Structural, optical and photovoltaic properties of V2O5/ZnO and reduced graphene oxide (rGO)-V2O5/ZnO nanocomposite photoanodes for dye-sensitized solar cells

IF 5.5 3区材料科学 Q2 CHEMISTRY, MULTIDISCIPLINARY

Carbon Letters Pub Date : 2023-09-14 DOI:10.1007/s42823-023-00608-x

C. Bhagya Lakshmi, S. Anna Venus, S. Velanganni, A. Muthukrishnaraj, Manikandan Ayyar, Mohamed Henini

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Abstract

Photoanode optimization is a fascinating technique for enlightening the power conversion efficiency (PCE) of dye-sensitized solar cells (DSSCs). In this present study, V₂O₅/ZnO and reduced graphene oxide (rGO)-V₂O₅/ZnO nanocomposites (NCs) were prepared by the solid-state technique and used as photoanodes for DSSCs. A wet chemical technique was implemented to generate individual V₂O₅ and ZnO nanoparticles (NPs). The structural characteristics of the as-synthesized NCs were investigated and confirmed using powder X-ray diffraction (XRD), X-ray photoelectron spectra (XPS), and Scanning electron microscope (SEM) with energy dispersive X-ray (EDX) analysis. The average crystallite size (D) of the as-synthesized V₂O₅/ZnO and rGO-V₂O₅/ZnO NCs was determined by Debye-Scherer’s formula. The bandgap (eV) energy was calculated from Tauc’s plots, and the bonding nature and detection of the excitation of electrons were investigated using the Ultra violet (UV) visible spectra, Fourier Transform infrared (FTIR) and photoluminescence (PL) spectral analysis. Electrical studies like Hall effect analysis and the Nyquist plots are also described. The V₂O₅/ZnO and rGO-V₂O₅/ZnO NCs based DSSCs exhibited 0.64% and 1.27% of PCE and the short circuit current densities and open circuit voltages improved from 7.10 to 11.28 mA/cm² and from 0.57 to 0.68 V, respectively.

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用于染料敏化太阳能电池的 V2O5/ZnO 和还原氧化石墨烯 (rGO) -V2O5/ZnO 纳米复合光阳极的结构、光学和光伏特性

光阳极优化是提高染料敏化太阳能电池（DSSC）功率转换效率（PCE）的一项重要技术。本研究采用固态技术制备了 V2O5/ZnO 和还原氧化石墨烯（rGO）-V2O5/ZnO 纳米复合材料（NC），并将其用作 DSSC 的光阳极。采用湿化学技术生成了单个的 V2O5 和 ZnO 纳米颗粒（NPs）。利用粉末 X 射线衍射 (XRD)、X 射线光电子能谱 (XPS) 和扫描电子显微镜 (SEM) 以及能量色散 X 射线 (EDX) 分析，研究并确认了合成的 NC 的结构特征。用 Debye-Scherer 公式测定了合成的 V2O5/ZnO 和 rGO-V2O5/ZnO NCs 的平均晶粒尺寸（D）。带隙能量（eV）由陶氏图计算得出，并利用紫外可见光谱、傅立叶变换红外光谱和光致发光光谱分析研究了成键性质和电子激发的检测。此外，还介绍了霍尔效应分析和奈奎斯特图等电学研究。基于 V2O5/ZnO 和 rGO-V2O5/ZnO NCs 的 DSSC 的 PCE 分别为 0.64% 和 1.27%，短路电流密度和开路电压分别从 7.10 mA/cm2 和 0.57 V 提高到 11.28 mA/cm2 和 0.68 V。

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来源期刊

Carbon Letters CHEMISTRY, MULTIDISCIPLINARY-MATERIALS SCIENCE, MULTIDISCIPLINARY

CiteScore

7.30

自引率

20.00%

发文量

118

期刊介绍： Carbon Letters aims to be a comprehensive journal with complete coverage of carbon materials and carbon-rich molecules. These materials range from, but are not limited to, diamond and graphite through chars, semicokes, mesophase substances, carbon fibers, carbon nanotubes, graphenes, carbon blacks, activated carbons, pyrolytic carbons, glass-like carbons, etc. Papers on the secondary production of new carbon and composite materials from the above mentioned various carbons are within the scope of the journal. Papers on organic substances, including coals, will be considered only if the research has close relation to the resulting carbon materials. Carbon Letters also seeks to keep abreast of new developments in their specialist fields and to unite in finding alternative energy solutions to current issues such as the greenhouse effect and the depletion of the ozone layer. The renewable energy basics, energy storage and conversion, solar energy, wind energy, water energy, nuclear energy, biomass energy, hydrogen production technology, and other clean energy technologies are also within the scope of the journal. Carbon Letters invites original reports of fundamental research in all branches of the theory and practice of carbon science and technology.