研究目的
To investigate the light absorbing power of some natural dyes extracted from different plant leaves and fruits and to fabricate dye sensitized solar cells by a simple pressing technique.
研究成果
The study demonstrated that Malabar spinach seeds dye has the greatest potential to be used as a photosensitizer in dye-sensitized solar cells, showing the highest efficiency and best electrical properties among the tested dyes. The smallest crystallite size and optimal inter-planar distance were also observed for the sample with this dye, supporting its superior performance.
研究不足
The study focused on a limited number of natural dyes and their performance in dye-sensitized solar cells. The efficiency achieved is lower than that of silicon-based solar cells, indicating room for improvement in dye selection and cell fabrication techniques.
1：Experimental Design and Method Selection:
The study involved the preparation of titanium dioxide (TiO2) nanocrystalline sol–gel paste and its layering on Indium Tin-Oxide coated glass to fabricate dye-sensitized solar cells. Natural dyes extracted from Malabar spinach seeds, Red spinach, and Pomegranate burgs were used as photosensitizers.
2：Sample Selection and Data Sources:
Three types of natural dyes were extracted from Pomegranate, Malabar spinach seeds, and Red spinach. The dyes were prepared by grinding, soaking, blending, and filtering processes.
3：List of Experimental Equipment and Materials:
TiO2 nanocrystalline grade powder, Indium Tin-Oxide coated glass, LCR meter (Agilent 4263B), SEM instrument (FEI Inspect S 50), X-ray Diffractometer (Bruker’s with Cu-Kα radiation).
4：Experimental Procedures and Operational Workflow:
The TiO2 paste was spread on ITO coated glass using a glass rod by simple pressing technique, heated, soaked in dye solution, and assembled with a counter electrode. Electrical properties were measured, and I-V characteristics were drawn.
5：Data Analysis Methods:
The electrical properties were analyzed using LCR meter, structural properties by XRD, and morphological properties by SEM. The efficiency of the solar cells was calculated based on I-V characteristics.
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