In the present work, Dye-Sensitized Solar Cells (DSSC) were fabricated using fabricated TiO₂ photoanodes and natural dyes (Allamanda Blanchetti (AB) and Allamanda Cathartica (AC)) as the sensitizers. Initially, TiO₂ nanoparticles were synthesized by sol–gel technique and a thin film of TiO₂ was formed on the FTO substrate by Doctor Blade technique. Then, they were annealed at 400, 500, and 600 °C to act as the photoanode. X-ray diffraction analysis shows the prepared samples have tetragonal crystal structure with anatase and rutile phase. The average crystallite size was found to be 10–17 nm when the annealing temperature (T_A) was increased from 400 to 600 °C. From UV–DRS analysis, the percentage of reflectance was found to starts at 315 nm. The bandgap analysis shows the transitions were indirect allowed and the bandgap value decreases from 3.6 to 2.8 eV when the T_A increases from 400 to 600 °C. From the optical absorption spectra, the absorption of dye and dye-sensitized TiO₂ was found to be in the visible region. From PL analysis, the emission peak intensity of Ti⁴⁺ was increasing with decrease in oxygen (O₂⁻) vacancies with T_A increases from 400 to 600 °C was noted. FESEM analysis shows the synthesized particles were spherical and from EDS the presence of Ti and O was confirmed. From FTIR analysis, the functional groups presented in the prepared extracts were confirmed. The Efficiency of DSSC was found to be 1.16 and 0.30% for AB sensitized TiO₂ (400 °C) and AC sensitized TiO₂ (400 °C) as photoanodes. From Electrochemical Impedance Spectroscopic (EIS) analysis, DSSC with AB + TiO₂ shows low charge transfer resistance compared with AC + TiO₂.

中文翻译：

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TiO 2光阳极和天然染料（阿拉曼达·布兰切蒂和阿拉曼达·卡塔尔蒂卡）提取物的表征，用作染料敏化太阳能电池应用的敏化剂

在当前的工作中，使用制造的TiO _2光阳极和天然染料（阿拉曼达·布兰切蒂（AB）和阿拉曼达·凯瑟提卡（AC））作为敏化剂，制造了染料敏化太阳能电池（DSSC）。最初，通过溶胶-凝胶技术合成了TiO ₂纳米颗粒，并通过Doctor Blade技术在FTO基板上形成了TiO ₂薄膜。然后，将它们在400、500和600°C退火以充当光电阳极。X射线衍射分析表明所制备的样品具有带锐钛矿和金红石相的四方晶体结构。当退火温度（T _A）时，平均晶粒尺寸为10–17 nm _。）从400°C升高到600°C。通过UV-DRS分析，发现反射率百分比始于315 nm。带隙分析表明，当T _A从400升高到600°C时，间接允许跃迁，带隙值从3.6降至2.8 eV 。从光吸收光谱，发现染料和染料敏化的TiO ₂的吸收在可见光区域。从PL分析，将Ti的发光峰值强度⁴⁺用减少氧气（O增加₂ ^-空缺与）Ť_甲注意到从400℃上升到600℃。FESEM分析显示合成的颗粒是球形的，从EDS中可以确认Ti和O的存在。通过FTIR分析，确认了制备的提取物中存在的官能团。发现AB敏化的TiO ₂（400°C）和AC敏化的TiO ₂（400°C）作为光阳极，DSSC的效率分别为1.16和0.30％。根据电化学阻抗谱（EIS）分析，与AC + TiO ₂相比，具有AB + TiO _2的DSSC显示出较低的电荷转移电阻。