The paper highlights the enactment of the natural dyes, like purple cabbage, spinach, turmeric and their mixture as a photo-sensitizer, with nanostructured zinc oxide (ZnO) as a photo-anode, based dye-sensitized solar cell (DSSC). The field emission scanning electron microscopic image of ZnO, prepared by chemical bath deposition process, proclaims two different types of morphology, nano-wire and nano-plate shape. The photo sensitizing properties of the natural dyes and their mixed part are explored through FTIR spectra and UV-vis light absorbance characteristics. The FTIR spectra explore the presence of different anchoring chemical groups which confirm the strong anchoring bond with ZnO and enhancement of electron mobility. The diffused reflectance spectra (DRS) of dye-loaded ZnO films incisive the absorption of dye on the mesoporous ZnO surface. The relative energy band positions of individual and mixed dye, yield stable execution of the cell that has been performed through the cyclic voltammeter. The driving force energy requirement for effortless transport of electron from the mixed dye to the conduction band of ZnO is revealed lowers (0.34 eV) as compared to individual dyes. Electrochemical impedance spectroscopy (EIS) analysis has been executed to find the charge transfer resistance, total bulk resistance, recombination loss through Nyquist plots and Bode plots. These characteristics pretense as the mixed dye has an eminent rate of electron transportation and lower recombination loss with longer electron lifetime. The photon to electrical power conversion efficiencies of purple cabbage, spinach, turmeric and their mix dyes are explored as 0.1015%, 0.1312%, 0.3045%, and 0.602%, respectively under same simulated light condition. The mixed dye reveals the stable performance of the cell with the highest conversion efficiency due to the absorption of an extensive range of the solar spectrum and well-suited electrochemical responses.

论文重点介绍了天然染料的形成，如紫甘蓝，菠菜，姜黄及其混合物作为光敏剂，纳米结构的氧化锌（ZnO）作为光阳极，基于染料敏化太阳能电池（DSSC）。通过化学浴沉积工艺制备的ZnO的场发射扫描电子显微图像，宣告了两种不同类型的形态，即纳米线和纳米板状。通过FTIR光谱和紫外可见光吸收特性，探索了天然染料及其混合部分的光敏特性。FTIR光谱探索了不同锚固化学基团的存在，这些化学基团证实了与ZnO的牢固锚固键和电子迁移率的增强。负载染料的ZnO薄膜的漫反射光谱（DRS）决定了染料在中孔ZnO表面的吸收。单个和混合染料的相对能带位置可以稳定地执行通过循环伏安计执行的单元。与单个染料相比，将电子从混合染料毫不费力地传输到ZnO的导带所需的驱动力能量需求降低了（0.34 eV）。进行了电化学阻抗谱（EIS）分析，以通过Nyquist图和Bode图找到电荷转移电阻，总体电阻，重组损失。由于混合染料具有显着的电子传输速率和较低的重组损失，并具有较长的电子寿命，因此这些特征很明显。紫甘蓝，菠菜，姜黄及其混合染料的光子至电能转换效率分别为0.1015％，0.1312％，0.3045％和0.602％，分别在相同的模拟光照条件下。由于吸收了广泛范围的太阳光谱和非常合适的电化学响应，混合染料显示出具有最高转换效率的电池稳定性能。