4 eV [1, 2]. It has abundant polymorphic shapes which give height to a pleasant series of structural phases [3] that rely on composition mechanisms, pressure and temperature. It enables existent various physical characteristics like a semiconductor or as a dielectric material, relying on the similarity. An appropriate incorporation of chemical, electronic and optical characteristic produces this oxide which helpful in different applications [6,7,8,9]
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