Natural dye‐sensitized solar cells (DSSCs) are becoming promising candidates for replacing synthetic dyes. Graphene oxide is prepared from natural graphite flakes by modified Hummers method. A novel graphene oxide/yttrium oxide (GO/Y₂O₃) nanocomposites are prepared by chemical precipitation method. The different concentration of (5:1, 5:2, and 5:3) of yttrium oxide nanoparticles exaggerated on the surface of graphene oxide nanosheets. The prepared nanocomposites are characterized by X‐ray diffraction (XRD), scanning electron microscopy (SEM), high‐resolution transmission electron microscopy (HR‐TEM), energy‐dispersive X‐ray spectroscopy (EDAX), Fourier transform infrared spectroscopy (FT‐IR), Raman scattering spectroscopy and ultraviolet–visible (UV–vis) absorption spectroscopy. The XRD analysis showed that the crystallite size of the GO/Y₂O₃ (5:1, 5:2, and 5:3) is found to be around 23, 25.2, and 26.92 nm. Field emission scanning electron microscopy (FE‐SEM) revealed that the flakes like shaped yttrium oxide nanoparticles are uniformly dispersed on the surface of GO sheets. The UV–vis studies showed that the prepared Jasminoum grandiflorum L (JG) dye belongs to chlorophyll group with the absorption of 4.2 eV. The electrochemical activity of the prepared nanocomposites is investigated by cyclic voltammetry (CV) technique. The power conversion efficiency of prepared sandwich type DSSCs (5:3) is found to be 1.67%.

中文翻译：

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氧化石墨烯/氧化钇纳米复合材料作为天然染料敏化太阳能电池应用的阴极材料的作用

天然染料敏化太阳能电池（DSSC）正在成为替代合成染料的有希望的候选者。氧化石墨烯是采用改良的Hummers方法由天然石墨薄片制成的。新型氧化石墨烯/氧化钇（GO / Y ₂ O ₃纳米复合材料是通过化学沉淀法制备的。在氧化石墨烯纳米片的表面上夸大了不同浓度的（5：1、5：2和5：3）氧化钇纳米粒子。制备的纳米复合材料的特征在于X射线衍射（XRD），扫描电子显微镜（SEM），高分辨率透射电子显微镜（HR‐TEM），能量色散X射线光谱（EDAX），傅立叶变换红外光谱（FT） ‐IR），拉曼散射光谱和紫外可见（UV-vis）吸收光谱。XRD分析表明，GO / Y ₂ O ₃的晶粒尺寸发现（5：1、5：2和5：3）约为23、25.2和26.92 nm。场发射扫描电子显微镜（FE-SEM）显示，薄片状的氧化钇纳米颗粒均匀地分散在GO片的表面上。紫外可见研究表明，所制备的茉莉L（JG）染料属于叶绿素基团，吸收率为4.2 eV。通过循环伏安法（CV）研究了制备的纳米复合材料的电化学活性。发现制备的夹心型DSSC（5：3）的功率转换效率为1.67％。