Structural, Morphological and Optical Properties of V2O5 Using 20 KeV He+ Ion Implantation

Vandana P, Shah DR, Taparia YA, Kachwala TS, Biswas S and Thakur A

Published on: 2024-10-05

Abstract

This study examines the structural, morphological, and optical modifications that occur in V2O5 thin films as a result of 20 keV He+ implantation at varying fluences. The orthorhombic crystalline structure of the V2O5 thin films is maintained across all ion fluences, as evidenced by X-ray diffraction (XRD) analysis. A modest increase in crystallinity is observed at the highest fluence of 1x10¹? ions/cm², despite a minor reduction in crystallite size. FTIR peaks that are more defined and sharper, particularly for the V=O and V-O-V bonds, are indicative of a more ordered structure, which is consistent with the increased crystallinity. Nevertheless, atomic force microscopy (AFM) demonstrates a counterintuitive trend in surface roughness: an initial increase at 1x10¹² ions/cm², which is likely the result of defect formation, is followed by a decrease at 1x10¹? ions/cm², which suggests densification that further smoothens the surface. The optical band gap of the films is essentially unaffected by varying ion fluence, despite these structural and morphological changes. These findings highlight the complex balance between ion fluence, thermal treatment, and defect formation in tailoring the properties of V2O5 thin films, with implications for their application in electronic and optoelectronic devices.

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Keywords

Nanorods; Organic polymers; Spectrophotometer

Introduction

Vanadium pentoxide (V2O5) thin films have attracted considerable attention in recent years due to their potential applications in optical devices, sensors, and energy storage systems. Research has focused on the ability to modify the structural, optical, and morphological characteristics of V2O5 using different ways, with ion implantation being identified as a highly effective technique. Priya et al. [1] have shown that low-energy nitrogen (N?) ion implantation may be used to precisely adjust the structural and morphological properties of V2O5 thin films, resulting in improved optical and wetting properties. Their research highlighted the benefits of decreasing the optical bandgap of V2O5, hence enhancing its suitability for optical applications. Several researches have investigated the impact of doping and ion implantation on the structural, morphological, compositional, and electrical characteristics of V2O5 thin films [2,3]. These investigations have consistently demonstrated that ion implantation has a substantial impact on the properties of V2O5, thereby affecting its performance in different applications (such as structural, optical, and electrical properties of V2O5 thin films) as evidenced by various studies. Prior studies have shown that ion implantation has a significant effect on the crystal structure and surface morphology of V2O5. These findings emphasise the relevance of ion implantation in improving the properties of the material for certain applications.

Furthermore, the examination of the structure of zinc oxide (ZnO) nanorods that have been implanted with nitrogen ions has yielded valuable information about the alterations caused by the implantation process [4]. The study showed that the bonding lengths of Zn-O pairs were longer than normal and there was an increase in structural disarray. The photoluminescence spectra displayed a shift towards shorter wavelengths and a reduction in the intensity of the primary donor-acceptor transition peak, suggesting alterations in the optical characteristics as a result of ion implantation. Moreover, research on V2O5 nanostructures doped with rare earth elements has documented alterations in shape, a shift towards longer wavelengths in the absorption of ultraviolet light, changes in the emission of light upon excitation, and an improved ability to store charge in secondary lithium-ion batteries [5,6].
V2O5 is commonly used in lithium hybrid organic batteries because of its high specific capacity and thermal stability [7,8]. Combining V2O5 with conducting organic polymers, like polyaniline, has been demonstrated to enhance the capacity for lithium-ion intercalation, prolong the cycle life, and increase conductivity [9]. The structure of the V2O5, which lacks a definite shape, enables more rapid diffusion of lithium ions and improved ability to cycle compared to its crystalline form. In general, the research indicates that ion implantation is an effective technique for altering the characteristics of V2O5 thin films, therefore broadening their potential use in other industries. This study seeks to investigate the structural, optical, and morphological characteristics of ion-implanted V2O5 thin films.