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<p>Herein, sodium tungstate doped PVA composite films are manufactured using spin-coating to investigate the structural and optical properties. The molecular structure of the fabricated films and the utilized PVA and Na<sub>2</sub>WO<sub>4</sub> powder were characterized by FT-IR and XPS, and then the crystal structure was investigated by X-ray diffractometry (XRD). The investigated analyzed cell parameters of Na<sub>2</sub>WO<sub>4</sub> in powder form have a cubic unit cell with a = 9.12974 and space group Fd<InlineEquation ID="IEq1"> <InlineMediaObject> <ImageObject Color="BlackWhite" FileRef="10904_2024_3546_Article_IEq1.gif" Format="GIF" Height="16" Rendition="HTML" Resolution="72" Type="Linedraw" Width="10" /> </InlineMediaObject> <EquationSource Format="TEX">\(\overline{3 }\)</EquationSource> </InlineEquation>m. The optical absorption coefficient based on Transmission and Reflection is evaluated to investigate the optical transition of the fabricated Na<sub>2</sub>WO<sub>4</sub> doped PVA. The absorption coefficient was improved after the additives of Na<sub>2</sub>WO<sub>4</sub> in the ultraviolet region. The characteristic transition of the pure PVA films was indirect, and the Na<sub>2</sub>WO<sub>4</sub> doped PVA films were directly transitioned with different energy gaps (4.660, 3.879 and 4.143 eV). The nonlinear Cauchy and Sellimeier models were used to analyze and simulate observed optical dispersion coefficients. The estimated oscillator energy of 8.575, 6.908, and 6.844&#xa0;eV for the fabricated PVA films was indirect, and the Na<sub>2</sub>WO<sub>4</sub> doped PVA films. Moreover, anomalies hysteric (I–V) cyclic curves are recorded for the Ag/Na<sub>2</sub>WO<sub>4</sub>@PVA(1)/p-Si/Al devices. The fabricated Ag/Na<sub>2</sub>WO<sub>4</sub>@PVA(1)/p-Si/Al devices were examined by oscillating applied potential according to the samples’ conductance and series resistances at different frequencies (f = 5 and 10&#xa0;kHz), and showed a stable window area and three different State-Levels dependent on frequency 5 and 10&#xa0;kHz.</p>

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On the Molecular, Crystal Structure and Optical Properties of Sodium Tungstate Doped PVA Composite Films for Fabrication of Ag/Na2WO4 Doped PVA/p-Si/Al Memory Devices

  • 期刊论文

  • 发表日期：

    2025年3月11日

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  • Yasser T. Alharbi

摘要

Herein, sodium tungstate doped PVA composite films are manufactured using spin-coating to investigate the structural and optical properties. The molecular structure of the fabricated films and the utilized PVA and Na2WO4 powder were characterized by FT-IR and XPS, and then the crystal structure was investigated by X-ray diffractometry (XRD). The investigated analyzed cell parameters of Na2WO4 in powder form have a cubic unit cell with a = 9.12974 and space group Fd \(\overline{3 }\) m. The optical absorption coefficient based on Transmission and Reflection is evaluated to investigate the optical transition of the fabricated Na2WO4 doped PVA. The absorption coefficient was improved after the additives of Na2WO4 in the ultraviolet region. The characteristic transition of the pure PVA films was indirect, and the Na2WO4 doped PVA films were directly transitioned with different energy gaps (4.660, 3.879 and 4.143 eV). The nonlinear Cauchy and Sellimeier models were used to analyze and simulate observed optical dispersion coefficients. The estimated oscillator energy of 8.575, 6.908, and 6.844 eV for the fabricated PVA films was indirect, and the Na2WO4 doped PVA films. Moreover, anomalies hysteric (I–V) cyclic curves are recorded for the Ag/Na2WO4@PVA(1)/p-Si/Al devices. The fabricated Ag/Na2WO4@PVA(1)/p-Si/Al devices were examined by oscillating applied potential according to the samples’ conductance and series resistances at different frequencies (f = 5 and 10 kHz), and showed a stable window area and three different State-Levels dependent on frequency 5 and 10 kHz.